Possible causes
– Faulty Upshift Switch
– Upshift Switch harness is open or shorted
– Upshift Switch circuit poor electrical connection
– Upshift Switch harness is open or shorted
– Upshift Switch circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0815 FORD OBD Code Description
The Engine Control Module (ECM) has detected a fault in the transmission upshift circuit