AutoCodes – Generic – B0996

B0996 Code - Vehicle Electronic Control Unit VIN Check Error

Quick Answer

After battery power has been restored following a loss of power, the Theft Deterrent Module (TDM) will perform a check on the stored Vehicle Identification Number (VIN). Common causes include Vehicle Identification Number (VIN) Set Up Procedure, Faulty Theft Deterrent Module (TDM), Theft Deterrent Module (TDM) harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B0996 indicates Vehicle Electronic Control Unit VIN Check Error.
Common causes: Common causes include Vehicle Identification Number (VIN) Set Up Procedure, Faulty Theft Deterrent Module (TDM), Theft Deterrent Module (TDM) harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,308

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0996 Description

After battery power has been restored following a loss of power, the Theft Deterrent Module (TDM) will perform a check on the stored Vehicle Identification Number (VIN). If the VIN is CORRECT, the TDM will run the VIN Timer for a programmable length of time, typically 10 minutes. The TDM will send a message via the serial data circuit to the Instrument Panel Cluster (IPC) to illuminate the SECURITY indicator. After the VIN Timer has timed out, the security indicator will turn OFF. If the VIN is INCORRECT, the TDM will send the fuel disable password to the Engine Control Module (ECM), via the serial data circuit. The immobiliser system considers this to be an indication of tampering and will not allow the vehicle to start. The TDM will send a message via the serial data circuit to the IPC to flash the SECURITY indicator.

OBDII Code B0996 - Vehicle Electronic Control Unit VIN Check Error - AutoCodes.com — B0996 Code - Vehicle Electronic Control Unit VIN Check Error

What does this mean?

What are the Possible Causes of the DTC B0996?

Vehicle Identification Number (VIN) Set Up Procedure
Faulty Theft Deterrent Module (TDM)
Theft Deterrent Module (TDM) harness is open or shorted
Theft Deterrent Module (TDM) circuit poor electrical connection

How to Fix the DTC B0996?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0996 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B0996 code?

Need more information on how to fix the B0996 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0996 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0996 Buick — Vehicle Electronic Control Unit VIN Check Error
B0996 Cadillac — Vehicle Electronic Control Unit VIN Check Error
B0996 Chevrolet — Vehicle Electronic Control Unit VIN Check Error
B0996 GMC — Vehicle Electronic Control Unit VIN Check Error

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0996 Code

1. What are the common symptoms of OBDII code B0996 (Vehicle Electronic Control Unit VIN Check Error)?

- The common symptoms include the Check Engine light being illuminated, issues with vehicle performance, and difficulty in starting the vehicle.

2. What are the possible causes of OBDII code B0996?

- The code B0996 can be caused by a faulty Electronic Control Unit (ECU), damaged wiring harnesses, or issues with the VIN information stored in the ECU.

3. How can I diagnose the OBDII code B0996?

- To diagnose code B0996, a professional diagnostic scan tool can be used to retrieve the specific error code and further troubleshoot the ECU and VIN-related components.

4. Can I still drive my vehicle with OBDII code B0996?

- It is not recommended to drive the vehicle with an active B0996 code as it may lead to potential performance issues or further damage to the vehicle's electronic systems.

5. How can I repair OBDII code B0996?

- Repairing code B0996 may involve resetting the ECU, repairing or replacing damaged wiring, reprogramming the VIN information, or replacing the ECU if necessary.

6. Will resetting the ECU clear the OBDII code B0996?

- Resetting the ECU may temporarily clear the code, but if the underlying issue causing code B0996 is not addressed, the code is likely to reappear.

7. Can a DIY enthusiast fix OBDII code B0996?

- While some basic troubleshooting steps can be attempted by DIY enthusiasts, diagnosing and repairing code B0996 may require specialized tools and expertise, best handled by a professional mechanic.

8. How much does it typically cost to repair OBDII code B0996?

- The cost of repairing code B0996 can vary depending on the specific cause of the issue, but it may range from a few hundred dollars for minor repairs to potentially more for ECU replacement.

9. Is OBDII code B0996 a serious issue?

- OBDII code B0996 should be addressed promptly to prevent any potential long-term damage to the vehicle's electronic systems and ensure optimal performance and safety.

10. Can OBDII code B0996 affect vehicle emissions or cause it to fail an emissions test?

- Yes, unresolved issues related to code B0996 can impact vehicle emissions and may cause the vehicle to fail an emissions test. It is recommended to address the code promptly to ensure compliance with emissions regulations.