P1614 on 2006-2013 Chevrolet Impala: Security System Fault and No-Start Fixes

What's Unique About the 2006-2013 Chevrolet Impala

The ninth-generation Impala uses GM's Passkey III+ (PK3+) immobilizer system. This system is known for being sensitive to voltage drops from a weak battery and for issues with the ignition lock cylinder's internal wiring or Passlock sensor failing over time. Unlike some systems where a simple key replacement is the fix, problems on this Impala often point toward the components in the steering column or the Body Control Module (BCM) itself. The communication breakdown occurs between the key's transponder, the BCM, and the ECM, triggering the no-start condition.

Symptoms You May Notice

• Engine will not crank or cranks but does not start.
• Security indicator light on the dashboard is flashing or stays on solid.
• A "Service Theft Deterrent System" message may appear on the driver information center.
• In some cases, door locks and windows may become inoperative, which can point towards a broader BCM issue.

Most Likely Causes

1. Faulty or Damaged Ignition Key 🔴 High Probability → Shop Ignition Switch The transponder chip embedded in the key head can be damaged from being dropped or from normal wear and tear, preventing it from sending a valid signal.
   How to confirm: Try starting the vehicle with a spare key. If the spare key works, the original key is the problem. This is the most important first step.
   Typical fix: Replace and program the faulty key. This usually requires a professional locksmith or a dealership with the correct programming tools.
   Est. part cost: $75-$200
2. Weak or Dead Vehicle Battery 🟡 Medium Probability → Shop Vehicle Battery Low system voltage during startup can cause communication glitches between the BCM and ECM, leading to a false anti-theft trigger. The sensitive electronics in the Passkey III+ system are particularly susceptible to this.
   How to confirm: Test the battery voltage with a multimeter; it should be above 12.4 volts. Attempt to jump-start the vehicle. If it starts, the battery is the likely culprit.
   Typical fix: Recharge or replace the vehicle's battery.
   Est. part cost: $150-$250
3. Failed Ignition Lock Cylinder / Passlock Sensor 🟡 Medium Probability → Shop Ignition Switch The wires leading from the Passlock sensor within the ignition lock cylinder can break from the repeated rotation of the key, or the sensor itself can fail. This is a very common failure point on GM vehicles of this era.
   How to confirm: If a spare key and a good battery don't solve the issue, and the security relearn procedure fails, the lock cylinder is a strong suspect. Diagnosis involves testing for a signal from the sensor with a multimeter.
   Typical fix: Replace the ignition lock cylinder and perform a 30-minute security relearn procedure.
   Est. part cost: $100-$300
4. Faulty Body Control Module (BCM) ⚪ Low Probability → Shop Body Control Module The BCM is the central hub for the security system. While not as common as key or cylinder failure, internal faults can prevent it from communicating correctly with other modules. Water intrusion or voltage spikes can damage the BCM.
   How to confirm: This requires advanced diagnostics with a scan tool capable of communicating with the BCM to check for internal fault codes and communication status with the ECM. Other seemingly unrelated electrical issues (windows, locks, lights acting erratically) are strong indicators of BCM failure.
   Typical fix: Replace and program the Body Control Module. This must be done by a dealer or a well-equipped independent shop.
   Est. part cost: $300-$600

Rare But Worth Checking

• Wiring Harness Damage: Damage to the wiring between the ignition cylinder, BCM, and ECM can cause an intermittent or total loss of communication. This can be caused by previous repairs, chafing, or rodent damage.
• Radio Frequency (RF) Interference: Aftermarket accessories like remote starters or even other RFID-enabled cards on the same keychain can sometimes interfere with the key's transponder signal being read correctly.

Diagnosis Steps

1. Attempt to start the vehicle with a known-good spare key. If it starts, the primary key is faulty.
2. Check the vehicle battery. Ensure it has a full charge (12.4V+) and that the terminals are clean and tight. A weak battery is a very common cause of this code.
3. If the battery is good and the spare key doesn't work, perform the 30-minute security relearn procedure.
4. a. Turn the key to the 'ON' position (do not start the engine).
5. b. The security light will be on or flashing. Wait for approximately 10 minutes until the light turns off.
6. c. Turn the key to 'OFF' for 20 seconds.
7. d. Repeat steps a-c two more times for a total of three 10-minute cycles.
8. e. After the third cycle, the vehicle should be relearned to the key and start.
🎬 Watch: How to perform this anti-theft system reset
9. If the relearn procedure fails, inspect the wiring around the steering column for any visible damage.
10. If no solution is found, the next step is to test the signal from the ignition lock cylinder's Passlock sensor, which may require professional assistance. Given the high failure rate, many owners proceed with replacing the ignition lock cylinder at this stage.

