Hummer H3: High Oil Pressure → Causes + Diagnosis

If your Hummer H3 is experiencing unusually high oil pressure, you need to find out what’s causing it right away. Unusually high oil pressure can indicate serious problems, such as a blocked oil passage, or a broken pressure relief valve.  It should be treated like you have no oil pressure until you verify what is … Read more Hummer H3: High Oil Pressure → Causes + Diagnosis

Hummer H3 P0336: Crankshaft Position Sensor “A” Circuit Range/Performance

The Hummer H3 utilizes a crankshaft position sensor (CKP) in order to regulate the engine timing. This sensor uses a reluctor to gauge the position of the crank. When the H3’s ECM determines that the signal coming from this sensor is out of range, it’ll throw the P0336 trouble code.  P0336 is most commonly caused … Read more Hummer H3 P0336: Crankshaft Position Sensor “A” Circuit Range/Performance

Hummer H3 P0125: Insufficient Coolant Temp for Closed Loop Fuel Control

P0125 is a generic OBD-II code.  If your Hummer H3 has registered it, means that the ECM/PCM is getting a signal from the engine coolant temperature sensor (ECT) that the engine is not warm enough to enter closed loop fuel control.  P0125 is usually caused by a bad thermostat, low coolant, or a bad ECT … Read more Hummer H3 P0125: Insufficient Coolant Temp for Closed Loop Fuel Control

Hummer H3 P0191:  Fuel Rail Pressure Sensor → Circuit “A” → Range/Performance

  P0191 is a common OBD-II code.  It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range.  This is a generic code, which indicates that it has the same meaning for the Hummer H3 as it would any other vehicle.     P0191 is typically caused … Read more Hummer H3 P0191:  Fuel Rail Pressure Sensor → Circuit “A” → Range/Performance