Category: OBDii Powertrain Codes

P1646 EVAP Vent Solenoid Output Circuit Possible causes – Faulty EVAP Vent Solenoid– EVAP Vent Solenoid harness is open or shorted– EVAP Vent Solenoid circuit poor electrical connection What about the obd code? The Powertrain Control Module (PCM) has detected the EVAP Vent Solenoid circuit was low Symptoms – Engine Light ON (or Service Engine…

P1636 Inductive Signature Chip Communication Error Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1637 Can Link ECM/ABSCM Circuit / Net Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1638 ECM (Microcontroller) – Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1639 PCM 5 Volt Reference Voltage Circuit Condition Possible causes – Sensor using 5 volt reference line shorted to ground– Circuit short to ground What about the obd code? If the voltage is out of tolerance, the PCM will set DTC P1639. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1639 Description…

P1640 Powertrain DTCs Available in Another Module Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1634 Output Link Circuit Failure Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1635 5 Volt Reference Circuit Possible causes – A/C Pressure sensor harness is open or shorted– MAP sensor harness is open or shorted– EGR valve harness is open or shorted What about the obd code? The P1635 code is set when the reference voltage from the sensor is our of range. Symptoms – Engine Light…

P1628 Module Ignition Supply Input Malfunction Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1629 Theft Deterrent Start Enable Signal Not Received Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1629 Description The Engine Control Module (ECM), the…

P1630 Communication Error Between From ECM To VSC Possible causes – Skid Control ECU / Engine Control Module (ECM) harness is open or shorted– Skid Control ECU / Engine Control Module (ECM) circuit poor electrical connection– Faulty Skid Control ECU– Faulty Engine Control Module (ECM) Symptoms – Engine Light ON (or Service Engine Soon Warning…

P1631 Communication Error Between From ECM To VSC Possible causes – Skid Control ECU / Engine Control Module (ECM) harness is open or shorted– Skid Control ECU / Engine Control Module (ECM) circuit poor electrical connection– Faulty Skid Control ECU– Faulty Engine Control Module (ECM) Symptoms – Engine Light ON (or Service Engine Soon Warning…

P1632 Theft Deterrent Start Disable Signal Received Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1632 Description The Engine Control Module (ECM), the Powertrain…

P1633 ECM Malfunction ETCS Circuit Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1633 ECM Malfunction ETCS Circuit

P1622 Immobilizer ID Does Not Match Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1623 Immobilizer Code Word/ID Number Write Failure Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1623 Information for specific makes

P1623 Transmission Temp Pull-Up Resistor Tech description On some models, the P1623 code is for the “Check Engine Lamp”. If this codes is stored in the Engine Control Module (ECM), the check engine light is probably not illuminating. If this is the case the wire circuit from the ECM is probably open or shorted, or…

P1624 Customer Snapshot Requested – Data Available Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1625 PCM System Reset Symptoms – Engine Light ON (or Service Engine Soon Warning Light)