Tag: GMC

P0121 GMC Throttle Position Sensor 1 Performance

Possible causes – Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection– Faulty throttle position sensor.– Faulty Engine Control Module (ECM) When is the obd code mean? Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM. Symptoms – Engine Light ON…

P1870 GMC Transmission Component Slipping

Possible causes – Trailer towing may set code– Check transmission fluid level– Internal transmission fault Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1870 GMC OBD Code Description

P1686 GMC Transmission Control Module Power Up Temperature Sensor Circuit High Voltage

Possible causes – Reprogram TCM and recheck code– Replace Transmission Control Module (TCM) Sensor/body assembly one piece Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1686 GMC OBD Code Description The Transmission Control Module (TCM) power up the temperature sensor is located inside of the control solenoid (w/body and TCM) valve assembly…

P1415 GMC Secondary Air Injection System Bank 1

Possible causes – Secondary Air Injection check valve bank 2– Secondary Air Injection (AIR) pump electrical circuit fault – Blocked Secondary Air Injection (AIR) system – Faulty Secondary Air Injection (AIR) pump When is the obd code mean? The P1415 code is set when no O2 sensor voltage change is detected by the Engine Control…

P1416 GMC Secondary Air Injection System Bank 2

Possible causes – Secondary Air Injection check valve bank 2– Secondary Air Injection (AIR) pump electrical circuit fault – Blocked Secondary Air Injection (AIR) system – Faulty Secondary Air Injection (AIR) pump When is the obd code mean? The P1416 code is set when no O2 sensor voltage change is detected by the Engine Control…

P1639 GMC PCM 5 Volt Reference Voltage Circuit Condition

Possible causes – Sensor using 5 volt reference line shorted to ground– Circuit short to ground When is the obd code mean? If the voltage is out of tolerance, the PCM will set DTC P1639. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1639 GMC OBD Code Description The powertrain control module…