OBD-II Code B1292: Park Assist Sensor 5 Circuit Failure

What Does B1292 Mean?

B1292 indicates the Park Assist Module (PAM) detected a fault in park assist sensor number 5. This sensor is a small, round disc on your bumper that detects obstacles. When active, the parking aid system shuts down as a safety precaution.

Technical definition: For Chrysler, Dodge, Jeep, and Ram, B1292 is defined as 'PTS Sensor 5-Signal Shape / Waveform Failure' (B1292-25). This means the ultrasonic signal from the sensor is illogical or incorrect. An older, generic definition is 'Battery Power Relay Circuit Failure', but this rarely applies to modern vehicles.

Can I Drive With B1292?

✅Yes. You can safely drive. However, the parking assist system is disabled. The National Safety Council reports tens of thousands of parking lot crashes annually; losing this safety feature increases your risk in low-speed environments.

Common Causes

• Physical Obstruction (Dirt, Ice, Accessories, or Paint) (Very Common) — Dirt, snow, ice, thick paint, or aftermarket accessories (like bull bars or license plate frames) block the sensor's ultrasonic waves. This causes the system to report a B1292-25 waveform fault.
• Faulty Park Assist Sensor (Common) — The sensor fails internally due to constant exposure to weather, vibrations, and road debris impacts.
• Damaged Wiring or Corroded Connector (Common) — The wiring harness connecting the sensor to the control module chafes, pinches, or breaks. Moisture bypassing the weather seal causes connector pins to corrode, 🎬 Watch: A mechanic's guide to diagnosing and replacing faulty sensors. creating high resistance or shorts.
• Software Glitch (Less Common) — A software bug within the Park Assist Module (PAM) incorrectly triggers a B1292 code even when the sensor and wiring are intact. This requires a dealer software update.
• Faulty Park Assist Module (PAM) (Rare) — The main computer module controlling the parking assist system fails. Consider this only after thoroughly testing all sensors and wiring.

Symptoms

• "Service Park Assist System" Message — A warning message appears on your instrument cluster display.
• Parking Assist System is Disabled — The system does not activate when shifting into reverse or driving at low speeds, and the dashboard indicator light stays on or flashes.
• Constant Tone When in Reverse — The system produces a long, steady beep for a few seconds when shifting into reverse, then immediately displays a fault message and shuts down.
• Active or Stored B1292 Code (scan-tool only — no driver-felt sign) — The Park Assist Module (PAM) stores a specific fault code in its memory, readable with a capable OBD-II scanner.

Diagnostic Flowchart

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

Common Fixes & Costs

• Clean the Park Assist Sensor — Parts: $0, Labor: $0, ~0.1 hr book time (DIY)
• Replace the Faulty Park Assist Sensor — Parts: $30-$150, Labor: $75-$150, ~0.8 hr book time (DIY)
  Ram 1500 (2013-2018): OEM Mopar 1EW63TZZAA (Alt: {"brand": "Bosch", "part_number": "0263043552"}, {"brand": "Dorman", "part_number": "684-048"})
  Ram 1500 (2019+): OEM Mopar 6MK25TZZAA (Alt: {"brand": "Dorman", "part_number": "684-126"})
  Jeep Grand Cherokee (2016-2022): OEM Mopar 1TK84TZZAA or 5XG29TZZAA (Alt: {"brand": "TRQ", "part_number": "SNA12147"})
• Repair Damaged Wiring or Connector — Parts: $10-$30, Labor: $150-$300, ~2.0 hr book time (Intermediate)
• Perform a Software Update at the Dealership — Parts: $0, Labor: $150-$200, ~1.0 hr book time (Professional)
• Replace Bumper Wiring Harness — Parts: $70-$200, Labor: $200-$400, ~2.5 hr book time (Professional)
  All affected models: OEM Varies by VIN (Mopar) (Alt: {"brand": "Dorman", "part_number": "Varies"})

DIY vs Professional

• Clean the Park Assist Sensor — Beginner:
• Replace the Faulty Park Assist Sensor — Beginner:
• Repair Damaged Wiring or Connector — Beginner:
• Perform a Software Update at the Dealership — Beginner:
• Replace Bumper Wiring Harness — Beginner:

Used vs. New Parts: Buying Guide

When a used part is worth it: For a common, non-wearable electronic part like a park assist sensor, a used OEM part from a reputable auto recycler is a sensible option for budget-conscious repairs on older vehicles.

