OBD-II Code B2190: The Ultimate Manufacturer-Specific Guide

What Does B2190 Mean?

Trouble code B2190 lacks a universal definition and changes meaning based on your vehicle's manufacturer. For Nissan and Infiniti, it indicates a failure in the NATS anti-theft system preventing the engine from starting. For Acura, it signals a passenger-side power window circuit error. For Chevrolet and GMC, it points to a failed power seat switch. For Kia, it flags a critical malfunction within the ABS control unit.

Technical definition: There is no SAE/ISO standard definition for B2190. Known manufacturer definitions include: Nissan/Infiniti: NATS (Nissan Anti-Theft System) Antenna Amplifier Malfunction. | Acura: Front Passenger's Power Window Position Detect Circuit Error. | Chevrolet/GMC: Right Front Passenger Seat Side Support Switch Circuit Failure. | Land Rover: Switch for remote rear passenger window. | Ford: Driver seat backrest autoglide rearward switch circuit short to ground. | Kia: ABS Control Unit Malfunction (part 58920-B2190). | Mazda: PATS Transceiver Signal Not Received.

Can I Drive With B2190?

⚠️Yes, But With Caution. This depends entirely on the manufacturer. For Nissan or Infiniti, driving is risky because an intermittent fault becomes a permanent no-start condition without warning, leaving you stranded. For Acura, GM, or Ford, driving is safe, though a specific power window or seat will not function. For Kia, driving is strongly discouraged; this code indicates a failed ABS module, which dramatically increases stopping distances and collision risk during emergency braking.

Common Causes

• Faulty, Unregistered, or Damaged Intelligent Key (Nissan/Infiniti) (Very Common) — On Nissan and Infiniti vehicles, the most frequent cause is a dead key fob battery, a damaged internal transponder chip, or using a key that lost its programming to the vehicle's immobilizer.
• Faulty NATS Antenna Amplifier (Nissan/Infiniti) (Common) — This small ring around the ignition switch reads the chip in your key. When it fails electronically, it cannot verify the key, preventing the car from starting and logging code B2190.
• Radio Frequency (RF) Interference (Nissan/Infiniti) (Common) — The signal between the Intelligent Key and the NATS antenna is easily disrupted by other electronic keys, fobs, or metallic objects on the same keychain, preventing the key from being read.
• Faulty Power Window Motor or Control Unit (Acura) (Common) — For Acura models, this code triggers when the passenger-side power window motor fails or the Multiplex Integrated Control System (MICS) loses the window's position memory after a battery disconnect.
• Defective Power Seat Switch (Chevrolet/GMC/Ford) (Common) — On applicable GM or Ford vehicles, the internal contacts of the power seat adjustment switch burn out or break, causing that specific seat function to stop working.
• Weak Main Vehicle Battery (All Brands) (Less Common) — A failing 12V vehicle battery causes widespread voltage drops, interrupting communication between modules like the BCM and anti-theft systems, indirectly logging a B2190 code.
• Wiring or Connector Issues (All Brands) (Less Common) — A broken wire or a corroded connector in the affected circuit (inside the door for Acura, under the seat for GM, or at the ignition cylinder for Nissan) interrupts the signal.
• Faulty ABS Control Unit (Kia) (Rare) — On specific 2017-2019 Kia Soul models, B2190 indicates an internal electronic failure of the ABS hydraulic control unit (part 58920-B2190), disabling anti-lock brakes.
🎬 Watch: How to locate and replace the Kia ABS module.
• Faulty Body Control Module (BCM) (Rare) — The BCM is the central computer for body electronics. A BCM failure causes this code, but it is rare and always accompanied by network communication codes like U1000.

