Cruise Control Disengaging
Thread Starter
Instructor
Joined: Apr 2012
Posts: 168
Likes: 26
From: San Lorenzo CA
Cruise Control Disengaging
I was on my way to work and the cruise control on my 2004 coupe disengaged twice on its own. Any thoughts as to why and what to check? I pulled the codes and there were none.
Thanks
Thanks
Melting Slicks
Joined: Jul 2013
Posts: 2,012
Likes: 23
From: Anaheim CA
Manual? It will disengage when the clutch is depressed, but I don't know how sensitive it is. It may be triggering if you're resting your foot on the pedal in traffic, or even just nudging it from the side with your foot. EDIT: it's a normally-closed switch on the clutch pedal bracket: check the connector to it.
It will also disengage if you speed up past the set point (e.g. to pass) for more than 60 seconds.
It will also disengage if you speed up past the set point (e.g. to pass) for more than 60 seconds.
Last edited by Lee DeRaud; Apr 28, 2014 at 11:44 AM.
Thread Starter
Instructor
Joined: Apr 2012
Posts: 168
Likes: 26
From: San Lorenzo CA
Sorry, I forgot to mention it's an automatic. I wasn't in traffic. Just cruising about 70 mph and it just shut off. I hit resume and it picked right back up only to disengage about 4 miles later. Resumed once more and it was fine for the remaining 12 miles. ?????
Le Mans Master
Joined: Apr 2012
Posts: 7,815
Likes: 2,266
From: Brighton MI
Both the clutch pedal (if it's a manual) and the brake pedal have switches on them that interupt the cruise circuit as soon as the pedal is depressed. I would check the adjustment of those switches and their electrical connectors first.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Jul 2013
Posts: 2,012
Likes: 23
From: Anaheim CA
I wouldn't start replacing parts until some codes trigger. According to the FSM, cruise control will disengage if the ABS/TC (and presumably AH as well) activates for more than 2 seconds. I can believe the SWPS can cause that, but there will be codes and symptoms unrelated to the cruise control to point you that way.
Team Owner
Joined: Mar 2004
Posts: 58,501
Likes: 1,828
From: Oklahoma City OK
C6 of Year Finalist (appearance mods) 2019
I wouldn't start replacing parts until some codes trigger. According to the FSM, cruise control will disengage if the ABS/TC (and presumably AH as well) activates for more than 2 seconds. I can believe the SWPS can cause that, but there will be codes and symptoms unrelated to the cruise control to point you that way.
Burning Brakes
Joined: Nov 2013
Posts: 1,036
Likes: 119
Mine usually does it when I hit a bump in the road. I'm positive I haven't touched a pedal, and no traction control lights come on. I think I do have a loose connection somewhere in the speed sensors on the hubs. Occasionally when tcs activated from lose gravel i get a service traction control warning until I restart the car. Could that have anything to do with it?
Melting Slicks
Joined: Jul 2004
Posts: 3,294
Likes: 482
From: Brea CA
The SWPS codes clear when the ignition is tuned off. Pull the codes after a cruise control disengagement after coming to a stop while the engine is still running.
90% chance it is the SWPS. It could be any of the wheel sensors or other ABS TSC sensors also. The most common one is the SWPS.
Takes about 2.5 hours to do. I would recommend pulling the steering column out completely when changing one.
First thing is to verify the codes generated.
Gary
90% chance it is the SWPS. It could be any of the wheel sensors or other ABS TSC sensors also. The most common one is the SWPS.
Takes about 2.5 hours to do. I would recommend pulling the steering column out completely when changing one.
First thing is to verify the codes generated.
Gary
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
I agree. Pull the codes and post them up. The trip is a symptom. You'll have an active handling problem that's causing it. In my case its a C1287/1288
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
Same here, mine would sporadically disengage cruise for years before the SWPS finally got bad enough to set a code. Swapped a new one in, and it hasn't done that since.
One thing you can try that narrows it down a little is to turn off AH/TC. If your cruise starts behaving normally with that off, then it's likely the SWPS and not the clutch/brake switches.
Last edited by wcsinx; Apr 28, 2014 at 03:48 PM.
Le Mans Master
Joined: Jan 2004
Posts: 9,488
Likes: 1,743
From: Knoxville Tn
Same here, mine would sporadically disengage cruise for years before the SWPS finally got bad enough to set a code. Swapped a new one in, and it hasn't done that since.
One thing you can try that narrows it down a little is to turn off AH/TC. If your cruise starts behaving normally with that off, then it's likely the SWPS and not the clutch/brake switches.
No they do not. They simple become history 'H' codes.
Again, my car behaved that way for a very long time before setting codes. The SWPS can send bad data that will cause the cruise to disengage, but it may or may not be far enough out of tolerance to set a trouble code.