Donor-vehicle mileage cap: roughly under 120000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Match the OEM part number exactly; identical-looking sensors are often incompatible.
• Source from a vehicle of a similar model year.
• Inspect the connector pins on the used sensor for corrosion or damage.
• Prefer donors from dry climates to minimize pre-existing corrosion.

Decision logic:

• If The cost of a new OEM sensor is less than $100 → Buy new OEM for guaranteed compatibility and a part warranty.
• If The vehicle is over 10 years old and the budget is tight → A used OEM sensor is a cost-effective choice. Avoid the cheapest aftermarket options due to reliability issues.
• If The repair is being done professionally and includes a labor warranty → Use a new part (OEM or quality aftermarket) to avoid paying for labor twice if a used part fails prematurely.

Warranty tradeoff: Used parts typically come with a 30-90 day warranty covering only the part. New aftermarket parts offer a 1-year to limited lifetime warranty. New OEM parts carry a 1-2 year warranty.

Worst-case if a used part fails: $150-300 if a used part fails after installation, primarily due to repeat diagnostic and installation labor.

What Happens If You Wait — Timeline

1. 0-1 week: The 'Service Park Assist System' message appears, and the system is disabled. The B1292 code is stored in the Park Assist Module (PAM). (MPG impact: 0%% · Added cost: $0)
2. 1 week - 3 months: The system remains disabled. The driver becomes accustomed to parking without the aid, increasing the statistical risk of a low-speed parking lot collision. (MPG impact: 0%% · Added cost: $0)
3. 3-12 months: If the root cause is moisture intrusion, corrosion degrades the connector pins and wires. An intermittent fault becomes a permanent open or short circuit. (MPG impact: 0%% · Added cost: $0-$150 (Increase in labor if wiring repair becomes complex))
4. 12+ months: A minor parking lot accident occurs. Repairing a modern bumper with multiple sensors exceeds $4,500, and an at-fault claim raises insurance premiums by 20-40%. (MPG impact: 0%% · Added cost: $3,500+)

Cost of Not Fixing It

• Immediate: The park assist system is disabled, increasing the risk of a low-speed collision with objects, pedestrians, or other vehicles. (Added cost: N/A)
• Ongoing: Increased likelihood of a parking lot accident. The average insurance claim for a parking lot incident is $3,500, and modern bumpers with sensors cost over $4,500 to repair. (Added cost: $3,500+)
• Long-Term: A single at-fault parking lot accident raises insurance premiums by 20% to 40%, costing hundreds of dollars per year for 3 to 5 years. (Added cost: $400-$1,000 annually)

