Question about 2004 Hummer H2
You would have to use a OBDII scanner to clear the light. There is a connector under the driverside of the dash to connect the scanner to. If a problem exists, the light would just come back on. For the change oil light all you have to do is turn the key on, but don't start engine. Press the gas pedal all the way to the floor 3 times within 5 seconds and that resets that light. Some Hummers have menu controls on the steering wheel to reset the oil light. But as far as a Check Engine Light, you may need to have your vehicle checked out. Local part stores like Autozone could check what trouble codes are in the system to see why the light is on. Don't know if they can clear them for you. Misfires, bad oxygen sensors, lean/rich fuel mixture are just a few examples of what can turn that light on.
Posted on Dec 29, 2010
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Posted on Jan 02, 2017
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When you replaced the cap, did you reset the "check engine" light. The problem codes stay in the memory until you reset them. To reset, you can disconnect the battery or remove the fuses that power the computer. The fuses will be marked, with CP or ECH or some similar marking. They may have a number behind it. You can take all these fuses out for about 5 minutes or disconnect the battery for 5 minutes. When you restart watch the light, it should be out. If it comes back on in the first minute or so you still have a problem. Check the code again. Likely the light will stay off once you reset it.
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