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2003 Cadillac CTS Engine

Tiny
RAMONKM
  • MEMBER
  • 2003 CADILLAC CTS
  • 87,000 MILES
Sometimes in the morning my car would rev up hard or the rpm would fluctuate when turned on, I was told that the reset the throttle body and I did but it happens from time to time, also my transmission shifts out and down pretty hard as well, it does it around the first and second gear, when slowing down if feels as if it doesn't know what. Gear it's in. Recently I had it scan and these are the codes that came up.
Po700
Po507
Po420
P2121
P2135
Some help is gravely appreciated!
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Tuesday, July 9th, 2013 AT 3:03 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Code 420 is a clogged converter or one that is going bad air leak, or maybe an O2 sensor. For code 507 try cleaning throttle plate on both sides with choke cleaner first it may be sticking then check for vacuum leaks and all hoses connected. The code 700 may be an engine problem causing that code. There is no code 2121 the code 2135 may be the cause of the throttle plate sticking a bad tps or a short in wiring or a bad throttle body assembly
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Tuesday, July 9th, 2013 AT 4:30 PM
Tiny
RAMONKM
  • MEMBER
  • 17 POSTS
Thanks again, you guys are very consistent.
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Thursday, July 11th, 2013 AT 6:28 PM

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