bring_1
10+ Year Contributor
- 40
- 0
- Jan 20, 2010
-
Madison,
Wisconsin
I've got a 97 Tsi AWD Auto. Go to drive it one day and i've got nothing but 3rd and reverse. It's in limp mode. Also when reving the engine the A/T temp light comes on dimly. So far I've tried checking all the plugs on the trans, they're not mismatched the car was driving fine as is and all are still connected. Pulled tcu codes and got no signal. Ran CEL codes at autozone, got P1600 Serial Communications Link failure. Checked for voltage into tcu, all fine there. Checked the wires that go between the ecu and tcu they were fine as well. Swapped with a working tcu. nothing changed. Where do I go from here?