The Buick fault code P129F indicates an issue with the Fuel Pump and Level Sensor Assembly.
Symptoms include the Engine Light being ON.
This code is commonly caused by a faulty fuel pump, wiring harness issues, or a defective Fuel Pump Driver Control Module.
It is a moderate issue that should be addressed promptly.
To fix it, inspect the wiring harness and connectors for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms for Buick p129f
The vehicle may exhibit poor acceleration and reduced engine performance with fault code P129F.
- Symptoms: Engine Light ON.
- Engine may exhibit reduced power during acceleration.
- Vehicle may run rough or hesitate when driving.
Causes for Buick p129f
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P129F in a Buick typically indicates a fault related to the cylinder deactivation system.
- P129F can be caused by a Faulty Fuel Pump and Level Sensor Assembly.
- A Fuel Pump and Level Sensor Assembly harness that is open or shorted.
- A Fuel Pump and Level Sensor Assembly circuit with poor electrical connection.
- A Faulty Fuel Pump Driver Control Module.
Fix for Buick p129f
To resolve Buick fault code P129F, inspect and replace the faulty thermostat as needed.
- To fix P129F, review the possible causes mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Check the operation of the cooling fan and its circuit.
- Test the cooling fan relay for proper function.
- Replace the cooling fan relay if necessary.
- Clear the fault codes and perform a test drive to verify the repair.
Description for Buick p129f
Buick fault code P129F relates to the cylinder deactivation system on the engine.
Code P129F for a Buick indicates a cylinder head overtemperature condition.
This code is triggered by the ECM (Engine Control Module) based on input from the cylinder head temperature sensor.
The sensor monitors the temperature of the cylinder head and sends signals to the ECM.
If the temperature exceeds a predetermined threshold, the ECM will set this fault code to alert the driver or technician of the issue.
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Tech Notes for Buick p129f
Detailed information on fault code Buick P129F, including symptoms, causes, and diagnostic procedures.
Fault code P129F in a Buick typically indicates an issue with the Transmission Control Module (TCM) powertrain.
To diagnose this fault code, you can start by checking the TCM power and ground using a multimeter.
Ensure that the TCM is receiving proper voltage and ground signals for it to function correctly.
Next, use a scan tool to communicate with the TCM and verify if it responds over the Controller Area Network (CAN) network.
If the TCM is not responding or communicating properly, it could indicate a problem with the TCM itself or the network connections.
Additionally, it’s essential to visually inspect the wiring harness and connectors related to the TCM.
Look for any signs of damage, such as frayed wires, loose connections, or corrosion.
Check the connector pins for any signs of being broken, bent, pushed out, or corroded, as these issues can also cause communication errors.
If you have access to technical service bulletins or software updates for the TCM, consider checking if a reflash or software update is required to address the P129F fault code.
By following these diagnostic steps and performing thorough checks on the TCM power, ground, communication, and wiring connections, you can effectively diagnose and
FAQ
Fault code P129F in a Buick indicates an issue with the Fuel Pump and Level Sensor Assembly. Check for faults in the assembly, wiring, and connections for repair.
Common symptoms for fault code P129F in a Buick include Engine Light ON. Possible causes are faulty Fuel Pump and Level Sensor Assembly or related electrical issues.
Diagnose and repair P129F in your Buick by checking the fuel pump assembly, harness, and connections for faults. Inspect wiring for damage or poor connections.
