P1643 Cadillac Engine Speed Output Circuit
Possible causes
– Reprogram computer – Faulty ECM
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1643 Cadillac Description
There is a communication problem with Control Area Network (CAN) link from the Engine Control Module (ECM)to the Transmission Control Module (TCM)
Cadillac Vehicle:Cadillac CTS Coupe, Cadillac CTS-V Coupe , Cadillac Eldorado , Cadillac Escalade EXT , Cadillac ATS , Cadillac CTS , Cadillac CTS Sedan , Cadillac CTS Sport Sedan , Cadillac CTS-V , Cadillac CTS-V Sedan , Cadillac Catera , Cadillac DTS , Cadillac DeVille , Cadillac STS-V , Cadillac STS , Cadillac Seville , Cadillac XTS , Cadillac XLR , Cadillac XLR Platinum , Cadillac Escalade , Cadillac SRX