Parts You'll Likely Need

• Ignition Lock Cylinder with Passlock Sensor (OEM #ACDelco D1462G (GM #15795321)) — This is the most frequent hardware failure point for the GM Passlock system on this vehicle after ruling out key and battery issues.
  Trusted brands: ACDelco, Standard Motor Products (SMP), Dorman (e.g., 924-719)
  OEM price range: $150-$250
  Aftermarket price range: $80-$150
• Transponder Key (OEM #GM #25845353 (PK3+)) — The chip in the key can fail, making it unrecognizable to the car's security system.
  Trusted brands: ACDelco
  OEM price range: $50-$100
  Aftermarket price range: $25-$60

Related Codes That Often Appear With This One

• B2960 — This is a common GM Body Control Module code for 'Security System Sensor Data Incorrect but Valid,' which often points directly to a problem with the Passlock sensor in the ignition lock cylinder.

Technical Service Bulletins (TSBs) & Recalls

• While no TSB is directly for P1614, a related common issue is covered by TSB #06-02-35-009H regarding a clunking noise from the intermediate steering shaft. This is relevant as work in the steering column area for one issue could potentially disturb wiring for the other.

Mechanic-Grade Diagnostic Values

• BCM Ground Voltage Drop — expected: Less than 100 millivolts (0.1V). Failure: A reading significantly higher than 0.1V indicates a poor ground connection, which can cause erratic BCM behavior and communication faults like P1614.
• BCM Sleep Mode Current Draw — expected: 20-50mA. Failure: A draw of 300-500mA or higher after the vehicle has been off for several minutes suggests the BCM is not entering sleep mode correctly, which can cause battery drain and lead to low-voltage communication errors.

Scan Tool Commands That Help

• Tech 2: Theft Module Re-Learn / VTD Re-Learn — This function is used after replacing the BCM, PCM, or Passlock sensor to force the modules to learn the new component's security credentials. It is a faster, tool-driven alternative to the 30-minute manual relearn procedure.
• Tech 2 / GDS2: BCM Programming/RPO Configuration — When installing a new or used BCM, it must be programmed with the vehicle's specific VIN and Regular Production Option (RPO) codes to function correctly. This ensures it knows which features the car has (e.g., remote start, specific lighting).

Wiring & Ground Locations

• BCM (Body Control Module) — Under the driver's side of the dashboard, to the left of the steering column, often above the OBD-II port.. The BCM is the central module for the Passkey III+ security system. All communication regarding the key's validity flows through it. Poor connections or internal faults here are a direct cause of P1614.
• G201 — On the front of the dash, above G202.. This is a primary interior ground point. A loose or corroded G201 can cause a floating ground for the BCM, leading to intermittent and difficult-to-diagnose communication errors and security faults.
• G202 — On the right side of the steering column, below connector X201.. Another critical ground for dash-mounted components, including potentially the BCM or related circuits. Verifying this ground is tight and clean is a key diagnostic step for persistent, unexplained electrical issues.

OEM Part Supersession History

• 88964357, 15216929, 19149940 → 15795321 — Standard part consolidation and potential minor design updates by the manufacturer over the vehicle's lifecycle.
  Heads up: The final part number, 15795321 (also sold as ACDelco D1462G), is the correct service replacement for the entire 2006-2013 model range and related GM vehicles.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• 4T65-E Transmission Failure (Solenoids/Pressure Control) 🔴 High — Common after 80,000 miles, especially on 2006-2011 models. Symptoms include harsh shifting, slipping, or getting stuck in one gear.
• Intermediate Steering Shaft Clunk 🟠 Medium — A very common issue where a clunking or popping noise is heard and felt through the steering wheel during low-speed turns. (Ref: GM TSB #06-02-35-009H)
• HVAC Blend Door Actuator Failure 🟡 Low — Extremely common failure causing a loud clicking or ticking noise from the dashboard and/or inability to control cabin temperature.
• Excessive Oil Consumption (3.5L/3.9L V6) 🟠 Medium — Some owners report higher-than-normal oil consumption, which can be caused by worn piston rings or valve seals.
• Power Steering System Leaks 🟠 Medium — Leaks can develop from the power steering rack (leaking into the boots) or the pump itself, causing a whining noise when turning.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used ignition lock cylinder is a viable option as it is primarily a mechanical part with an integrated sensor. The key is ensuring it comes from a vehicle with reasonable mileage and shows no excessive wear.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Check for smooth key rotation without binding or sticking.
• Inspect the small wires coming from the Passlock sensor for any signs of fraying, pinching, or previous repairs.
• Ensure the electrical connector is free of corrosion or damage.

OEM-only on this vehicle (don't cheap out):

• Body Control Module (BCM)

Aftermarket brands forum-validated for this vehicle:

• ACDelco (OEM)
• Standard Motor Products (SMP)
• Dorman

Brands owners have reported issues with on this vehicle:

• No-name, unbranded ignition lock cylinders from online marketplaces often have higher failure rates and may not perform the security relearn procedure correctly.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• B0000 — Body codes (B-codes) are often associated with P1614 when the Body Control Module (BCM) fails to communicate with the ECM or experiences internal faults.
• U0140 — Lost communication with the Body Control Module; this can occur alongside P1614 if the BCM is faulty or experiencing voltage spikes.
• P0606 — ECM/PCM Processor fault; related because communication glitches between the ECM and BCM regarding anti-theft data can trigger security codes.
• P1631 — Theft Deterrent Start Signal Not Correct; a common companion code in GM Passkey III+ systems when the password exchange between modules fails.

Frequently Asked Questions