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Fuel and air

P0629 Fuel pump: signal or voltage too high ("A")

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P0629 means: Fuel pump: signal or voltage too high ("A"). The fuel pump delivers fuel from the tank to the engine. Don't drive until the car has been checked. The engine could be damaged. The most common repair costs about €45–90 in Estonia, depending on make and model.

Is it safe to drive?Don't driveDon't drive until the car has been checked. The engine could be damaged.
Wiring or connector repair€45–90parts and labour in Estonia, depending on make and model

What it means

The fuel pump delivers fuel from the tank to the engine. The computer found a fault in the pump supply or control. The signal voltage is too high. Usually a wire is shorted to power, the ground is broken or the part itself has failed.

What you may notice

  • No start or hard starting
  • The engine cuts out while driving
  • Less power

What could be wrong

  1. 1Connector loose, damp or corroded · Wiring or connector repair €45–90
  2. 2Wire shorted to power or ground broken · Wiring or connector repair €45–90
  3. 3Faulty fuel pump · Fuel pump replacement €250–500
  4. 4Engine computer fault (rare) · Control unit check and software €150–300

Repair difficulty: Moderate

What you can check yourself

First look at the connector and wiring: anything loose, melted or green with corrosion? Switch the ignition on and listen for the pump humming from the tank for a couple of seconds. Check the fuse. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

  1. We read the fault data on the diagnostic tool and check whether the fault is constant
  2. We measure the circuit's supply, ground and signal
  3. We repair the wire or replace the connector
  4. If the wiring is fine, we replace the fuel pump

Standard SAE description: Fuel Pump "A" Control Circuit High

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Car won't start

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0629 mean?

Fuel pump: signal or voltage too high ("A"). The fuel pump delivers fuel from the tank to the engine. The computer found a fault in the pump supply or control. The signal voltage is too high. Usually a wire is shorted to power, the ground is broken or the part itself has failed.

Can I drive with code P0629?

Don't drive until the car has been checked. The engine could be damaged.

How much does it cost to fix P0629?

It depends on the cause: wiring or connector repair €45–90; fuel pump replacement €250–500. Prices include labour at €45/h, depending on make and model.

How is P0629 fixed?

We read the fault data on the diagnostic tool and check whether the fault is constant. We measure the circuit's supply, ground and signal. We repair the wire or replace the connector. If the wiring is fine, we replace the fuel pump.

Related codes

P0628Fuel pump: signal or voltage too low ("A")P0627Fault in fuel pump controlP0626Alternator and charging: signal or voltage too highP2287Injector control pressure (ICP): signal drops out at timesP2288Injector control pressure (ICP): too highP2289Injector control pressure (ICP): too high (engine off)

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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