P0629 Fuel Pump A Control Circuit High

P0629 indicates a high condition in Fuel Pump A control circuit. The controller sees pump control voltage or feedback above the expected range.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not keep running a pump circuit that appears stuck energized until the relay or module fault is found.

Symptoms of P0629

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0629

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Review pump command, control voltage, relay or module status, fuel pressure, pump current, freeze-frame data, and related high-input codes.
Inspect for short-to-voltage faults, stuck relays, open grounds, damaged pump module wiring, connector corrosion, and backfeed from modified circuits.
Verify whether the pump circuit remains high when not commanded and whether fuel pressure follows the command.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.