P2634 Code – Fuel Transfer Pump Relay Control Circuit High Voltage

Code P2634 Possible Causes
Faulty Secondary Fuel Pump Relay
Secondary Fuel Pump Relay circuit poor electrical connection
Secondary Fuel Pump Relay harness is open or shorted
Engine Control Module ECM circuit poor electrical connection
Engine Control Module ECM harness is open or shorted
Engine Control Module ECM software update

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