Symptoms

• Engine Cranks But Will Not Start (Nissan/Infiniti/Mazda) — The engine turns over but refuses to fire, accompanied by a solid or flashing red security indicator light on the dashboard.
• Intermittent Starting Issues (Nissan/Infiniti/Mazda) — The vehicle fails to start unpredictably. It works perfectly for several trips, then suddenly refuses to start, indicating an early-stage NATS antenna failure or RF interference.
• Power Window Inoperative or Reversing (Acura/Land Rover) — The affected power window fails to move, or the 'auto-up' feature stops working. The window sometimes rolls up and immediately reverses itself.
• Power Seat Adjustment Fails (Chevrolet/GMC/Ford) — Specific power seat adjustments (like moving forward or backward) do not respond when the switch is pressed, while other directions may still work.
• ABS and Traction Control Warning Lights On (Kia) — The ABS and traction control warning lights illuminate permanently on the instrument cluster, indicating disabled safety systems.
• DTC B2190 Stored in Body/ABS Module (scan-tool only — no driver-felt sign) — The code is stored in the memory of the relevant control module (BCM, MPCS, or ABS). It does not trigger the Check Engine Light.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this code.

Common Fixes & Costs

• Replace Intelligent Key Fob Battery (Nissan/Infiniti) — Parts: $5-$15, Labor: $0, ~0.1 hr book time (DIY)
• Replace NATS Antenna Amplifier (Nissan/Infiniti) — Parts: $70-$150, Labor: $100-$175, ~1.2 hr book time (Intermediate)
• Replace Power Seat Switch (Chevrolet/GMC) — Parts: $45-$120, Labor: $50-$75, ~0.8 hr book time (DIY)
• Replace Power Window Motor (Acura) — Parts: $80-$250, Labor: $100-$200, ~1.5 hr book time (Intermediate)
• Program a New Key Fob (Nissan/Infiniti) — Parts: $50-$150, Labor: $75-$250, ~0.8 hr book time (Professional)
• Replace ABS Control Unit (Kia Soul) — Parts: $1150-$1750, Labor: $200-$400, ~2.5 hr book time (Professional)
• Replace and Program Body Control Module (BCM) — Parts: $300-$600, Labor: $150-$400, ~2.0 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: Used parts make sense for simple, non-wear electronic components like a Nissan NATS antenna or a GM power seat switch, where savings are significant and failure rates are low.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Match the OEM part number exactly. Superseded numbers may not be compatible.
• Buy from reputable sellers offering a 30-90 day warranty.
• Avoid parts from flood-damaged vehicles.

Decision logic:

• If The part is a Kia ABS Control Unit → Buy a new OEM part or a professionally remanufactured unit. A used part is risky, may have the same internal defect, and requires VIN programming.
• If The part is a NATS antenna or a power seat/window switch → Buy used. A low-mileage used part provides 80% of the value for 30% of the cost.
• If The part is a Body Control Module (BCM) → Buy new. A used BCM is locked to the donor car's VIN, creating programming challenges that exceed the cost savings.

Warranty tradeoff: Used parts typically have a 30-90 day warranty. New aftermarket parts offer 1-year warranties. New OEM parts carry a 1-year/12,000-mile warranty.

Worst-case if a used part fails: $300-$800. If a used ABS module or BCM fails, you pay diagnostic and labor costs a second time.

What Happens If You Wait — Timeline

1. 0-1 month: Intermittent failure to start requiring 2-3 attempts. The 'KEY' warning light flashes occasionally. (MPG impact: 0%% · Added cost: $0)
2. 1-3 months: Failures become frequent. The car requires 5+ attempts or placing the fob directly in the key slot to start. (MPG impact: 0%% · Added cost: $0)
3. 3+ months: The NATS antenna amplifier fails completely. The vehicle cranks but refuses to start. The vehicle is immobile. (MPG impact: 0%% · Added cost: $100-$300 (for towing))
4. Immediate: The ABS and Traction Control warning lights illuminate. The ABS system is disabled. (MPG impact: 0%% · Added cost: $0)
5. Ongoing: Driving without ABS significantly increases stopping distances, elevating collision risk. (MPG impact: 0%% · Added cost: Potentially thousands in collision damage.)

Cost of Not Fixing It

• Immediate: Nissan/Infiniti: Vehicle refuses to start, leaving you stranded. Kia: Loss of ABS and traction control, increasing collision risk. (Added cost: $100-$300 (for towing))
• Ongoing: Acura/GM/Ford: Inconvenience due to non-functional power window or seat. This is not a safety risk and causes no further damage. (Added cost: $0)
• Long-term: Kia ABS fault: Continued driving with a faulty ABS module leads to further electrical damage within the unit or potential collision costs. (Added cost: $1500+)

Diagnosis Steps

1. Identify Your Vehicle's B2190 Definition
   Confirm what B2190 means for your specific make and model. Search '[Your Car Make/Model] B2190 code' to determine if you are diagnosing an anti-theft, power window, power seat, or ABS issue. All subsequent steps depend on this.
   Tools: Smartphone or Computer
2. Scan for Other Codes
   Check for other body (B), communication (U), or powertrain (P) codes. A U1000 code alongside B2190 on a Nissan points to a failing Body Control Module (BCM). P161x codes confirm the anti-theft system is in lockout mode.
   Tools: OBD-II Scanner (capable of reading 'B' and 'U' codes)
3. Test Key Fob and Isolate from Interference (Nissan/Infiniti)
   Replace the battery in your Intelligent Key fob. If the car still won't start, try your spare key. Remove all other keys, fobs, and electronic devices from the keychain to completely rule out RF interference.
   Tools: Spare Key, Small Flathead Screwdriver, CR2032/CR2025 Battery
4. Perform System Reset (Acura)
   If the code appeared after a battery disconnect, reset the window system: turn the ignition ON, roll the passenger window all the way down while holding the switch, then roll it all the way up and hold the switch for 3 seconds.
   Tools: None
5. Check Fuses First
   Locate the fuse for the affected system (power seats, power windows, BCM/Security, ABS) in your owner's manual. Visually inspect it and replace it if blown.
   Tools: Needlenose Pliers or Fuse Puller
6. Inspect Connectors and Wiring
   Visually inspect the wiring and connectors for the affected component. Check inside the door jamb for broken window wires, under the seat for loose switch connectors, or around the ignition cylinder for damaged NATS wiring.
   Tools: Flashlight
7. Test the Component (Switch/Motor)
   For seat or window issues, test for power at the switch. If 12V enters the switch but 0V exits when pressed, the switch is bad. If 12V reaches the motor but it fails to move, the motor is dead.
   Tools: Digital Multimeter
8. Test NATS Antenna Voltage/Continuity (Nissan/Infiniti)
   At the NATS antenna amplifier connector (M21): Check for battery voltage (~12.6V) between Pin 1 (Power) and ground. Check for continuity (<1.0 Ω) between Pin 3 (Ground) and chassis ground. No voltage points to a blown fuse or wiring fault; good voltage/ground points to a dead antenna.
   Tools: Digital Multimeter (Advanced)
9. Scan Tool Live Data PIDs (Nissan)
   Access the BCM live data and monitor the 'KEY REGIST' PID. Insert a known-good key; the status must change to 'Registered'. If it remains 'Unregistered', the key reading failed. Check 'IMMU' status for 'LOCK' mode.
   Tools: Professional Scan Tool (e.g., Nissan CONSULT) (Advanced)
10. Scope the NATS Antenna Signal (Nissan/Infiniti)
    Connect an oscilloscope to the signal wire of the NATS antenna amplifier. When a key is inserted, a healthy antenna produces a clear sine wave pattern. A flat line confirms a dead amplifier requiring replacement.
    Tools: Oscilloscope (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Vehicle Speed: 0 mph (The fault is logged when the ignition is turned on or during a start attempt.)
• RPM: 0 or cranking speed (For anti-theft related faults (Nissan), the code sets before the engine successfully starts.)
• Ignition Status: ON (The self-diagnostic for the NATS, power window, or seat modules runs when the ignition is switched to the ON position.)

Related Codes

• P1610 - P1615 — These Nissan/Infiniti codes appear with B2190. B2190 is the cause (failed key read), and P161x is the result (immobilizer lock mode). You must fix B2190 first.
• U1000 — A generic CAN communication code. If U1000 appears with B2190 on a Nissan, it strongly suggests a failing Body Control Module (BCM) rather than a simple antenna issue.
• B2177 / B2178 — On Acura vehicles, seeing these codes alongside B2190 suggests a wider problem with the multiplex control system or the driver's master switch panel.
• B1825 — On GM vehicles, B2190 points to a faulty seat switch, while B1825 indicates a failure in the seat position sensor affecting memory functions.

