Category: OBDii Powertrain Codes

P1602 ECU-TCU Communication Error Possible causes – Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM)– Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted– Transaxle Control Module(TCM) to Engine Control Module(ECM) circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1602 Description A communication line exists…

P1603 ECU-TCU Communication Error Possible causes – Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM)– Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted– Transaxle Control Module(TCM) to Engine Control Module(ECM) circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1603 Description A communication line exists…

P1604 No ID From ECU

P1605 Automatic Transmission Communication Possible causes – Weak battery– Faulty Transmission Control Module (TCM)– Harness is open or shorted between (TCM) and Engine Control Module (ECM)– Poor circuit electrical connection between (TCM) and (ECM) What about the obd code? Malfunction is detected when an incorrect signal from Transmission control module (TCM) is sent to Engine…

P1605 Loss of HVAC Serial Data

P1596 Automatic transmission diagnosis input signal circuit high input

P1597 IAC Sys Low RPM

P1598 IAC Sys High RPM

P1599 Engine Stall or Near Stall Detected

P1600 ECM Battery Back-up Circuit Fault

P1595 Automatic transmission diagnosis input signal circuit low input

P1588 Throttle Control Unit Detected Loss of Return Spring Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1589 TCU Unable To Control Desired Throttle Angle Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1590 Neutral position switch circuit high input

P1591 Neutral position switch circuit low input SUBARU Technical Service Bulletins for P1591 code 2002 WRX Electrical System:ignition:module

P1592 Neutral position switch circuit (MT model)

P1594 Automatic transmission diagnosis input signal circuit malfunction

P1582 Cruise Direction Circuit Low VoltageCode

P1583 Cruise Direction CircuitHigh Voltage

P1584 Throttle Control Detected ETB Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)