Diagnosis Steps

1. Read Codes and Check TSBs
   Use an OBD-II scanner to confirm B1292 is active. Note any suffix codes (-11, -12, -13, or -25) as they provide critical diagnostic clues. Search online or call a dealer with your VIN to check for Technical Service Bulletins (TSBs), as a software update is the required fix for certain models.
   Tools: OBD-II Scanner (capable of reading B-codes), Internet access (Beginner)
2. Visually Inspect and Clean Sensor #5
   Locate park assist sensor #5 (on Ram 1500s, it is the front sensor second from the passenger side). Thoroughly clean the face of the sensor with a soft cloth and mild soap to remove dirt, snow, or ice. This resolves the majority of B1292-25 codes.
   Tools: Soft cloth, water, mild soap (Beginner)
3. Perform a 'Listen Test'
   Activate the park assist system (ignition on, car in reverse). Place your ear very close to each bumper sensor. A healthy sensor emits a faint, rapid clicking or buzzing sound. If sensor #5 is silent while others click, the sensor is likely dead.
   Tools: None (Beginner)
4. Perform a Sensor Swap Test
   Swap sensor #5 with an adjacent sensor (#4 or #6). Clear the codes and re-test. If the code changes to B1291 (sensor 4) or B1293 (sensor 6), the sensor is bad. If B1292 returns, the problem is in the wiring or the module.
   Tools: Trim removal tools (Intermediate)
5. Inspect the Wiring and Connector
   If the code did not move with the sensor, inspect the wiring harness going to sensor #5. Look for chafed or broken wires. Disconnect the connector and check for green or white corrosion powder, bent pins, or moisture.
   Tools: Flashlight (Intermediate)
6. Test Sensor Voltage Supply & Ground
   With the sensor #5 connector unplugged and ignition on, use a multimeter to verify a supply voltage of approximately 8.0-8.5V on the power pin. Test the ground circuit by measuring resistance between the ground pin and chassis ground; it must be less than 5.0 ohms.
   Tools: Multimeter, vehicle-specific wiring diagram (Advanced)
7. Test Signal Wire for Shorts and Opens
   With the connector unplugged and ignition off, measure resistance between the signal pin and chassis ground; a reading below 10k ohms confirms a short to ground (B1292-11). Turn ignition on and measure voltage on the signal pin; above 10.0V confirms a short to power (B1292-12). To check for an open circuit (B1292-13), measure resistance from the sensor signal pin to the PAM connector pin; it should be under 1.0 ohm.
   Tools: Multimeter, vehicle-specific wiring diagram (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• System Status: Active (The park assist system is turned on manually or automatically by selecting Reverse gear.)
• Vehicle Speed: < 10 mph (16 km/h) (The system self-tests and operates only at low speeds.)
• Gear Selector: Reverse or Drive (The fault sets when the system is commanded to activate upon shifting into gear.)
• Ignition Status: On / Run (The ignition must be on for the Park Assist Module to perform its self-check.)

Related Codes

• B1292-25 — Indicates 'Signal Shape / Waveform Failure'. The signal from sensor #5 is illogical, proving the fault is a dirty, internally failed, or obstructed sensor rather than a wiring short.
• B1292-11 — Indicates the sensor's signal circuit is shorted to ground, pointing directly to a wiring problem.
• B1292-12 — Indicates the sensor's signal circuit is shorted to battery voltage, caused by a wiring issue or internal sensor failure.
• B1291 / B1293 — Codes for adjacent sensors (#4 and #6). If you swap sensor #5 with #4 and the code changes to B1291, it confirms sensor #5 is permanently failed.
• B1292-13 — Indicates an 'Open Circuit'. There is a break in the wiring for the power, ground, or signal wire, or a completely dead sensor.
• B1292-92 — Indicates 'Performance or Incorrect Operation'. Caused by a loose connector, interference from aftermarket equipment, or an internal sensor issue.

Climate & Environmental Factors

• Cold Climates / Winter Conditions: Snow, ice, and road grime physically block the sensor's ultrasonic waves, triggering a B1292-25 (Waveform Failure) code. This temporary obstruction is the most common winter cause.
• Humid / High-Salt Environments (Rust Belt, Coastal Areas): Moisture and road salt penetrate connector seals, causing copper pins to corrode. This increases electrical resistance, leading to permanent open or short circuits (B1292-11, B1292-13).

How to Talk to a Mechanic About This Code

Say this: "I have a 'Service Park Assist' message and my scanner shows a B1292 code, pointing to sensor 5. I've already cleaned the sensor. I'd like to book a one-hour diagnostic to determine if the fault is the sensor itself or a wiring issue."

This signals you've done basic homework and sets a clear scope for the diagnostic. It steers the mechanic away from a lengthy, open-ended diagnosis and focuses them on the most likely causes.

Avoid saying:

• 'My parking beepers are broken.'
• 'The parking thing is acting up, can you just fix it?'
• 'I think I need a new sensor.'

