Mechanics

CADILLAC CTS ENGINE PROBLEM

2003 Cadillac CTS • 87,000 miles

Mt cts t/c shows up on the screen and the reduce engine speed pops up after that then it's followed by my transmission shifting hard and making a loud sound, can yo help please?
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Ramonkm
October 18, 2012.



Your going to have to have all the computers in your car scanned for codes and get the exact code numbers you have. Its not going to be a easy diagnoses most likely.

Saturntech9
Oct 18, 2012.
Thanks I'll get back to you with the codes.

Tiny
Ramonkm
Oct 18, 2012.
Alright make sure you have it scaqanned with more then just a basic diyer scan tool that can read all the computers and not just the engine and transmission ones.

Saturntech9
Oct 18, 2012.
Hey sorry to get back so late to you but here are the codes here goes.
P2176
P0638
P2135
P0121
P0221
P2119
B00652
P1779
P1917
B2019
B15a0

Tiny
Ramonkm
Oct 24, 2012.
You have a ton of throttle postion coedes and throttle circuit codes plus some codes I cant find that exist for that car. Lets start with the code P0221. Do you have a multimeter to do some testing?

Saturntech9
Oct 25, 2012.
I don't but my mechanic may, is
There an electrical problem as well like the engine harness wire? Do you think I need a new throttle body cause I change the throttle position sensor already and I had the computer relearn it to calibrate it.

Tiny
Ramonkm
Oct 27, 2012.
With doing some testing cant really answer those questions.

Saturntech9
Oct 27, 2012.
When get the mutimeter where should start testing and what should I be looking for?

Tiny
Ramonkm
Oct 27, 2012.
How did you replace the tps when its part of the throttle body?You will also need a scan tool that reads livew data to monitor the tps readings for the first part of the test.

Saturntech9
Oct 27, 2012.
Sorry I meant I replaced the throttle pedal sensor.

Tiny
Ramonkm
Oct 28, 2012.
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