Have fault code P0128, H3 running normal except for check engine light being on.
120

Asked by Psalm Oct 31, 2011 at 11:23 AM about the 2006 Hummer H3 4dr SUV 4WD

Question type: Maintenance & Repair

2 Answers
140

Chrissy answered 12 years ago

Possible defective thermostat. Read that the computer looks for temps around 195-215 after a certain time. Though your gauge may read fine, it still may be the issue.

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