Questions to ask before authorizing the repair:

• Did you confirm the diagnosis by swapping the sensor with an adjacent one to see if the code moved?
• If the sensor swap didn't move the code, did you test the wiring for power, ground, and signal continuity at the sensor's connector?
• If my vehicle is a 2019-2020 Ram or 2014 Ram/Jeep, did you check if a TSB for a software update applies before replacing parts?
• Can you show me the damaged part or the corrosion on the connector?
• What is the warranty on the new sensor and your labor?

Where to Take It: Dealer vs Independent vs Chain

• Dealer:
  Best for: Vehicles under warranty., Specific models known to need a software update (e.g., 2019-2020 Ram 1500, 2014 Ram/Jeep)., Complex electrical issues where an independent shop has already failed to find the cause.
  Downsides: Highest labor rates, typically 1.5-2x more than independent shops., Defaults to replacing an entire wiring harness instead of repairing a single wire. (Typical cost: +50% vs. baseline)
• Independent Shop: Best fit for most situations. A reputable independent shop easily handles the most common causes for a reasonable price. Go to the dealer only if a known TSB points to a software update.
  Best for: Out-of-warranty vehicles where the cause is likely a bad sensor or simple wiring damage., Owners who want a more personal relationship and direct communication with the technician., Cost-conscious repairs.
  Downsides: Quality and diagnostic capabilities vary widely; look for ASE-certified technicians specializing in electronics., Lacks the specific tools to perform manufacturer software updates. (Typical cost: +0% vs. baseline)
• Chain Shop: Use with caution. Acceptable if you explicitly tell them 'replace park assist sensor #5' and nothing more. AVOID for initial diagnosis.
  Best for: Simple, clear-cut sensor replacement if you have already 100% diagnosed the sensor is bad yourself.
  Downsides: Technician skill in electrical diagnostics is highly variable., Lacks tools to read manufacturer-specific body codes accurately. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost for the B1292 code exceeds 40-50% of your car's private-party value, pause and reconsider. Since this is a non-essential convenience feature, the threshold is lower than for a critical engine repair.

• Car worth $2500, fix is $450: Borderline. The repair is 18% of the car's value. Consider if you plan to keep the car for another year or more. If not, sell it as-is with a minor price reduction.
• Car worth $15000, fix is $450: Fix it. The repair cost is a small fraction (3%) of the vehicle's value and restores an important safety feature.
• Car worth $1800, fix is $800: Walk away. The repair costs 44% of the car's value. It is not economically sensible to fix a non-essential feature for this price.

What Scan Tool You Need for This Code

Minimum: A scanner that reads and clears Body (B) trouble codes from the Park Assist Module (PAM) or Body Control Module (BCM).

A standard $20 engine code reader will NOT see the B1292 code. It only reads Powertrain (P) codes. You will waste time guessing because the tool cannot communicate with the correct computer module.

Budget: Thinkscan Plus S7 or BlueDriver Pro (~$100) — Confirms the B1292 code is active, reads manufacturer-specific suffix codes (-25 or -11), and clears the code from the PAM/BCM after the repair is complete.

Mid-range: Foxwell NT510 Elite or Autel MaxiCOM MK808 (~$200) — Provides all budget functions, plus bidirectional controls. This allows you to command the park assist module to perform self-tests, confirming a fix without extensive driving.

Professional: Launch X431 series or Autel MaxiSys MS906 (~$600-1300) — Offers full, dealer-level diagnostics. Performs module software updates/flashing if you have the subscription, allowing you to perform a TSB fix yourself.

Rent vs buy: Most auto parts store loaner tools are basic engine code readers and will NOT work for this code. Buying a budget scanner with B-code capability is a worthwhile investment.

How to Clear the Code After You Fix It

1. Use an OBD-II scan tool to clear the Body (B) trouble codes.
2. Cycle the ignition off and then on.
3. Activate the park assist system by shifting into reverse or pressing the system button.

Drive cycle (~5 minutes): A complex drive cycle is not required. After clearing the code, start the vehicle and engage the park assist system. Driving slowly forward and backward in an open area allows the module to re-test the sensors and confirm the repair.

