GMC Sonoma: SRS On Diagnosis

  When you start your GMC Sonoma, the OBD-II system runs a self diagnostic check on all major systems.  If any of these checks fail, you will see a diagnostic warning light on the dash for the corresponding system.  When the SRS system fails this check, you’ll see the SRS light.  SRS stands for supplemental … Read more

GMC Sonoma P1682: Ignition 1 Switch → Circuit 2

  P1682 is a diagnostic trouble code that indicates that your GMC Sonoma’s ignition switch is having a voltage problem.  It is typically caused by a faulty ignition switch, although there can be other causes as well. There are two “circuits” to the ignition switch.  The first one goes to the ECM through the throttle … Read more

GMC Sonoma Radiator Leak: Symptoms, Causes, Fix

The radiator of a GMC Sonoma can sometimes leak due to various causes, and if not addressed quickly, it can cause costly engine damage. Overheating can occur as a result of a leaking radiator, and this can lead to serious issues like a damaged head gasket or a cracked head. Identifying the symptoms of a … Read more

GMC Sonoma Leaking Heater Core Diagnosis

One of the most common problems that can happen to a vehicle is a heater core leak.  If your GMC Sonoma has a leaking heater core, it is not a breakdown risk.  Although, it is necessary to make sure that the lost coolant is replaced.  It can cause damage to the vehicle in other ways, … Read more

GMC Sonoma Bad Starter → Symptoms & Diagnosis

  One of the most common problems that can occur in the life of a vehicle is a bad starter, that includes the GMC Sonoma.  It is important to determine whether or not it’s a bad starter that is keeping the vehicle from turning over. If your Sonoma is not starting, don’t assume right away … Read more

GMC Sonoma: P0720 → OSS Circuit → Malfunction

P0720 is a generic OBD II trouble code, which means that it has the same meaning for your GMC Sonoma as it would any other vehicle.  It indicates that your Sonoma’s OSS (Output Shaft Speed Sensor) is reporting a malfunction. It’s typically caused by a bad OSS, or a wiring problem. The OSS works by … Read more

GMC Sonoma P0520: Oil Pressure Switch/Sensor → Circuit

  P0520 is a common OBD2 trouble code.  It’s generic, which means that it has the same meaning for the GMC Sonoma as it would any other vehicle.  P0520 indicates that the oil pressure sensor is operating outside of its normal “range”.  It is typically caused by a bad oil pressure sensor switch or a … Read more

GMC Sonoma P0108:  MAP Barometric Sensor → High Input 

  P0108 is a generic OBD-II trouble code.  It indicates your GMC Sonoma’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range.  The voltage is too high.  It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming into … Read more

GMC Sonoma P0443 Code: Meaning, Causes, How To Fix

P0443 is a very common OBD2 code.  It’s generic, meaning it has the same definition for the GMC Sonoma as any other vehicle.   If your Sonoma has this code, it indicates the EVAP purge control valve circuit is malfunctioning. This is typically caused by a short in the wiring to or from the purge … Read more