Possible causes of P1605 fault code depending on make/model of vehicle!
Ford P1605: PCM Keep Alive Memory Test Error Conditions Cause: Key on, then the PCM detected an internal memory fault This code can be set if KAPWR to the PCM is interrupted The code will set the first time at initial key on
GM P1605: Loss Of HVAC Serial Data Conditions Cause: DTC P0322 not set, engine speed 500 rpm or higher for 10 continuous seconds, then the PCM detected invalid or no serial data from the HVAC Programmer for a period of 11 seconds
Hyundai P1605: G-sensor - circuit malfunction Cause: Wiring, G-force sensor, ECM
Infiniti P1605: Diagnosis communication, AT - circuit malfunction Cause: Wiring, TCM
Lexus P1605: Knock control - malfunction Cause: ECM
Mazda P1605: Engine control module (ECM) - keep alive test error Cause: ECM
Mercedes-Benz P1605: Acceleration sensor, ESP/ASR system - rough road signal, comparison of wheel speeds Cause: Trouble code(s) stored in other system(s)
Nissan P1605: AT diagnosis communication line - communication malfunction Cause: Wiring, TCM
Saab P1605: Engine control module (ECM) - defective Cause: ECM
Toyota P1605: Knock control - malfunction Cause: ECM
Depends on model. http://www.obd-codes.com/p1605
The car is a 2000 Nissan Quest. Sorry for not mentioning it earlier.
It is a auto transmission communication fault. Check the wiring and plug on the transmission control module for broken or exposed wiring. If they are all good it could be the transmission control module that is faulty.
Car is toyota axio code 1605..plz help..
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