Readiness monitors affected: None

Watch out for:

• Replacing the part does not automatically clear the 'Service Park Assist' message; you must manually clear the stored B1292 code with a scan tool.
• Disconnecting the battery is an unreliable method for clearing body codes and erases other electronic module settings.
• If the code immediately returns after clearing, the root cause remains unfixed.

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: This code does NOT cause a smog check failure. Emissions tests focus exclusively on powertrain (P) codes.
• New York: A B1292 code does not cause a failure of the NYS emissions inspection.
• Texas: This code does not cause a failure. Texas OBD-II emissions testing targets emissions control systems, not body control modules.

Most Commonly Affected Vehicles

• Ram 1500 (2013-2020) — Very common issue. Models from 2019-2020 are specifically noted for a software glitch (TSB 08-082-20) that causes this code.
• Ram 2500 / 3500 (2014-2018) — Prone to this code due to sensor obstruction and failure. Early 2014 models require a software update per TSB 08-071-14.
• Jeep Grand Cherokee (2011-2021) — TSB 08-071-14 applies to 2014 models. Repair costs are higher if a dealer is involved, with sensor replacement estimates ranging from $293-$322 for 2017-2021 models.
• Dodge Charger (2011-2014) — Listed in service manuals as a fault for the park assist sensor circuit. Sensors are generally plug-and-play and compatible with front or rear locations.
• Chevrolet / GMC Silverado / Sierra 1500 (2014-2018) — Owners report frequent issues with parking assist sensor failures due to wiring damage behind the bumper or internal sensor faults.
• Ford Explorer / F-150 (2011-2019) — While the code number differs, the symptoms and causes (faulty sensor, corroded pins, damaged harness) are identical on Ford vehicles.
• BMW 3-Series / 5-Series / X-Series (2010-2019) — BMW's Park Distance Control (PDC) system commonly experiences failures. A constant tone followed by system shutdown points to a bad sensor or corroded wiring.
• Hyundai Sonata / Santa Fe (2015-2020) — Diagnosis follows the same pattern: check for obstructions, test the sensor by swapping, and inspect the wiring harness for damage.

Manufacturer-Specific Notes

• Ram / Dodge / Chrysler / Jeep: These brands number front park assist sensors 1 through 6 clockwise, starting from the driver's side front corner. Sensor #5 is the front sensor second from the passenger side.
• Ram: For 2019-2020 Ram 1500s, TSB 08-082-20 addresses a software bug that sets code B1292-25. The fix is a dealer-installed software update, not a new sensor.
• Ram / Jeep: TSB 08-071-14 applies to some 2014 Ram and Jeep Grand Cherokee models for a software issue causing false sensor codes; a PAM software update is the specified repair.
• Chrysler / Dodge / Jeep / Ram: TSB 9003059 explicitly states that for 'Signal Shape / Waveform Failure' codes (B1292-25), the first step is to clean snow, mud, or ice from the sensor face before replacing components.

Real Owner Stories

2019 Ram 1500 with B1292-25

Owner reported the 'Service Park Assist' message appeared intermittently in cold or wet weather.

What they tried:

1. Cleaned all front sensors, which cleared the code temporarily.
2. Performed a sensor swap test between sensor #5 and #6. The code remained B1292, proving the sensor was not the issue.

Outcome: The dealer found TSB 08-082-20 and performed a software update on the Park Assist Module (PAM). The code cleared permanently under warranty.

Lesson: For 2019-2020 Ram 1500s, a software glitch is a known cause for B1292-25. Always check for applicable TSBs before replacing parts.

2016 Jeep Grand Cherokee with B1292

The 'Service Park Assist' warning stayed on, and the system was completely disabled. An AlfaOBD scanner confirmed an active B1292 code.

What they tried:

1. Replaced park assist sensor #5 with a new Mopar part. Cleared the code, but it immediately returned.

Outcome: The owner inspected the wiring harness and found it rubbing against a bumper support bracket, causing a short in the signal wire. Repairing the wire and adding protective loom fixed the issue.

Lesson: If replacing the sensor doesn't fix the code, the problem is in the wiring. A sensor swap test prevents wasting money on unneeded parts.

