GMC Sierra: Bad Motor Mount → Symptoms + Diagnosis

While your GMC Sierra’s engine mounts can last the life of the entire vehicle, it is possible that they will go bad.  Vibration and a clunking sound are the two most noticeable symptoms when driving the vehicle.  There are plenty of visible signs as well. Engine mounts connect the engine to the frame of the … Read more

GMC Sierra:  Bad ECM → Symptoms + Diagnosis

Your GMC Sierra’s ECM (Engine Control Module) is its brain.  Just like a human’s brain, your Sierra can’t function without it. It is sometimes referred to as the ECU or PCM.  It’s all the same thing. The ECM controls and directs your entire drivetrain (unless there is a serrate transmission controller). When an ECM starts … Read more

GMC Sierra P0354:  Coil Pack “D” Malfunctioning – Diagnosis

P0354 is a generic OBD2 code that indicates that ignition coil “D” has an issue with the primary or secondary wiring circuits.  If your GMC Sierra has thrown this code, it may be accompanied by P0304.  P0354 is a relatively straightforward diagnosis and is typically caused by a bad coil pack or wiring harness issue, … Read more

GMC Sierra P0353 Diagnosis

P0353 is a generic OBD2 code that indicates that ignition coil “C” has an issue with the primary or secondary wiring circuits.  It has the same meaning for the GMC Sierra as it would any other vehicle.  It is typically caused by a bad coil pack or wiring harness issue, although there can be caused … Read more

GMC Sierra P0087:  Fuel Rail/System Pressure → Too Low

P0087 is a relatively common OBD II trouble code.  This code indicates that there is an issue with getting enough fuel pressure to the fuel rails.  It’s generic, which means that it has the same meaning for the GMC Sierra as it would any other vehicle. This code is most common on vehicles that use … Read more