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Hummer
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2008
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H2 4D Utility Wagon
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Repair and Diagnosis
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Transmission
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Automatic Trans
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Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971
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DTC P0601, P0602, P0603, P0604, or P1621
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Circuit/System Testing
Circuit/System Testing
Reprogram the TCM and recheck for DTCs.
If the DTC resets, replace the control solenoid (w/body and TCM) valve assembly.