P129C 2018 Chevrolet Silverado Code - Fuel Pump Driver Control Module System Voltage High
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
- P129C 2018 Chevrolet Silverado indicates Fuel Pump Driver Control Module System Voltage High.
- 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 P129C 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P129C 2018 Chevrolet Silverado?
- 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 P129C 2018 Chevrolet Silverado?
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 P129C 2018 Chevrolet Silverado 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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Frequently Asked Questions about P129C 2018 Chevrolet Silverado Code
1. What does the OBDII code P129C mean on a 2018 Chevrolet Silverado?
The P129C code indicates that the Fuel Pump Driver Control Module (FPCM) is detecting a system voltage that is higher than the expected range.
2. What are the common symptoms of code P129C in a 2018 Chevrolet Silverado?
Symptoms may include the check engine light being illuminated, engine stalling, rough idling, poor fuel efficiency, or difficulty starting the vehicle.
3. What causes the P129C code to appear on a 2018 Chevrolet Silverado?
Possible causes include a faulty Fuel Pump Driver Control Module, wiring issues like damaged or corroded connectors, a malfunctioning fuel pump, or an alternator overcharging the system.
4. How can I diagnose the P129C code on my 2018 Chevrolet Silverado?
Start by scanning for codes using an OBDII scanner, inspecting the Fuel Pump Driver Control Module and its wiring for damage or corrosion, and testing the alternator and fuel pump voltage levels.
5. Can I drive my 2018 Chevrolet Silverado with the P129C code?
Driving with this code is not recommended as it can lead to engine performance issues, potential stalling, or further damage to the fuel system components.
6. How is the P129C code typically fixed on a 2018 Chevrolet Silverado?
Repairs may involve replacing the Fuel Pump Driver Control Module, repairing wiring or connectors, addressing alternator overcharging issues, or replacing the fuel pump if necessary.
7. Is the P129C code specific to the 2018 Chevrolet Silverado?
No, the P129C code can appear in other GM vehicles with similar fuel system configurations, but the diagnosis process might vary slightly.
8. How much does it cost to fix the P129C code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the root cause but may range from $150 to $600, including parts and labor, with module replacement being on the higher end.
9. Can a weak battery trigger the P129C code on a 2018 Chevrolet Silverado?
While a weak battery typically causes low voltage issues, it’s worth checking the battery and alternator to rule out overcharging or electrical inconsistencies.
10. Should the Fuel Pump Driver Control Module be reprogrammed after replacement for code P129C?
Yes, in most cases the new module will need to be programmed or calibrated using a GM-compatible scan tool to ensure proper operation.
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