P129B GMC Code - Fuel Pump Driver Control Module System Voltage Low
Quick Answer
The Fuel Pump Power Control Module monitors the battery positive voltage circuit to verify the voltage is within the normal operating range. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module circuit poor electrical connection. 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
- P129B GMC indicates Fuel Pump Driver Control Module System Voltage Low.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module circuit poor electrical connection.
- 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.
Code P129B GMC Description
What are the Possible Causes of the DTC P129B GMC?
- Faulty Fuel Pump Driver Control Module
- Fuel Pump Driver Control Module harness is open or shorted
- Fuel Pump Driver Control Module circuit poor electrical connection
How to Fix the DTC P129B GMC?
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 P129B GMC 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.
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Need Help with the Code?
Get the P129B GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P129B 2014 GMC Sierra — Fuel Pump Driver Control Module System Voltage Low
- P129B 2015 GMC Sierra — Fuel Pump Driver Control Module System Voltage Low
- P129B 2016 GMC Sierra — Fuel Pump Driver Control Module System Voltage Low
- P129B 2017 GMC Sierra — Fuel Pump Driver Control Module System Voltage Low
- P129B 2018 GMC Sierra — Fuel Pump Driver Control Module System Voltage Low
Frequently Asked Questions about P129B GMC Code
1. What are the common symptoms of OBDII code P129B GMC?
- Common symptoms include poor engine performance, reduced fuel efficiency, difficulty starting the vehicle, and the illumination of the check engine light.
2. What causes the OBDII code P129B GMC to trigger?
- The code P129B GMC is typically triggered when the fuel pump driver control module detects a low voltage condition in the system.
3. How can I diagnose the issue related to code P129B GMC?
- It is recommended to perform a thorough inspection of the fuel pump driver control module, check the wiring and connections for any damage or corrosion, and test the voltage levels to identify the root cause.
4. Can a faulty fuel pump cause code P129B GMC to appear?
- Yes, a faulty fuel pump can lead to a low voltage condition in the fuel pump driver control module, triggering the OBDII code P129B GMC.
5. What are some repair tips for addressing OBDII code P129B GMC?
- Repair tips may include checking and repairing any damaged wiring or connections, replacing the fuel pump driver control module if necessary, and ensuring proper voltage levels in the system.
6. Is it safe to continue driving with OBDII code P129B GMC present?
- It is not recommended to continue driving with the code P129B GMC present, as it can lead to further damage to the vehicle's fuel system and potentially cause a breakdown.
7. Can a DIY enthusiast fix the issue related to code P129B GMC?
- Depending on their skill level and access to tools, a DIY enthusiast may be able to address the issue by following repair guides and procedures specific to the OBDII code P129B GMC.
8. How much does it typically cost to repair OBDII code P129B GMC?
- The cost of repairing the OBDII code P129B GMC can vary depending on the underlying cause, parts needed for replacement, and labor costs, but it is recommended to consult a mechanic for an accurate estimate.
9. Are there any preventive measures to avoid triggering code P129B GMC in the future?
- Regular maintenance of the fuel system, including checking for any signs of wear or damage, can help prevent issues that may lead to triggering the OBDII code P129B GMC.
10. Can a mechanic reset the OBDII code P129B GMC after the issue has been resolved?
- Yes, a mechanic can reset the OBDII code P129B GMC using a diagnostic scanner after the underlying issue has been identified and repaired.
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