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Engine-Codes – GMC – P129E 2016 GMC Sierra

P129E 2016 GMC Sierra Code - Fuel Pump Driver Control Module Signal Message Counter Incorrect

Quick Answer

The P129E diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Fuel Pump Driver Control Module Signal Message Counter is incorrect. Common causes include Faulty fuel pump driver control module, Damaged wiring or connectors, Malfunctioning fuel pump. 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
P129E 2016 GMC Sierra indicates Fuel Pump Driver Control Module Signal Message Counter Incorrect.
Common causes
Common causes include Faulty fuel pump driver control module, Damaged wiring or connectors, Malfunctioning fuel pump.
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 16, 2024
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Code P129E 2016 GMC Sierra Description

The P129E diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Fuel Pump Driver Control Module Signal Message Counter is incorrect. This code is typically triggered when the Engine Control Module (ECM) detects that the signal message counter from the fuel pump driver control module is not within the expected range. The fuel pump driver control module is responsible for controlling the fuel pump operation, ensuring the proper fuel pressure is maintained for the engine to run smoothly.

OBDII Code P129E 2016 GMC Sierra - Fuel Pump Driver Control Module Signal Message Counter Incorrect
P129E 2016 GMC Sierra Code - Fuel Pump Driver Control Module Signal Message Counter Incorrect

Common Causes of P129E 2016 GMC Sierra

  1. Faulty fuel pump driver control module
  2. Damaged wiring or connectors
  3. Malfunctioning fuel pump
  4. Issues with the Engine Control Module (ECM)
  5. Electrical issues such as a short circuit or open circuit in the system

Symptoms of P129E 2016 GMC Sierra

  1. Hard starting: The vehicle may have difficulty starting or may require multiple attempts to start the engine.
  2. Stalling: The engine may stall unexpectedly while driving or idling.
  3. Rough idling: The engine may run erratically at idle, with fluctuations in RPM.
  4. Engine misfires: The engine may misfire, causing rough running and potential loss of power.
  5. Reduced fuel efficiency: The vehicle may experience decreased fuel efficiency due to improper fuel delivery.

How to Fix P129E 2016 GMC Sierra

  1. Diagnose the code using a scan tool to determine the exact cause of the issue.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
  3. Test the fuel pump driver control module and fuel pump for proper operation, replacing any faulty components.
  4. Clear the code from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the code persists, further diagnosis may be necessary to identify any underlying issues that were not initially detected.

Cost to Fix P129E 2016 GMC Sierra

The typical repair costs for addressing a P129E code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this code can range from $200 to $500, including parts and labor. It's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate before proceeding with 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 P129E 2016 GMC Sierra Code

1. What does the OBDII code P129E mean on a 2016 GMC Sierra?

P129E indicates that the Fuel Pump Driver Control Module (FPCM) has detected an incorrect signal message counter, which suggests a communication issue or a malfunction in the module.

2. What are the common symptoms of code P129E on a 2016 GMC Sierra?

Symptoms may include difficulty starting the engine, reduced engine performance, stalling, or an illuminated check engine light.

3. What causes the P129E code on a 2016 GMC Sierra?

Common causes include a faulty Fuel Pump Driver Control Module (FPCM), damaged wiring or connectors, a software issue, or a problem with the fuel pump itself.

4. How can I diagnose the P129E code on my 2016 GMC Sierra?

Start by checking the wiring and connectors to the Fuel Pump Driver Control Module for damage or corrosion. Use a scan tool to verify communication with the FPCM and check for related codes.

5. Can a bad fuel pump cause the P129E code?

While the fuel pump itself is not the typical cause, issues with the fuel pump can indirectly contribute to the code if they affect the FPCM's operation.

6. Is it safe to drive my 2016 GMC Sierra with the P129E code?

Driving with the P129E code may lead to reduced performance or stalling, which could be unsafe. It's best to address the issue as soon as possible.

7. How do I fix the P129E code on a 2016 GMC Sierra?

Repairs may involve replacing the Fuel Pump Driver Control Module, repairing or replacing damaged wiring or connectors, or updating the module’s software if a programming issue exists.

8. How much does it cost to repair the P129E code on a 2016 GMC Sierra?

Repair costs vary but typically range from $200 to $600, depending on whether the FPCM needs replacement or if wiring repairs are required.

9. Can updating the software fix the P129E code?

In some cases, a software update for the Fuel Pump Driver Control Module may resolve the issue if it's caused by a programming error.

10. Do I need professional help to resolve the P129E code on my 2016 GMC Sierra?

While basic checks like inspecting wiring can be done at home, diagnosing and repairing the FPCM or performing software updates typically require professional tools and expertise.

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