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Buick Rendezvous CX: I have a 2003 Buick rendezvous ...all…

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I have a 2003 Buick...
I have a 2003 Buick rendezvous ...all wheel drive is disabled and car drives in limp mode what may cause this ....no codes
Submitted: 3 years ago.Category: Buick
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Answered in 10 hours by:
6/7/2015
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
FIXITMAN
FIXITMAN, Master Technician
Category: Buick
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello, my name is***** for the question. If I am not online when you return please give me some time to get back to you. Can you tell me if the vehicle appears to always be in this mode or does it drive fine for a while prior to this occurring?
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Customer reply replied 3 years ago
It is always in this mode.....
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
Thank you. Is the check engine light actually turning on? Will the scan tool communicate with the computer?
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Customer reply replied 3 years ago
No there is no check engine light and yes my scan tool does communicate with the car
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
If it is going into limp mode then the computer should be issuing a problem code as to why. If it is not then you may have an ECM failure. One other thing that will cause this is a voltage issue. If the battery is low or if the alternator is not charging then this will occur also.
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Customer reply replied 3 years ago
I found a loose ground on the negative battery cable tightened it up check for charging everything is charging okay taken for a ride for about 25 feet the all-wheel-drive was out then I found a loose ground on the negative battery cable tightened it up check for charging everything is charging okay taken for a ride for about 25 feet the all-wheel-drive was out it came on... I was able to check historic codes and it had both front wheel sensors out which I assumed was repaired because I didn't have any active engine light codes.... Any other suggestions????
Customer reply replied 3 years ago
Battery is fully charged and holding....
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
Does your scan tool have the ability to read the live data from the front wheel sensors?
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Customer reply replied 3 years ago
Yes it does I'll try reading it tomorrow....then go from there
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
Let me know what you find. I would be interested to know if they are reading the same as the rears.
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Customer reply replied 3 years ago
Sorry it took so long to reply... All readings are the same or normal so
Battery is good, all sensors are working properly and read normal any other suggestions???
Buick Mechanic: FIXITMAN, Master Technician replied 3 years ago
Thanks for getting back to me. So when the lights turns on all 4 wheel speed sensors are reading exactly the same speed? If they are then you may have a faulty connectin at the brake control module or the module itself may be failing.
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