P0629

Fuel Pump A Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$3–33 (est.)

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

P0627 P0628 P062A