P0116 indicates that your GMC Sierra’s engine coolant temperature sensor is sending a signal to the PCM (powertrain control module) that is outside of its normal operating range (in terms of voltage). While P0116 is a generic OBD2 code (it has the same definition for any car or truck), it has the same basic causes … Read more
P0117 is a generic OBD2 code. It indicates that your GMC Sierra’s PCM (powertrain control module) has detected the signal coming from the engine coolant temp (ECT) sensor has a voltage level below its normal operating range. With the ECT sensor, as the voltage level drops, it will appear that your Sierra is overheating. While … Read more
P0743 is a generic OBD2 code that can occur in the GMC Sierra. It indicates that your ECU/TCM has found an issue with the torque converter clutch solenoid. It is a generic code (meaning it has the same definition for all cars and trucks). Repair steps are going to vary depending on your Sierra’s model … Read more
P0776 is a generic OBD2 code that can occur in GMC Sierra’s equipped with an automatic transmission. This code indicates that the pressure control solenoid “B” inside your Sierra’s transmission is having a performance issue, or is stuck in the off position. P0776 Definition: Pressure Control Solenoid “B” – Performance/Stuck Here’s the definition of P0776, … Read more
P0400 is a standard code that indicates your GMC Sierra’s EGR system is not working. The good news is that this code is not a breakdown risk and should not affect how your Sierra runs (assuming it’s the ONLY code). P0400 is a generic code, which means it has the same definition for the Sierra … Read more
P0677 is a common diagnostic trouble code found in diesel engines. It’s a generic code, which means it has the same definition for the GMC Sierra as it would any other vehicle. P0677 indicates that the seventh cylinder glow plug is not heating its assigned combustion chamber. Your Sierra likely has a bad glow plug … Read more
P0103 is a common generic OBD2 trouble code that can occur in the GMC Sierra. In plain English, the MAF sensor voltage signal is outside of the accepted range (too high). It’s important to understand what the MAF sensor does. It measures the air density and volume between the air filter and the intake manifold. It’s … Read more
P0106 is a very common OBD2 trouble code that can occur in the GMC Sierra. Simply put, this code indicates that the signal coming from the MAP sensor is not what it should be. P0106 Definition: MAP Sensor – Range/Performance P0106 is a generic OBD2 code, which means that it has the same definition for … Read more
P0107 is a relatively common OBD2 trouble code that can occur in the GMC Sierra. In plain English, it indicates that the voltage coming from the MAP sensor is below the normal operating range. P0107 Definition: MAP Sensor – Circuit Low Input It’s a generic code, so it has the same meaning for the Sierra … Read more
P0056 is a somewhat common O2 sensor-related OBD2 trouble code. It is a generic code, which means it has the same definition for the GMC Sierra as it would any other vehicle. This code is almost always caused by a bad heated oxygen sensor or wiring issue and almost never creates drivability issues. P0056 should … Read more