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Definition of check engine code P1637:
BMW:
Throttle Valve Position Control; Control Deviation
Chrysler/Dodge/Jeep:
TCM Internal - EEPROM Performance
Citroen/Peugeot:
Can Link ECM/ABSCM Circuit / Network Malfunction
Ford:
Can Link ECM/ABSCM Circuit / Network Malfunction
GM:
Generator L-Terminal Circuit
Jaguar:
CAN Link ECM/ABS Control Module Circuit/Network
Kia:
CAN Link ECM / ABS Control Module Circuit / Network
Saturn:
Alternator L Circuit Low Input
Toyota:
E(G?)STP signal Malfunction (ESTP Signal Malfunction – Pri)
Volkswagen/Audi:
Data Bus Powertrain missing message f. central electr. control
Volvo:
Data Bus Powertrain missing message f. central electr. control