Mt CTS t/c shows up on the screen and the reduce.

Tiny
RAMONKM
  • 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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Thursday, October 18th, 2012 AT 7:53 PM

13 Replies

Tiny
SATURNTECH9
  • EXPERT
  • 31,056 POSTS

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.

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Thursday, October 18th, 2012 AT 7:57 PM
Tiny
RAMONKM
  • MEMBER

Thanks I'll get back to you with the codes.

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Thursday, October 18th, 2012 AT 8:07 PM
Tiny
SATURNTECH9
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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.

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Thursday, October 18th, 2012 AT 8:11 PM
Tiny
RAMONKM
  • MEMBER

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

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Wednesday, October 24th, 2012 AT 10:38 PM
Tiny
SATURNTECH9
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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?

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Thursday, October 25th, 2012 AT 11:28 PM
Tiny
RAMONKM
  • MEMBER

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.

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Saturday, October 27th, 2012 AT 12:38 AM
Tiny
SATURNTECH9
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With doing some testing cant really answer those questions.

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Saturday, October 27th, 2012 AT 2:02 AM
Tiny
RAMONKM
  • MEMBER

When get the mutimeter where should start testing and what should I be looking for?

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Saturday, October 27th, 2012 AT 8:43 PM
Tiny
SATURNTECH9
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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.

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Saturday, October 27th, 2012 AT 11:57 PM
Tiny
RAMONKM
  • MEMBER

Sorry I meant I replaced the throttle pedal sensor.

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Sunday, October 28th, 2012 AT 1:24 AM
Tiny
SATURNTECH9
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Oh ok to diagnose the code P0221 whjch is where I would start with the codes you need scan tool that can read tps readings etc and a multi meter.

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Monday, October 29th, 2012 AT 4:33 PM
Tiny
RAMONKM
  • MEMBER

Guess what I found out the problem, when I remove the harness wire form the tps I notice that there are 6 prongs inside and two were bent, once I straighten them up and places the harness back in carefully it ran perfect.

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Tuesday, December 11th, 2012 AT 10:51 PM
Tiny
SATURNTECH9
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Wow you got lucky on that one I wonder how they got bent?Glad to hear you found the problem.

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Tuesday, December 11th, 2012 AT 11:24 PM

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