Cruise Control
Thread Starter
Race Director
Joined: Apr 1999
Posts: 15,127
Likes: 476
From: NM
Cruise Control
Lately my curise control has been disengaging on its own. Does not happen often, but will be going down the interstate on curise and all of a sudden it will disconnect. The other day it did it twice in 20 miles.
What should I look for? Car is an '04 automatic.
tom...
What should I look for? Car is an '04 automatic.
tom...
Burning Brakes
Joined: Mar 2008
Posts: 983
Likes: 36
From: Middle Of Kali CA
Active Handling activation will cut it off. Many things can cause an activation I.E road surface, new tires, alignment ect. Let alone a mechanical issue......
Thread Starter
Race Director
Joined: Apr 1999
Posts: 15,127
Likes: 476
From: NM
Burning Brakes
Joined: Nov 2007
Posts: 951
Likes: 2
From: Rochester MN
The brakes are hydraulically adjusted so the peddle travel should stay the same.. Also, it's spring loaded to return to the stop...
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The Active Handling system can activate for a number of reasons. Some justified and some NOT. DTC codes can also help point to the problem.
The next time it kicks out, look at the DIC and note the message. If it says Active Handling Active,,,thats an issue.
Normally, the switch on the Brake Peddle gets out of adjustment and gets too sensitive. Any little bump or vibrations can trip it and shut down active handling.
The next time it kicks out, look at the DIC and note the message. If it says Active Handling Active,,,thats an issue.
Normally, the switch on the Brake Peddle gets out of adjustment and gets too sensitive. Any little bump or vibrations can trip it and shut down active handling.
Le Mans Master
Joined: May 2006
Posts: 7,802
Likes: 205
From: Hillsboro OR
The Active Handling system can activate for a number of reasons. Some justified and some NOT. DTC codes can also help point to the problem.
The next time it kicks out, look at the DIC and note the message. If it says Active Handling Active,,,thats an issue.
Normally, the switch on the Brake Peddle gets out of adjustment and gets too sensitive. Any little bump or vibrations can trip it and shut down active handling.
The next time it kicks out, look at the DIC and note the message. If it says Active Handling Active,,,thats an issue.
Normally, the switch on the Brake Peddle gets out of adjustment and gets too sensitive. Any little bump or vibrations can trip it and shut down active handling.
good advice. 
I just wanted to add the reason my CC was kicking out. The Steering Wheel Position Sensor was going bad and would randomly trigger Active Handling events that disengaged the CC.
Good Luck in the hunt.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
Even in a normally functioning C5, if you jerk the steering wheel the cruise control will go off.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Probably worth checking your codes as you may have an incipient active handling problem
Like Bluefire, I need a new SWPS fitting. My cruise control trips out when the AH has a glitch.
Like Bluefire, I need a new SWPS fitting. My cruise control trips out when the AH has a glitch.
Advanced
Joined: Jul 2012
Posts: 71
Likes: 12
From: Lansing Michigan
I was having the same cruise disengaging problem with my '01. Seemed very random - some days it would work fine. I checked all the grounds and sensor connections, SWPS, yaw, etc, nothing seemed to help. I was having a slow leak in my left rear tire - about 1 psi a day. I noticed that when the the pressure differential between the left front and left rear was more than 3 or 4 psi the cruise would disengage and also the left front brake would come on for a split second. Must be enough diameter change to trigger the AHS. I now check the tire pressures every day and keep them as close to 30 PSI cold as possible. Crusie is now working fine.
Le Mans Master
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C3 of Year Finalist (stock) 2019
C2 of Year Finalist (stock) 2019
Le Mans Master
Joined: Aug 2005
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From: CA.
St. Jude Donor '13-'14-'15
There are 2 ways that the ECM will release or unlock the converter
1st --and reported MISFIRE--whether real or fasle will unlock the TCC
2nd---Any tap on the brake pedal or short circuit on the brake switch will unlock the TCC
I've seen simply the floormats cause this before-
Many modded engines create false misfires--just the nature of the beast-the only way to eliminate the false misfires is to disable or desensitize them in your tune
1st --and reported MISFIRE--whether real or fasle will unlock the TCC
2nd---Any tap on the brake pedal or short circuit on the brake switch will unlock the TCC
I've seen simply the floormats cause this before-
Many modded engines create false misfires--just the nature of the beast-the only way to eliminate the false misfires is to disable or desensitize them in your tune
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Check the PROPER operation of the BRAKE & CLUTCH micro switch adjustments!! If there wrong,, it will affect cruise control operation.. Both switches should be fully compressed and CLOSED for proper operation. When the brake or clutch is depressed, it should disengage cruise.
BC,
BC,
