GMC Sonoma P0325: Knock Sensor “1” – Circuit Malfunction

P0325 is a powertrain OBDII trouble code that has the same meaning for the GMC Sonoma as it would any other vehicle. By definition, it means that the vehicles ECM/PCM isn’t getting the proper signal to or from the knock sensor. Clearing this code typically requires a new knock sensor or correcting a short or … Read moreGMC Sonoma P0325: Knock Sensor “1” – Circuit Malfunction

GMC Sonoma P0420: Catalyst System Efficiency → Below Threshold → Bank 1

    This page is meant to help you troubleshoot the GMC Sonoma P0420 trouble code. It covers P0420 meaning, symptoms, causes, and possible solutions. WIth the Sonoma, OBDII P0420 is often caused by a bad oxygen sensor, but there can be other causes as well. Jumping straight to replacing the O2 sensor can cost … Read moreGMC Sonoma P0420: Catalyst System Efficiency → Below Threshold → Bank 1

GMC Sonoma P0132: Oxygen Sensor High Voltage (Bank 1 -Sensor 1)

  P0132 is a common OBDII code that occurs in many vehicles, including the GMC Sonoma. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. The air fuel sensor stays in rich biased mode for too long. There are also some less likely problems that can cause … Read moreGMC Sonoma P0132: Oxygen Sensor High Voltage (Bank 1 -Sensor 1)

GMC Sonoma P0128: Coolant Thermostat – Below Temp

P0128 is a relatively common OBDII trouble code. It is triggered when your GMC Sonoma‘s coolant temperature fails to reach the proper operating temperature. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+).   Sonoma P0128 Symptoms There aren’t many symptoms with P0128, unless … Read moreGMC Sonoma P0128: Coolant Thermostat – Below Temp

GMC Sonoma P0121: TPS → Switch “A” Circuit Range → Performance Problem

P0121 is a relatively common trouble code with the GMC Sonoma. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. It is relatively serious problem since it can leave your vehicle in failsafe mode.     OBDII code P0121 is a serious problem that requires serious attention. Diagnosing it can … Read moreGMC Sonoma P0121: TPS → Switch “A” Circuit Range → Performance Problem

GMC Sonoma P0741 OBDII Transmission Code Diagnosis

P0741 is a very common OBDII trouble code. It’s know to affect the GMC Sonoma quite often. Here’s what it means: P0741: Torque Converter Clutch Circuit → Performance or Stuck Off The Sonoma uses a clutch in the torque converter to lock the engine and transmission together at highway speed. P0741 can register whenever this … Read moreGMC Sonoma P0741 OBDII Transmission Code Diagnosis