P129F On GM vehicles, the fuel pump power control module reports that the fuel pump speed signal is incorrect

Fuel pump control module speed signal incorrect (GM)

P129F in short

On GM vehicles, P129F means the fuel pump power control module reports an incorrect fuel pump speed signal. GM traces many cases to an internal short in that module (FPDCM), which can cause no-starts, stalling or loss of power. If the engine stalls or loses power while driving, stop safely and tow.

Many newer GM vehicles don't run the fuel pump straight from a relay. A separate module, the fuel pump driver control module (FPDCM, K111), varies pump speed to hold the pressure the engine needs and reports back to the engine computer.

GM defines P129F as 'Fuel Pump Power Control Module Fuel Pump Speed Signal Incorrect'. It often appears with P023F, a fuel pump control circuit code. GM's 2026 TechLink article says an internal short in the module can cause crank/no-start, rough running and the check engine light.

GM's bulletins direct dealers to replace the FPDCM when the symptoms are verified with P023F or P129F, then run a configuration procedure. TechLink notes the repair is covered under the federal emission warranty (8 years/80,000 miles). This page covers GM only; other makers may use P129F differently.

Pick your make

P129F is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Internal fault in the fuel pump driver control module (K111)

    Supported by vehicle data
    Why it ranks here
    GM's bulletins and TechLink article name the FPDCM as the part to replace when P129F or P023F is verified.
    What would change this
    Likelier with P023F also stored and symptoms such as no-start or stalling.

  2. Wiring or connector fault between the module, pump and engine computer

    Possible — needs testing
    Why it ranks here
    The code is about a signal, so a poor connection could also corrupt it. GM's engineering request asked technicians to work through a check list before replacing parts.
    What would change this
    Likelier if the module has been replaced and the code returns.

  3. Failing fuel pump

    Possible — needs testing
    Why it ranks here
    The module reports pump speed; a pump that can't run at the commanded speed could also upset it.
    What would change this
    Consider only after the module and wiring are cleared.
    How to test the fuel pump

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read codes from all modules and note whether P023F is stored with P129F, and whether the car has stalled or failed to start

    Low riskTool: OBD-II or full-system scan tool

  2. Have the dealer or a shop with GM service information test the FPDCM circuits and fuel pump, then configure any replacement module

    Best left to a shopTool: GM-capable scan tool, digital multimeter

    Warning:Fuel system work carries a fire risk, and a replacement FPDCM must be configured with factory-level software.

Symptoms

  • Crank but no start
  • Engine stalls or cuts out while driving Gets more serious: stop and have it checked.
  • Loss of power or no acceleration Gets more serious: stop and have it checked.
  • Rough idle
  • Fuel gauge inoperative or erratic

Compare with: Check engine light with loss of power

How to fix

  1. Ask a GM dealer whether bulletin 24-NA-139 applies to your VIN, and whether the federal emission warranty (8 years/80,000 miles) covers the module.

Parts and cost context

  • Fuel pump:GM's fix for this code is usually the fuel pump driver control module, not the pump itself. The module must be configured after fitting. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

  • 2021–2023 · Equinox

    Supported by vehicle data

    GM bulletins replace the fuel pump driver control module for stalling or no-start with P129F; GM also opened an engineering inquiry on 2022 models. Whether the bulletins are still current is not verified.

  • 2022–2023 · Silverado 1500

    Supported by vehicle data

    FPDCM replacement for P129F with no-start, stalling or loss of power. Whether the bulletin is still current is not verified.

  • 24-NA-139Status unverified

    Replace fuel pump driver control module for no start, stalling, loss of power with P023F/P129F

    2021–2023equinox, blazer, traverse, tahoe, malibu, silverado-1500 · issued · NHTSA 11006410

    Replace the FPDCM if it causes crank-no-start, stalling, loss of power, an inoperative or erratic fuel gauge or MIL with P023F and/or P129F. Also Buick, Cadillac and GMC models.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • PIP5964CStatus unverified

    Replace K111 FPDCM if no start, stalling, loss of power etc. are verified with P023F or P129F

    2021–2023equinox, blazer, traverse, tahoe, malibu, silverado-1500 · issued · NHTSA 10253111

    Replace the K111 FPDCM if no start, stalling, rough idle, no acceleration, loss of power, erratic shifting or an inoperative fuel gauge is verified with P023F or P129F.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • PIE0730Status unverified

    Engineering information request: MIL, no start and/or stall with P129F (Equinox, Terrain)

    2022equinox · issued · NHTSA 10228854

    Engineering information request: MIL on, no start and/or stall with P129F. Also GMC Terrain.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

GMC

  • 2021–2023 · Terrain

    Supported by vehicle data

    Covered by the same FPDCM bulletin as the Equinox. Whether the bulletin is still current is not verified.

Buick

  • 2021–2023 · Enclave

    Supported by vehicle data

    FPDCM replacement for P129F with no-start or stalling. Whether the bulletin is still current is not verified.

Cadillac

  • 2021–2023 · Escalade

    Supported by vehicle data

    FPDCM replacement for P129F with no-start or stalling. Whether the bulletin is still current is not verified.

No curated relationships for P129F yet.

All Fuel pump and injectors codes

P129F questions

Is P129F covered under warranty on my GM vehicle?

Often. GM says the fuel pump driver control module repair falls under the federal emission warranty, 8 years or 80,000 miles. Ask a dealer to check your VIN.

Do I need a new fuel pump for P129F?

Usually not. GM's published fix is the fuel pump driver control module, which then has to be configured with dealer software.

Sources and review

  1. Fuel Pump Power Control Module Internal Short (GM TechLink) — General Motors (GM TechLink) ,
  2. 24-NA-139: Replace fuel pump driver control module for no start, stalling, loss of power with P023F/P129F — General Motors / NHTSA ,
  3. 2023 Integra Owner's Manual: Indicator, Coming On/Blinking — American Honda Motor Co.
  4. PIP5964C: Replace K111 FPDCM if no start, stalling, loss of power etc. are verified with P023F or P129F — General Motors / NHTSA ,
  5. NHTSA recall 26V081: Electronic throttle body gears may break (2024-2025 Nissan Rogue 1.5L VC-Turbo) — Nissan North America / NHTSA ,
  6. PIE0730: Engineering information request: MIL, no start and/or stall with P129F (Equinox, Terrain) — General Motors / NHTSA ,
  7. 24-NA-139 (2025 revision): Replace fuel pump driver control module for crank no start, stalling, P023F/P129F — General Motors / NHTSA ,
Last reviewed
Written by
Saurabh K.
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