Climate & Environmental Factors

• Cold Weather: Cold temperatures reduce lithium key fob battery power output by up to 30%, causing a previously working fob to fail to communicate with the NATS system.
• Humidity / Moisture: Moisture ingress into the ABS module's Hydraulic Electronic Control Unit (HECU) on Kia models causes electrical shorts that trigger faults and disable the system.

How to Talk to a Mechanic About This Code

Say this: "I have a B2190 code. On my [Nissan], it's causing a no-start, please check the NATS antenna before quoting a BCM. On my [Acura], the passenger window isn't working, please perform the window reset procedure. On my [Kia], the ABS light is on, I need a diagnosis of the ABS module."

This signals to the shop that you understand the code is manufacturer-specific. It prevents them from starting a generic diagnostic and protects you from misdiagnoses, like replacing an expensive BCM when a NATS antenna is the culprit.

Avoid saying:

• 'My car won't start, can you fix it?'
• 'The key light is on.'
• 'Just fix whatever's wrong.'

Questions to ask before authorizing the repair:

• For a Nissan no-start: Did you test the NATS antenna circuit and try a spare key before concluding the BCM is bad?
• For an Acura window: Did the manual window reset procedure fail?
• For a Kia ABS fault: What is the full cost for the replacement ABS module, including programming and brake fluid flush?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: Recommended for Kia ABS module replacement, BCM replacement, or programming new keys from scratch.
  Best for: Complex programming jobs (Kia ABS module, Nissan BCM replacement)., Diagnosing issues requiring manufacturer-specific tools like Nissan CONSULT.
  Downsides: Highest labor rates., May recommend replacing an entire assembly when only one component failed. (Typical cost: +50% vs. baseline)
• Independent Shop: Best fit for most non-programming repairs related to B2190. A good independent shop handles these issues for less than a dealer.
  Best for: Most common B2190 fixes (Nissan NATS antenna, Acura window motor, GM seat switch)., Out-of-warranty vehicles where cost is a major factor.
  Downsides: Diagnostic capabilities vary. Ensure they have a scanner that reads manufacturer-specific body codes. (Typical cost: +0% vs. baseline)
• Chain Shop: AVOID for B2190 diagnosis. They are highly likely to misdiagnose the root cause of a NATS, ABS, or BCM fault.
  Best for: Simple parts replacement like a key fob battery.
  Downsides: Technicians lack experience with complex electrical diagnostics., Unlikely to have advanced scanners needed to diagnose body control or anti-theft issues. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost exceeds 40-50% of the car's private-party value, consider selling or trading it in rather than fixing it.

• Car worth $3000, fix is $2100: Walk away. The repair for the Kia ABS module is 70% of the car's value. It is not an economical repair.
• Car worth $10000, fix is $350: Fix it. A NATS antenna replacement is only 3.5% of the vehicle's value and is necessary for it to run.
• Car worth $4500, fix is $1500: Borderline. A BCM replacement on an older Nissan is 33% of the car's value. Get a second opinion before proceeding.

What Scan Tool You Need for This Code

Minimum: A scanner that reads manufacturer-specific Body (B) codes. B2190 is invisible on basic code readers that only check powertrain (P) codes.

A $20 generic OBD-II scanner shows 'No Codes' for a B2190 fault because it cannot communicate with the Body Control Module (BCM) or ABS module.

Budget: BlueDriver Pro Scan Tool (~$100) — Connects to your smartphone and reads enhanced codes (ABS, BCM) for most major brands, confirming the B2190 code and its location.

Mid-range: Foxwell NT510 Elite (~$180) — Offers dealer-level diagnostics for one specific brand, including reading BCM live data and performing bidirectional tests to pinpoint NATS or power seat failures.

Professional: Autel MaxiCOM MK808S (~$450-600) — Provides full bidirectional control and programming functions required for registering new keys, coding a BCM, or cycling the ABS pump during a brake bleed.

Rent vs buy: Auto parts stores loan advanced scanners, but verify their specific model reads 'B' codes. If you do your own maintenance, buying a BlueDriver or Foxwell NT510 is a worthwhile investment.

