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2003 Cadillac CTS engine

Tiny
FLYEYES
  • MEMBER
  • 2003 CADILLAC CTS
  • V6
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I was at a stop light today and engine sound started to pulse like it had a low idle. I began to drive and it started to drive odd. As I was driving car shifted weird or stuttered. Then computer screen reads engine speed/power reduced and the car only drove like 5 mph no matter how much gas was given. I pulled over and restarted car. It went back to driving ok except when coming to a stop. Slowing down under 20 its either downshifts weird or stutters a bit like there is a problem. Any info on this is much appreciated.
Thank you
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Friday, April 3rd, 2015 AT 4:45 AM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and clean throttle plate on both sides with choke cleaner and iac hole. Auto parts may be able to scan it otherwise a pro may have to.
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Friday, April 3rd, 2015 AT 7:25 AM
Tiny
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  • MEMBER
  • 20 POSTS
I read codes from car on compuer and just the ecm codes are P2135 H, P0160 C, P2176 H, P0700 C, P0161 C, P1629H. I other codes such as sdm codes, PHN, MSM, EBC also. I havent cleared codes from past because I was afriad I might not get these codes back for this for a few days. I have stability control error, that was fixed, seat motor code but other than that. I am trying to find codes online. Any help with these or you need more let me know. Thanks
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Friday, April 3rd, 2015 AT 10:55 AM
Tiny
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  • MEMBER
  • 20 POSTS
I am leaning toward the throttle body. I see 2 available at places. One that is $100 and says "may need to do relearn process" and the other is $250 but no relearn. Why does one say it and one doesnt? Will I have to do it on both?
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Friday, April 3rd, 2015 AT 11:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
With all thcodes you are getting check battery for condition as a low battery can do this. Check for condition including load test. Then clear codes an drescan see if they all com eup again.
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Friday, April 3rd, 2015 AT 11:59 AM
Tiny
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  • MEMBER
  • 20 POSTS
Scan from auto zone:
p1779, p1795, p0161, p0160, p0700

what I find from this is 1779 is tcm
1795 is throttle position sensor,
0161 & 0160 is o2 sensors
0700 is more tcm?

While looking these up I come across ppl saying to replace throttle body. Also ppl try all these things and find that nothing is working. Idk. Any thoughts would be greatly appreciated.
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Thursday, April 9th, 2015 AT 11:53 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have you checked the battery for condition like I said and tried cleaning throttle plate on both sides and iac hole with choke cleaner? 700 is a trans code 160 and 162 are the same heater so it can be a broken wire, connection or bad O2 sensor. It's bank 2 behind converter which would be pass side. You may have the 700 codes from other codes. A pro shold ook at the car if the 1779 stays as tcm and ecm have a torque signal problem.
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Thursday, April 9th, 2015 AT 12:03 PM
Tiny
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  • MEMBER
  • 20 POSTS
Battery is pretty new like 6 months or less. I cleaned throttle body.

(160 and 162 are the same heater so it can be a broken wire, connection or bad O2 sensor.) Did you mean seat heater or same heater? Also its a sensor for heater or O2? These are way two other things. The car keeps dying usually at idle, so ill replace the o2 sensor that you say it could be.
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Monday, April 13th, 2015 AT 6:01 AM
Tiny
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Also if I replace o2 sensor, is it a plug and play or do I need to get Cadillac to program them too?
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Monday, April 13th, 2015 AT 6:16 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
All sensor are just remove and replace same with throttle body normally the only thing that needs a pro are modules and gas pedals. Make sure O2 sensor has anti-seize on the threads.
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Monday, April 13th, 2015 AT 7:19 AM

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