P0629
Fuel Pump A Control Circuit High
Fuel Pump A Control Circuit High: the control-circuit voltage is above the expected range. Often an open circuit or a short to supply voltage.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Common causes
Ordered by how often each turns out to be the cause.
- Pump circuit shorted to powerCommon
- Ground openPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Fuel Pump
- Fuel Pump Relay
- Pump Wiring
P0629 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.