Codes for 92 Vette
Thread Starter
Racer
Joined: Jul 2014
Posts: 266
Likes: 20
From: Philadelphia Pa
Codes for 92 Vette
Hey all, sort of a silly question but my FSM doesn't get here until monday and I would like to get a jump start on the work if I can. I checked my dormant engine codes since I have a "service engine soon" that comes on intermitantly. When I pulled the codes via jumping the ODB connector I got the following.
Module 1: C 12 (which from my googling means no codes)
Module 4:
H55 which I've gotten conflicting results about whether it's running lean or that it's a fuel delivery issue. I assume they'd be the same issue now that I think about it.
H63 - O2 correct?
H64 - O2 but down stream?
Just looking for some troubleshooting advice. It's not steady so I think it's just a plug issue on the O2 sensors.
Worth noting that the EVAP Vacuum Supply hose was split right at the throttle body and I fixed that today. Haven't taken her for a spin but wasn't sure if that could be part of the contributing issue or not.
Thanks for any help!
Module 1: C 12 (which from my googling means no codes)
Module 4:
H55 which I've gotten conflicting results about whether it's running lean or that it's a fuel delivery issue. I assume they'd be the same issue now that I think about it.
H63 - O2 correct?
H64 - O2 but down stream?
Just looking for some troubleshooting advice. It's not steady so I think it's just a plug issue on the O2 sensors.
Worth noting that the EVAP Vacuum Supply hose was split right at the throttle body and I fixed that today. Haven't taken her for a spin but wasn't sure if that could be part of the contributing issue or not.
Thanks for any help!
Race Director
Joined: Oct 2011
Posts: 16,079
Likes: 816
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
From my 93 FSM.
DTC 55: Fuel lean monitor. Step one says if codes 44 or 64 are present, start with those first.
DTC 63: O2 sensor open circuit
DTC 64: Right o2 sensor lean.
You need a scan tool for codes 63 and 64
DTC 55: Fuel lean monitor. Step one says if codes 44 or 64 are present, start with those first.
DTC 63: O2 sensor open circuit
DTC 64: Right o2 sensor lean.
You need a scan tool for codes 63 and 64
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
See the definitive ECM fault code list here:
https://www.corvetteforum.com/forums...post1576116036
Thread Starter
Racer
Joined: Jul 2014
Posts: 266
Likes: 20
From: Philadelphia Pa
good advice, which my brain seemed to just ignore when originally thinking about this. It'll point the finger to exactly what's making the intermittent code too hopefully. However after doing a little more reading I think these three are pretty inter-twined
