03 - 05 Hummer H2 DTC C0660 and C0712 After Changing Suspension Compressor - kw air height module trim

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

You may encounter a " SERVICE AIR SUSPENSION " message after replacing the Air Suspension Compressor Assembly from a single stage compressor to a dual stage compressor. The Suspension module may also have a current or history code C0660 and/or C0712.

When replacing the Air Suspension Compressor from a single stage to a dual stage. Do not SPS program the replacement module that comes with the new dual stage compressor. The new module comes preprogrammed and a trim height calibration is the only thing needed after replacement. The trim height calibration can be found in the Tech 2 scan tool under Chassis / Air Suspension / Special Functions.

Note: If a Air Suspension Control module is SPS programmed on a dual stage compressor and the following codes listed above are set, the module will have to be replaced.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

(03-05 H2 Hummer)

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