How to Clear the Code After You Fix It

1. For Nissan/Infiniti: Insert a known-good registered key. The code will not clear until the system successfully recognizes a valid key.
2. For Acura: Perform the manual power window reset procedure.
3. For all makes: Use a compatible OBD-II scan tool to erase the code from the specific module (BCM, MPCS, ABS).

Drive cycle (~15 minutes): A specific drive cycle is not required. For Nissan, the 'drive cycle' is simply a successful key recognition event. For Kia ABS faults, the light extinguishes after repair and clearing codes if the self-test passes on the next startup.

Readiness monitors affected: None. B2190 is a body (B) code and does not affect emissions readiness monitors.

Watch out for:

• Attempting to clear a Nissan B2190 code with a scanner before resolving the key/antenna issue fails; the code remains 'CURRENT'.
• Replacing an Acura power window motor without performing the reset procedure causes the code to return immediately.

Will This Fail Emissions / State Inspection?

No — by itself this code doesn't fail OBD inspection (but it can keep readiness monitors from setting, which causes a separate fail).

• California: A B2190 code will not cause a smog check failure. California focuses on powertrain (P) codes; body codes are ignored.
• New York: B2190 passes the OBD-II emissions inspection. However, if the fault illuminates the ABS light (Kia), it fails the separate annual safety inspection.
• Texas: B2190 passes the emissions test. However, an illuminated ABS light fails the separate safety portion of the inspection.

Most Commonly Affected Vehicles

• Nissan Altima, Maxima, 370Z, Rogue, Sentra (2006-2020) — Commonly experiences NATS antenna amplifier and key issues. 2007-2012 Altimas frequently require part 28590-EL00A.
• Infiniti G37, JX35, QX60, FX35 (2007-2020) — Prone to B2190 due to faults in the Intelligent Key and NATS components.
• Acura MDX, TL, RDX (2007-2022) — Sets B2190 for power window circuit faults, almost always triggered after a battery replacement.
• GMC Acadia (2007-2017) — Commonly cited for B2190 related to the failure of the 8-way power seat adjustment switch, part number 12451497.
• Chevrolet Traverse, Silverado (2009-2022) — Experiences B2190 due to faulty power seat switches. Newer models may require a seat module software update instead of a part.
• Kia Soul (2017-2019) — On non-turbo models with auto brake, a failure in the ABS Control Unit (part 58920-B2190) logs this code.
• Ford Mustang, Expedition, F-150 (2005-2014) — Points to a driver seat backrest autoglide switch failure, often related to easy-entry/exit functions.
• Mazda 3, 6, CX-5 (2008-2018) — Indicates a fault with the PATS transceiver, functionally identical to Nissan's NATS antenna amplifier.

Manufacturer-Specific Notes

• Nissan / Infiniti: The B2190 code remains 'CURRENT' and cannot be cleared with a scanner until a known-good, registered Intelligent Key is successfully inserted and read by the system.
• Acura / Honda: The B2190 code is routinely triggered simply by disconnecting the vehicle's battery. A manual power window reset procedure is the only fix needed.
• Chevrolet / GMC: On 2021+ models, symptoms identical to a bad seat switch are caused by a software glitch in the Driver Seat Adjuster Memory Module, requiring a dealer reprogram (TSB 21-NA-131).
• Ford: For the 'autoglide' seat switch fault, the problem is often a stretched or pinched wiring harness under the seat causing a short to ground, not the switch itself.

Real Owner Stories

2008 Infiniti G37 with 110K miles - Intermittent No-Start

The car cranked but refused to start unpredictably. The 'NO KEY' icon appeared on the dash even with the key inside.

Outcome: Replacing the NATS Antenna Amplifier ($90 part, 1 hour labor) permanently resolved the intermittent starting issue.

Lesson: An intermittent 'crank-no-start' on a Nissan/Infiniti with B2190 is rarely the starter or main battery. Always check the key fob battery and NATS antenna first.

2007 Acura MDX at 150K miles - The 'Post-Battery-Change' Glitch

Immediately after replacing a dead main car battery, the front passenger power window became completely unresponsive.

Outcome: Following a manual reset procedure (rolling the window down, then up, and holding the switch for 3 seconds) restored functionality and cleared the B2190 code for $0.

