GMC Sierra:  P2135 DTC:  Meaning, Causes, and Diagnosis

P2135 is a generic powertrain code that can affect any make or model of vehicle that has a “drive by wire” throttle system (almost every vehicle made today). P2135 TPS Switch “A/B” Voltage Correlation If your GMC Sierra has P2135 it is considered “drive by wire”.  Which means that it uses sensors and actuators to control … Read more

GMC Sierra P2197: 02 Sensor B2S1 – Signal Stuck Lean

P2197 is a general DTC code that indicates that the signal coming from your GMC Sierra’s first O2 sensor on the bank two side of the engine is stuck giving off a lean signal.  The voltage reading from a normal oxygen sensor should look something like a heartbeat, whereas with P2197 the voltage looks like a … Read more

GMC Sierra P2195 Causes + Diagnosis

P2195 is a general OBD2 code that indicates that the signal coming from your GMC Sierra’s 1’st O2 sensor on Bank 1 Sensor 1 is stuck lean. DTC P2195 is a general code, which means that it has the same meaning for any make, model, or year.  It is most typically caused by a bad … Read more

GMC Sierra P2272:  B2S2 O2 Sensor – Stuck Lean

P2272 in the GMC Sierra is a general diagnostic trouble code.  It means that the “bank 2” downstream oxygen sensor (behind the catalytic converter) is continuously sending voltage that indicates a lean air/fuel mixture.   This does not necessarily mean that the vehicle is running lean (although it can, but usually doesn’t).  P2272 is typically … Read more

GMC Sierra P2270: Symptoms, Causes, + Diagnosis

P2270 is a general DTC trouble code, which means it has the same meaning for the GMC Sierra as it would any other vehicle.  It means that the oxygen sensor located on bank 1 behind the catalytic converter is continuously sending voltage that indicates a lean air/fuel mixture.   This does not necessarily mean that … Read more

GMC Sierra P0453: Fuel Tank Pressure Sensor/Switch Too High

Your GMC Sierra utilizes an evaporative emissions control (EVAP) system to migrate fuel vapors from the gas tank and fuel filler neck, and sends them to the engine to be burned off.  When the pressure inside of the fuel tank is too high, P0453, is thrown and the check engine light comes on. If the only … Read more

GMC Sierra P0452:  FUEL Tank Pressure Low Diagnosis

P0452 is a generic OBD II code that can occur in the GMC Sierra.  It means that your Sierra’s EVAP system has detected low fuel tank pressure. The evaporative emissions control system (EVAP) sends fuel vapors from the fuel tank to the intake manifold to be burned off.  When the pressure in the system is … Read more

P2189 GMC Sierra:  Lean Condition at Idle (Bank 2)

P2189 is a DTC code that can occur in your GMC Sierra.  It indicates the air fuel mixture is too lean at idle, specifically in bank 2 (we’ll cover how to find bank 2 later).  Its is different from the much more common P0174, which indicates that bank 2 is lean at any engine speed. … Read more

GMC Sierra:  SVC Tire Monitor

Your GMC Sierra is equipped with a tire pressure monitor system.  This system notifies you if the tire pressure is too low.  When you get the Service Tire Monitor warning, it indicates that there is a problem with the tire monitoring system itself.  Id does not mean that the tire pressure is (necessarily) too low. … Read more

GMC Sierra P2187:  Bank 1 A/F Mixture Too Lean”

P2187 is a DTC code that can occur in the GMC Sierra.  It indicates the air fuel mixture is too lean at idle. The technical definition for P2187 “System Too Lean at Idle: Bank 1”.  The code is thrown after your Sierra’s oxygen sensor on Bank 1 (usually sensor 1) has detected that the air … Read more