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Definition of check engine code P1644:
Chrysler/Dodge/Jeep:
Incorrect Variant/Configuration
Citroen/Peugeot:
Fuel Pump Speed Control Circuit Malfunction
Ford:
Fuel Pump Speed Control Circuit Malfunction
GM:
Traction Control Delivered Torque Output Circuit
Honda:
MOTFSA Signal Malfunction
Lincoln:
Fuel Pump Speed Control Circuit Malfunction
Mercedes:
Transmission version can't be checked due to low voltage at transmission ECU
Mercury:
Fuel Pump Speed Control Circuit Malfunction
Oldsmobile:
Fuel Pump Speed Control Circuit Malfunction
Volkswagen/Audi:
Please check DTC Memory of clutch ECU
Volvo:
Please check DTC Memory of clutch ECU