Transmission control module failure????

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May 29, 2021 | 02:53 PM

Hummertyler

Thread Starter

Junior Member

Joined: May 2021

Posts: 1

Transmission control module failure????

Hey yall I just finished replacing the radiator ps pump, ps pulley,AC compressor, and alternator and it acts like its in limp mode no DIC lights on say for the traction and stabilitrak crap 2006 hummer h3 181000

May 30, 2021 | 01:54 AM

Happy Hummer

Senior Member

Joined: Oct 2011

Posts: 1,655

From: Wisconsin

Have you tested each wheel speed sensor and corresponding harness? Also, check the harness for your TCM . When say test you'll need to back probe.

Jun 1, 2021 | 08:47 AM

Doc Olds

Super Moderator

Joined: Jul 2007

Posts: 13,090

From: Boat Town USA MI

The 2006 and 2007 H3s do not have a TCM, the Transmission is controlled by the PCM in those year H3s.

In 2008 GM used a different PCM and added a TCM for 2008-2010s.

Do a scan with a scanner, not a code reader.