Lesson: On Acura/Honda vehicles, B2190 is a 'ghost' code appearing after a power interruption. Always perform the window reset procedure before buying parts.

2012 GMC Acadia with 95K miles - The Misleading Switch

The driver's power seat stopped moving forward and backward. Code B2190 was stored in the Body Control Module.

Outcome: They learned GM seat switches are not universally interchangeable. Purchasing the exact OEM switch for the Acadia (Part #12451497) for $80 fixed the seat.

Lesson: When replacing electronic switches, match the OEM part number exactly. A physically similar part lacks the correct internal circuitry.

How to Prevent This Code From Triggering

• Replace Key Fob Battery Proactively (Every 2 years) — For Nissan/Infiniti, a weak key fob battery is a top cause of B2190. Proactive replacement prevents intermittent no-start issues.
• Isolate Intelligent Key (Daily habit) — Keep your Nissan/Infiniti key separate from other fobs or large metal items to prevent Radio Frequency (RF) interference that blocks the NATS antenna.
• Use a Battery Tender During Storage (When parked for 2+ weeks) — Prevents the main battery from dying, avoiding the subsequent power window memory loss and B2190 code on Acura vehicles.
• Periodically 'Exercise' All Power Functions (Monthly) — Operating all power seat directions and rolling windows up and down keeps contacts clean and prevents mechanisms from seizing.

Frequently Asked Questions

Can I drive my car with a B2190 code?

For Nissan or Infiniti, driving is risky because the anti-theft system fails unpredictably, leaving you stranded. For Acura, GM, or Ford, driving is safe but a window or seat won't work. For Kia, driving is dangerous because ABS functionality is disabled.

My Nissan won't start and shows B2190. Does this mean I need a new steering lock (ESCL)?

Not necessarily. A failed Electronic Steering Column Lock (ESCL) and a B2190 NATS fault share identical no-start symptoms but use different codes. B2190 points specifically to the NATS antenna or key fob, requiring proper diagnosis before replacing expensive steering components.

What is the NATS system on a Nissan?

NATS stands for Nissan Anti-Theft System, an immobilizer that uses a transponder chip inside your key. The NATS antenna amplifier around the ignition reads this chip. If the chip's code matches the Body Control Module, the engine starts.

Should I just replace the BCM if I get a B2190 code on my Nissan?

No, replacing the Body Control Module (BCM) is a last resort. The most common causes for B2190 are a dead key fob battery, RF interference, or a faulty NATS antenna amplifier. Always rule out these cheaper components before authorizing a $600+ BCM replacement.

Why did my Acura's window stop working after I changed the battery?

The power window control unit loses its position memory when the battery is disconnected. Performing a manual window reset procedure restores functionality and clears the B2190 code.

My Nissan won't start and shows B2190. Is it the car battery?

Check your key fob battery first. While a weak main car battery causes various electrical problems, B2190 specifically points to a communication failure between the key and the anti-theft system. If the fob battery is good, suspect the NATS antenna amplifier.

How do I test a power window switch with a multimeter?

Set your multimeter to DC Volts and test the power wire going into the switch with the ignition on; it should read ~12V. Press the switch and test the output wire going to the motor. If you have 12V entering the switch but 0V exiting, the switch is bad.

Can I program a new Nissan key myself to fix the B2190 code?

No. Programming new keys for a Nissan NATS system requires specialized diagnostic tools like the dealership's CONSULT-III or professional locksmith equipment.

Key Takeaways

• Code B2190 lacks a universal OBD-II definition, pointing to Nissan anti-theft failures, Acura power window glitches, GM seat switch defects, or Kia ABS faults depending on your vehicle's make.
• On Nissan and Infiniti vehicles, B2190 triggers a permanent no-start condition requiring a $5 key fob battery replacement or a $150 NATS antenna amplifier repair.
• Acura models log B2190 for passenger power window failures, which you can fix in 30 seconds for $0 by performing a manual window switch reset procedure.
• Chevrolet and GMC owners face B2190 when an 8-way power seat switch fails, requiring a $75 plug-and-play replacement part to restore functionality.
• Kia Soul models (2017-2019) use B2190 to flag a catastrophic ABS control unit failure, demanding an immediate $1,500+ professional replacement to restore safe braking.