P129D
Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
P129D is an OBD-II diagnostic trouble code meaning: Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage. Common causes: problems with wiring or contacts in the fpdm control circuit, fuel pump control module (fpdm) malfunction. Estimated repair cost: $17–89.
Symptoms
- Engine won't start
- Floating idle speed
- Loss of power during acceleration
- The engine stalls
- Check Engine light comes on
Causes
- Problems with wiring or contacts in the FPDM control circuit
- Fuel pump control module (FPDM) malfunction
- Problems with the fuel pump relay
- Low battery voltage
- Engine control unit (ECU) malfunction
How to Fix
- Check battery voltage
- Inspect the wiring and contacts in the FPDM control circuit
- Check fuel pump relay
- Test the fuel pump control module (FPDM)
- If necessary, replace faulty components
Related codes
FAQ
What does the P129D code mean?
P129D is an OBD-II diagnostic trouble code that indicates: Fuel Pump Driver Control Module Ignition On/Start Switch Circuit Low Voltage
What causes a P129D error code?
The most common causes of P129D include: Problems with wiring or contacts in the FPDM control circuit; Fuel pump control module (FPDM) malfunction; Problems with the fuel pump relay; Low battery voltage.
How do I fix a P129D diagnostic trouble code?
To fix P129D: Check battery voltage. Inspect the wiring and contacts in the FPDM control circuit. Check fuel pump relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P129D?
Do not drive — repair immediately
How much does it cost to fix P129D?
The estimated repair cost for P129D is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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