Modern vehicles use knock sensors to detect engine detonation. This allows the PCM (powertrain control module) to run very aggressive spark timing. If you are concerned that your GMC Sierra has a bad knock sensor, we’ve listed them out below. A knock sensor works by listening to your engine and determining if your Sierra is … Read more
No matter where you live if your GMC Sierra’s AC compressor is not turning on, it can turn a pleasant commute into a nightmare (particularly if you have kids that are riding with you). The AC compressor pulley is always being turned by either the serpentine belt or a dedicated belt (it’s going to depend … Read more
U0101 is a generic powertrain code, which means it has the same definition for the GMC Sierra as it would any other vehicle. It means that your Sierra’s TCM (Transmission Control Module) can’t communicate with the rest of the vehicle, usually due to a bad wiring harness or an issue with the TCM itself. U0101 … Read more
P219B is a generic OBD2 trouble code. This code indicates that your GMC Sierra’s air/fuel ratio is out of balance (too rich or too lean) on the bank 2 side of the engine in question. Your Sierra is equipped with oxygen sensors that measure the air-fuel ratio of your engine. It’s these sensors that are … Read more
P219A is a generic OBDII code. The code indicates that your GMC Sierra’s air/fuel ratio is out of balance (too rich or too lean). Your Sierra is equipped with oxygen sensors that measure the air-fuel ratio of your engine. It’s these sensors that are reporting the problem with the air-fuel ratio. With P219A are … Read more
U0100 is a generic diagnostic trouble code, meaning it has the same definition for any vehicle made in the 1996 model year or newer (including the GMC Sierra). This code tells you that communication has been lost between the ECM/PCM (main computer) and a particular control module has been completely lost. When a vehicle has … Read more
P2099 is a generic OBD II code. It has the same meaning for the GMC Sierra as it would any other vehicle. It specifically indicates that your Sierra detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter on the bank 2 side of the engine is too rich. (too much fuel … Read more
P2097 is a generic OBD II code, which means that it has the same meaning for the GMC Sierra as it would any other vehicle. It specifically indicates that your Sierra detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter is too rich. (too much fuel for the amount of fuel … Read more
P2098 is a generic OBD II code. It specifically indicates that your Sierra detected a lean condition after the catalytic converter (too much air for the amount of fuel present). P2098 Definition This particular code is generic, so it has the same meaning for your GMC Sierra as any other vehicle. There are three parts … Read more
P1153 is not a very common diagnostic trouble code. It can have different meanings depending on the manufacturer in question. For the GMC Sierra, it means: P1153:HO2S Insufficient Switching (Bank 2, Sensor 1) As long as your scanner confirms that the code is for insufficient switching of the heated oxygen sensor, you’re good to go. … Read more