GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Were you sent here from a diagnostic table?

--

Go to Step 2

Go to Electric Shift Transfer Case Functional Test

2

Perform a diagnostic on the TCCM. Go to Obtaining Diagnostic Trouble Codes (DTC).

Are any diagnostic trouble codes stored?

--

Go to the DTC Diagnostic Procedures

Go to Electric Shift Transfer Case Functional Test