P0629
Fuel Pump A Control Circuit High
P0629 is an OBD-II diagnostic trouble code meaning: Fuel Pump A Control Circuit High. Common causes: pump relay control wire shorted to positive wire, pump relay contacts sticking in closed position. Estimated repair cost: $3–33.
Symptoms
- The Check Engine light comes on
- The fuel pump runs constantly when the ignition is on
- Increased pump noise due to continuous operation
- Accelerated pump wear
- Possible pump overheating
Causes
- Pump relay control wire shorted to positive wire
- Pump relay contacts sticking in closed position
- Malfunction of the ECU control transistor (constantly open)
- Damage to control wire insulation
- Installation error after repair work
How to Fix
- Check if the pump works with the ignition off
- Check the pump relay for stuck contacts
- Measure the voltage at the control terminal of the computer with the ignition off
- Check the control wire for short to positive
- Eliminate the identified short circuit
- If the external circuit is working properly - ECU diagnostics
Related codes
Error P0629 by Vehicle Brand
FAQ
What does the P0629 code mean?
P0629 is an OBD-II diagnostic trouble code that indicates: Fuel Pump A Control Circuit High
What causes a P0629 error code?
The most common causes of P0629 include: Pump relay control wire shorted to positive wire; Pump relay contacts sticking in closed position; Malfunction of the ECU control transistor (constantly open); Damage to control wire insulation.
How do I fix a P0629 diagnostic trouble code?
To fix P0629: Check if the pump works with the ignition off. Check the pump relay for stuck contacts. Measure the voltage at the control terminal of the computer with the ignition off. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0629?
Yes, but get it checked soon
How much does it cost to fix P0629?
The estimated repair cost for P0629 is $3–33. Actual cost depends on your vehicle, location, and labor rates.
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