Hummer H1 P0451: EVAP Pressure Sensor → Range/Performance

Like all OBD-II trouble codes, P0451 has the same meaning for all vehicles.  It means that your Hummer H1‘s EVAP system has a pressure sensor that is malfunctioning in some way.  P0451 is usually caused by either a bad EVAP pressure sensor, a clogged fuel tank relief valve, EVAP lines, EVAP wiring, or a bad … Read more

Hummer H1 P0206:  Injector Circuit Malfunction – Cylinder 6

  P0206 is an OBD2 trouble code.  It indicates there has been a fuel injector circuit malfunction, in this case, it’s the 6’th cylinder in the firing order that is malfunctioning.  P0206 is a generic code, which means that it has the same meaning for the Hummer H1 as it would for any other vehicle. … Read more

Hummer H1 P0204:  Injector Circuit Malfunction | Cylinder 4

P0204 is an OBD II trouble code.  It means that you have a fuel injector with a circuit malfunction, specifically the fourth cylinder in the firing order).  It’s generic code, which means that it means the same thing for the Hummer H1 as it would for any other vehicle. When the PCM sees that the … Read more