I think my tcm has gone bad. My 08 is an SS and the pull a parts around here don't have an SS. Will the Lt tcm be a direct replacement or does it need reprogrammed? Or if I just buy a new one from autozone will it need to be programed?
Gr8hallafamer
You'll likely need to program a replacement.
Have you checked power and ground connections to the TCM?
Have you looked at the Class II databuss signal with a scope?
Have you checked power and ground connections to the TCM?
Have you looked at the Class II databuss signal with a scope?
Dr Shock video. SAE J2534 AC Delco service programming with a laptop and Blue GM Bosch MDI
You can buy a single VIN service programming license for @ $40 Yankee bucks
Viewing Class II Data signal with a scope. You will not get any meaningful information from a multimeter.
You can buy a single VIN service programming license for @ $40 Yankee bucks
Viewing Class II Data signal with a scope. You will not get any meaningful information from a multimeter.
P0700 means is the TCM isn't communicating or is sending dodgy data.
No power and No / damaged Comms connection are the first place I look. If one or both are not OK then a good TCM can't talk. Much cheaper to fix corroded, broken, or chewed wire(s) or bad ground(s) than replacing a controller.
There are several power and ground wires on the ECM. I'd have to look at the TCM wiring diagram but don't count on only one pair of power wires.
Comms are twisted wires.
Use a tungsten filament bulb to test power and ground. A meter is low impedance so it'll show 12v when the wire is corroded or damaged enough that it won't carry enough current to light a 168 series peanut bulb.
No power and No / damaged Comms connection are the first place I look. If one or both are not OK then a good TCM can't talk. Much cheaper to fix corroded, broken, or chewed wire(s) or bad ground(s) than replacing a controller.
There are several power and ground wires on the ECM. I'd have to look at the TCM wiring diagram but don't count on only one pair of power wires.
Comms are twisted wires.
Use a tungsten filament bulb to test power and ground. A meter is low impedance so it'll show 12v when the wire is corroded or damaged enough that it won't carry enough current to light a 168 series peanut bulb.
Fuse blowing without the TCM plugged in means you have a short to ground between the TCM and the fuse panel.
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