P0030 is a very common OBD2 trouble code. It’s generic, which means it has the same definition for the GMC Sierra as any other vehicle. This code is almost always caused by a bad heated oxygen sensor or wiring issue. P0030 Definition: Heater Control – Circuit – B1S1 P0030 indicates no signal coming from your … Read more
P0730 is a standard OBD2 trouble code. It indicates that your GMC Sierra’s PCM has detected an incorrect gear ratio. While this code can appear if you changed your Sierra’s transmission or rear end gearing without re-flashing the computer, it almost always has nothing to do with an incorrect gear ratio. An internal transmission problem … Read more
P0871 is a somewhat rare diagnostic trouble code. While your GMC Sierra’s check engine light will come on, this particular code indicates that there’s something wrong with the transmission, specifically the transmission fluid pressure sensor switch “C”. It’s a generic code, so P0871 has the same definition for any vehicle made for the 1996 model … Read more
P0676 is a common diagnostic trouble code found in diesel engines. It’s a generic code, which means it has the same definition for your diesel-powered GMC Sierra as it would any other vehicle. P0676 indicates that the sixth cylinder glow plug is not heating its corresponding combustion chamber. It’s likely that your Sierra has a … Read more
P0480 is a relatively common OBDII trouble code. It indicates that your GMC Sierra’s “cooling fan 1 control circuit” is malfunctioning. It’s a generic code, so it has the same meaning for any vehicle made for the 1996 model year and up. P0480 Definition: Cooling Fan 1 – Control Circuit Malfunction Here is the … Read more
P0320 is a relatively common ignition-related trouble code. P0320 indicates that your GMC Sierra’s ignition/distributor engine speed circuit is malfunctioning. P0320 is most likely caused by the engine speed sensor, or a wiring issue. P0320 Definition: Ignition/Distributor Engine Speed – Input Circuit Nearly all modern vehicles, including the GMC Sierra, use individual coil packs which … Read more
P0717 is a somewhat rare OBD2 trouble code that can occur in the GMC Sierra. While it illuminates the check engine light, the code warns of a transmission-related error, specifically that the input shaft/turbine speed sensor is not sending a signal. P0717 is a generic code (it has the same meaning for any vehicle made … Read more
P0601 is a somewhat rare OBD2 trouble code. It’s a generic code (it has the same meaning for the GMC Sierra as it would any other vehicle). While it indicates that the PCM’s memory failed a memory check, P0601 is commonly seen when people use OBD2 port plugin accessories on their vehicle. These accessories are … Read more
P0846 is a relatively common trouble code. While your GMC Sierra’s check engine light will come on, P0846 is a transmission-related trouble code, specifically the transmission fluid pressure sensor circuit. It’s a generic code, so P0846 has the same definition for any vehicle made for the 1996 model year and up. Before doing anything, check … Read more
P0841 is a relatively common trouble code. While your GMC Sierra’s check engine light will come on, this particular code indicates that there’s something wrong with the transmission, specifically the transmission fluid pressure sensor circuit. It’s a generic code, so P0841 has the same definition for any vehicle made for the 1996 model year and … Read more