From the Shop Floor: The H3 That Wouldn’t Shift
From the Shop Floor: The H3 That Wouldn’t Shift
I had a 2009 Hummer H3 roll into my bay last month that had its owner completely stumped. The truck would randomly refuse to shift out of 2nd gear and was throwing a generic P0700 transmission fault code. The owner had already replaced a shift solenoid with no luck. After connecting my scan tool, I noticed intermittent communication drops with the TCM. Instead of a complex internal transmission problem, the evidence pointed to a faulty module. We installed one of our VIN-programmed T42 units, and in less than an hour, the H3 was shifting perfectly. It’s a classic case where the simplest fix is the right one, saving the customer from an unnecessary and costly transmission rebuild.
Frequently Asked Questions
Do I need to have this module programmed by the dealer?
No. We handle all the programming for you. This 2008-2010 Hummer H3 TCM is programmed to your vehicle’s VIN before shipping, so it’s ready for immediate installation right out of the box.