P0628 Buick Low Voltage Detected At The Fuel Lift Pump

P0629 Buick Fuel Pump A Control Circuit High

Possible causes
– Faulty Fuel Pump
– Fuel pump harness is open or shorted
– Fuel pump circuit poor electrical connection
– Faulty Fuel Pump Relay
– Faulty fuel pump control module (if applicable)
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0629 Buick Description

When the ignition switch is turned ON the Engine Control Module (ECM) will power the fuel pump relay and run the in-tank fuel pump.

Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera