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Engine-Codes – Generic – B2139

B2139 Code - Data Mismatch PCM And PATS

Quick Answer

The B2139 diagnostic trouble code (DTC) refers to a "Data Mismatch PCM And PATS" error. Common causes include Faulty wiring or connectors, Malfunctioning PCM or PATS module, Disconnected or damaged component. 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
B2139 indicates Data Mismatch PCM And PATS.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning PCM or PATS module, Disconnected or damaged component.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code B2139 Description

The B2139 diagnostic trouble code (DTC) refers to a "Data Mismatch PCM And PATS" error. In simpler terms, this code indicates that there is a communication issue between the Powertrain Control Module (PCM) and the Passive Anti-Theft System (PATS) in the vehicle. The PCM is responsible for managing the engine's functions, while the PATS is designed to prevent unauthorized access to the vehicle. When these two systems fail to communicate properly, it can lead to various performance issues and potentially leave the vehicle vulnerable to theft.

OBDII Code B2139 - Data Mismatch PCM And PATS
B2139 Code - Data Mismatch PCM And PATS

Common Causes of B2139

  1. Faulty wiring or connectors
  2. Malfunctioning PCM or PATS module
  3. Disconnected or damaged component
  4. Software glitch or communication error
  5. Aftermarket modifications interfering with the PCM/PATS communication

Symptoms of B2139

  1. Difficulty starting the vehicle
  2. Engine stalling or rough idling
  3. Inability to start the engine
  4. Illumination of the security light on the dashboard
  5. Loss of power or drivability issues

How to Fix B2139

  1. Perform a thorough inspection of the wiring and connectors between the PCM and PATS modules.
  2. Check for any loose or damaged components and repair or replace as needed.
  3. Use a diagnostic scanner to reset the codes and reprogram the PCM and PATS modules if necessary.
  4. Test the vehicle to ensure that the PCM and PATS systems are communicating correctly and that the issue has been resolved.
  5. If the problem persists, consider seeking professional assistance from a certified mechanic or dealership to diagnose and repair the underlying cause.

Cost to Fix B2139

The cost of repairing a B2139 code can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate. Additionally, factors such as the make and model of the vehicle, as well as the location of the repair shop, can impact the overall cost of the repair.

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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 B2139 Code

1. What are the common symptoms of OBDII code B2139 (Data Mismatch PCM And PATS)?

- Common symptoms include engine stalling, difficulty starting the vehicle, and the security light flashing on the dashboard.

2. What can cause the OBDII code B2139 to trigger?

- This code is typically triggered by a communication error between the Powertrain Control Module (PCM) and the Passive Anti-Theft System (PATS).

3. How can I diagnose the cause of OBDII code B2139?

- Diagnosis involves checking the wiring connections between the PCM and PATS, inspecting for damaged wiring, and verifying the programming of both modules.

4. What are some possible repair tips for fixing OBDII code B2139?

- Repair tips include ensuring all wiring connections are secure, repairing any damaged wiring, and reprogramming the PCM and PATS if necessary.

5. Can OBDII code B2139 be fixed without professional help?

- While some DIY enthusiasts may attempt to fix this code, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Is it safe to continue driving with OBDII code B2139 active?

- It is not recommended to drive with this code active, as it can lead to potential issues with starting the vehicle and may result in unexpected stalling.

7. How much does it typically cost to repair OBDII code B2139?

- Repair costs can vary depending on the extent of the issue, but expect to pay for diagnostic time, potential wiring repairs, and module reprogramming.

8. Can a low battery voltage cause OBDII code B2139 to trigger?

- Yes, a low battery voltage can sometimes lead to communication errors between the PCM and PATS, triggering the B2139 code.

9. Will resetting the PCM clear OBDII code B2139?

- Resetting the PCM may temporarily clear the code, but it is important to diagnose and repair the underlying issue to prevent the code from recurring.

10. How long does it typically take to repair OBDII code B2139?

- The repair time can vary based on the complexity of the issue, but most experienced mechanics can diagnose and fix the problem within a few hours to a day.

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