Q: Locating TCM on 2000 saturn ls2

asked by on

Well, I had to do an alternator change on my 2000 saturn ls2..

Without a working alternator, and a fully charged car battery (by charger) I drove 2 miles or so to a place where I could work on it. I should mention that the car lost almost all power and shifting capabilities right before I got there. (battery was garbage) Now I get a code saying that I have no comms with the TCM to the ECM even with my new alternator in and I think my car is stuck in limp mode.. I tried an ECM reset, B+ fuse pull and I'm about to change the tranny fluid filter.. But I doubt the filter is to blame... And the shifting problems are slightly intermittant but 80% limp mode. Could it be the weak, half-bum battery? I put a slightly better battery in and got 3rd gear, an improvement from stock battery only giving me second gear...but still no overdrive.. If all suggestions fail, where is this TCM? Codes are p1511 and u2106. Thanks a ton

My car has 200000 miles.
My car has an automatic transmission.

The TCM is in the right rear of engine compartment. The first thing to check after putting in a new good battery and checking the charging system is to see if any fuses are blown for the TCM. The engine is in a failure mode and may need to have codes cleared after checking fuses. If problem with TCM continues then you will need to have it checked for power to module and may need new TCM.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Locating TCM on 2000 saturn ls2

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When i drive my car over 60 miles my car start shakig

Vibration at speed is usually due to dynamic imbalance of the wheel/tire assembly and/or a rim is bent. Even stronger vibration on braking can mean that the brake rotors are warped as well. Certain tire defects, particularly internal belt damage...

Q: Q: Crack in oil pan

Hi there. A crack in the oil pan will definitely cause a substantial leak on any engine. The most common leaks on this engine are the front and rear seals, but those are not typically too bad. If an oil...

Q: Have oil on one of my spark plug wires in the spark plug well the test are fine. What should I do.

Hi there. The issue that you are having is a small o-ring seal on your valve cover is either split or damaged. The valve cover should have a seal all the way around it and 4 o-rings in the middle...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.