2015 Ram 2500 with multiple sensor codes (B1292, B128F)

After installing a new aftermarket steel bumper with a push bar, the park assist system immediately faulted.

What they tried:

1. Scanned and found codes for two front sensors, B1292 (sensor #5) and B128F (sensor #2).
2. Cleaned the sensors with no effect.

Outcome: The owner determined the steel bumper's push bar directly obstructed the sensors. The only solutions were removing the bumper or permanently disabling the front sensors.

Lesson: Aftermarket bumpers or accessories cause constant B1292 faults. If the code appears immediately after installing an accessory, it is the root cause.

2012 Ram 1500 with all rear sensors failing

The rear park assist system stopped working, and a scan revealed codes for all four rear sensors shorted to ground.

What they tried:

1. A mechanic replaced the Park Assist Module, which did not solve the problem.
2. Tested the 8-volt supply from the module to the sensors, which was good.
3. A 'listen test' revealed none of the rear sensors were clicking.

Outcome: The technician replaced all four rear sensors with new aftermarket parts, fixing the issue.

Lesson: While rare, multiple sensors can fail simultaneously. If power and ground to the harness are confirmed good, the sensors themselves are the collective problem.

How to Prevent This Code From Triggering

• Regularly Clean Sensors (During every car wash or monthly) — Wiping sensors with mild soap and a soft cloth prevents the buildup of road grime, salt, and wax that obstructs ultrasonic waves and triggers a B1292-25 fault.
• Clear Snow and Ice Promptly (As needed during winter) — Snow and ice are the most common temporary cause of sensor faults. Keeping them clear ensures the system remains operational.
• Apply Dielectric Grease to Connectors (When replacing a sensor or if a connector is exposed) — Dielectric grease on the rubber seal of the sensor's electrical connector keeps moisture and road salt out, preventing pin corrosion.
• Visually Inspect Wiring Harness (Annually or during other under-vehicle service) — Checking the bumper wiring harness for chafing or pinching catches potential issues before a wire breaks and causes a fault.

Frequently Asked Questions

Can I fix code B1292 myself?

Yes. The most common fixes, like cleaning the sensor or replacing it, are simple jobs that take under an hour with basic tools.

How much does it cost to fix B1292?

Cleaning a dirty sensor is free. Replacing a sensor costs $30 to $150 for parts, plus $75 to $150 for labor at an independent shop. Dealership software updates typically cost $150 to $200.

Where is park assist sensor 5 located?

On most Chrysler, Dodge, Jeep, and Ram vehicles, front sensors are numbered 1 to 6 clockwise from the driver's side. Sensor 5 is the front bumper sensor second from the passenger's side.

Do I need to paint a new park assist sensor?

Replacement sensors function perfectly unpainted. If you choose to paint them to match your bumper, apply only a very thin layer. Thick paint obstructs the ultrasonic waves and triggers a malfunction.

Why did the code come back after I replaced the sensor?

The problem is likely in the wiring harness leading to that sensor's location, or your vehicle requires a dealer software update. A low-quality aftermarket sensor can also be faulty out of the box.

Why are all my park assist sensors failing at once?

Simultaneous failure of multiple sensors points to a system-wide problem. This is usually a blown fuse, a damaged main wiring harness, or a faulty Park Assist Module (PAM).

Can a car wash cause a B1292 code?

Yes. High-pressure water forces moisture into the sensor's connector, causing a temporary short. The issue usually resolves itself once the sensor and connector dry out.

Key Takeaways

• Code B1292 isolates a failure specifically to park assist sensor number 5, which is the front sensor second from the passenger side on most Ram and Jeep vehicles.
• Clean the face of sensor number 5 with soap and water before replacing parts, as dirt or ice buildup triggers a B1292-25 waveform failure in 80% of winter cases.
• Swap sensor number 5 with adjacent sensor number 4 or 6; if the trouble code changes to B1291 or B1293, the sensor is permanently failed and requires replacement.
• Read the 2-digit suffix code on your scanner: a '-25' indicates a physical obstruction or software glitch, while '-11', '-12', or '-13' confirms a hard wiring fault like a short or open circuit.