Diesel Place : Chevrolet and GMC Diesel Truck Forums - View Single Post - Limp mode only when towing otherwise fine, HELP
View Single Post
Old 04-29-2019, 09:57 AM   #5 (permalink)
Diesel Boss
G2GBY's Avatar
Join Date: Aug 2017
Posts: 1,245

P0700 is the TCM requesting a MIL (Malfunction Indicator Light aka: "check engine"). All the 700 code does is tell the ECM "something's wrong" and to illuminate the MIL. There is another code in the TCM that you need to pull that will actually tell you what the malfunction is so.

Like said above I go to a local parts store to have code read for free. If one place can't read it I go to another. Seems like there all stack up in a row by us.

Report back with code.

Last edited by G2GBY; 04-29-2019 at 10:00 AM.
Offline   Reply With Quote