OBD Guide
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P129F

Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect

P129F is an OBD-II diagnostic trouble code meaning: Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect. Common causes: fuel pump malfunction, damage to the wiring harness to the pump. Estimated repair cost: $28–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$28–167 (est.)

Symptoms

  • Unstable engine idling
  • Power dips during acceleration
  • The engine stalls while driving
  • Increased fuel consumption
  • Difficulty starting the engine

Causes

  • Fuel pump malfunction
  • Damage to the wiring harness to the pump
  • Problems with the fuel pump control module
  • Corrosion or poor contact in connectors
  • Fuel pump relay malfunction

How to Fix

  1. Check the condition of the fuel pump
  2. Inspect the wiring harness and connectors for damage.
  3. Check voltage at pump control module
  4. Test the fuel pump relay
  5. If necessary, replace the fuel pump or control module

Related codes

P0180P0230P0627

FAQ

What does the P129F code mean?

P129F is an OBD-II diagnostic trouble code that indicates: Fuel Pump Driver Control Module Fuel Pump Speed Signal Incorrect

What causes a P129F error code?

The most common causes of P129F include: Fuel pump malfunction; Damage to the wiring harness to the pump; Problems with the fuel pump control module; Corrosion or poor contact in connectors.

How do I fix a P129F diagnostic trouble code?

To fix P129F: Check the condition of the fuel pump. Inspect the wiring harness and connectors for damage.. Check voltage at pump control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P129F?

Yes, but get it checked soon

How much does it cost to fix P129F?

The estimated repair cost for P129F is $28–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat