For the last 4-5K miles I have been experiencing intermittent problems with the cruise control on my Avalanche [now ~39K miles on it I know I should have taken it in immediately when problems started].
I've read most of the posts on cruise control problems and I don't have brake light or dash problems. The cruise light on the switch lights up no problem when the cruise is activated. However, when trying to engage the cruise nothing happens. Some times, if I'm lucky, and only after starting the truck it will work once. But cancel the cruise and then it won't work again.
Now most of the time the cruise will not work at all.
I have to say this really peaves me given I used to use it almost all the time driving to keep my mpg up.
Does anyone have any suggestions?
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We have the exact same problem on a 2008 Silverado 2500 HD 2wd ext cab. I dont have any suggestions other than this is the first post i have seen that matches our problem exactly. I hope someone can answer this one.
On rare occasions, some customers may comment that the cruise control turned off. This typically occurs during operation and while pulling up and releasing both driver door window switches or activating the heated windshield washer fluid system in cold weather conditions with a battery charge below 80%.
Cruise control command cancellation is caused by a voltage spike that occurs when the driver door window switches are released or when the heated washer fluid system is activated.
A revised calibration has been developed to address this condition. Technicians are to reprogram the ECM with the latest calibrations available. This new service calibration is available on TIS2WEB using the Service Programming System (SPS). Refer to the SPS procedures in SI. SPS may require the technician to select the calibration from the ECM calibration screen.
This calibration update should only be used when this loss of cruise control condition is experienced.
When using a Tech 2(R) or a multiple diagnostic interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 volts. Only use the approved Midtronics(R) PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming
ASE Master Tech, L1 Advance Engine Performance certified
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.
I took my Avalanche to the local dealer [Buckalew Chevrolet, Conroe, TX] and they took care of three issues I had. First was the heated washer fluid recall, second was a faulty Left/Rear electric door latch mechanism [that's now three of the four that have been replaced] and finally the cruise control problem.
First I should say my Avalanche was ~3-4K out of warranty. A major thank you to Buckalew for performing all the work for free under their "good will" policy.
Finally, the Buckalew service associate said the cruise control problem was a faulty break switch. They went ahead and reprogrammed the ECM per the technical Bulletin No.: 09-08-68-001. I've been driving the Avalanche for a day or two and so far no cruise control problems.
My truck has a cruise control problem also, it turns on when it wants, and I have only used it a handful of times in the past. Very frustrating since it has only 46k on it. Dealer gives the same answer of we can charge to check it and if you don't use it much it should not be a problem. Great.
I brought my truck to a dealer that would not charge $89 to look at, and it was the brake switch that was bad. It seems to be a consistent problem for this truck. It cost me $140 to fix. Im sure that is your problem. Part number 15861245 BPP sensor failure according to my receipt. $110 for labor, $22.16 for part. It took 1/2 hour to have fixed. Not bad for a half hours work for the dealer, but still cheaper than an extended warranty!