Revisit to crazy tpms and bcm issues
08-06-2016, 06:04 AM
#1
Revisit to crazy tpms and bcm issues
UPDATE SO THIS ISSUE IS BACK LAST WEEK DRIVING IN HEAVY RAIN BAM TPMS AND TIRE PRESSURE IDIOT LIGHT COME ON. SO THE LAST TIME THIS HAPPENED I WENT TO THE DEALER BECAUSE IT HAPPENED 2 TIMES BEFORE. THE FIRST TIME I FIGURED IT WAS JUST ELECTRICAL GREMLINS. THE SECOND TIME IT HAPPENED TOOK THE CAR TO THE DEALER. THEY COULD NOT FIND ANYTHING BECAUSE THE BCM RESET ITSELF. THEY TOLD ME THAT WAS NOT POSSIBLE THERE SHOULD BE SOME CODES. WELL THIS TIME I GOT ON STAR AND THEY DID A DIAGNOSIS WHILE I WAS DRIVING. HERE ARE THE CODES THEY PULLED UP. THIS IS A READ OUT FROM AN EMAIL I RECIVED FROM THE DEALER WHICH ON STAR SENT THEM Repair Services:
Tell Us More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
1ST TIME So yesterday i washed my car. Same as i have done many times before. Anyway i finish cleaning the inside after i dry the entire outside. I finish off with my usual tire dressing and the car looks great. I go to lock the car and FOB is not working. So i keep pushing the FOB no response. I go get my spare FOB same condition. Now i know it is not the batteries. So now i am conserned that the car will not start. So i get in the car and she starts. I take the car out and 2 blocks from the house i get a message on my cluster Tire Monitoring System. Then i get the flashing tire so i scroll through my settings and sure enough blank pressures. I need gas so i go to my regular gas station 3 miles away. I was hesetent about shutting down the car but i knew i and to to fill up. I fill up the car starts i get the flashing tire and TMS message. Then the TMS message disappears the flashing tire goes out. I get home and just for my curiosity i leave the FOB in the car and Bam i get the beeps letting me know i have left the FOB in the car and now the car is back to normal WTF!!!! Anyone have an answer for this strange occurrence?
Last edited by jyounger74; Today at 05:27 AM.
Tell Us More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
1ST TIME So yesterday i washed my car. Same as i have done many times before. Anyway i finish cleaning the inside after i dry the entire outside. I finish off with my usual tire dressing and the car looks great. I go to lock the car and FOB is not working. So i keep pushing the FOB no response. I go get my spare FOB same condition. Now i know it is not the batteries. So now i am conserned that the car will not start. So i get in the car and she starts. I take the car out and 2 blocks from the house i get a message on my cluster Tire Monitoring System. Then i get the flashing tire so i scroll through my settings and sure enough blank pressures. I need gas so i go to my regular gas station 3 miles away. I was hesetent about shutting down the car but i knew i and to to fill up. I fill up the car starts i get the flashing tire and TMS message. Then the TMS message disappears the flashing tire goes out. I get home and just for my curiosity i leave the FOB in the car and Bam i get the beeps letting me know i have left the FOB in the car and now the car is back to normal WTF!!!! Anyone have an answer for this strange occurrence?
Last edited by jyounger74; Today at 05:27 AM.
Last edited by jyounger74; 08-06-2016 at 06:06 AM.
08-06-2016, 08:55 AM
#2
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
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bad ground
bad bcm
dealer needs to be able to print codes to do a warranty claim, without them GM won't authorize it.
call Chevrolet customer care and get them to help you get a warranty claim opened and work started. a bad ground could be difficult (time consuming) to find.
bad bcm
dealer needs to be able to print codes to do a warranty claim, without them GM won't authorize it.
call Chevrolet customer care and get them to help you get a warranty claim opened and work started. a bad ground could be difficult (time consuming) to find.
08-06-2016, 09:00 AM
#3
bad ground
bad bcm
dealer needs to be able to print codes to do a warranty claim, without them GM won't authorize it.
call Chevrolet customer care and get them to help you get a warranty claim opened and work started. a bad ground could be difficult (time consuming) to find.
bad bcm
dealer needs to be able to print codes to do a warranty claim, without them GM won't authorize it.
call Chevrolet customer care and get them to help you get a warranty claim opened and work started. a bad ground could be difficult (time consuming) to find.
Last edited by jyounger74; 08-06-2016 at 09:00 AM.
08-06-2016, 10:44 AM
#4
Race Director
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Location: Texas Hill Country
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call customer care
08-06-2016, 02:36 PM
#5
Le Mans Master
Could be as simple as a marginal battery. They can cause all kinds of weird computer issues that come and go. Simple to spot, take it to a local auto parts store and they will put it on their tester for free.
08-06-2016, 02:44 PM
#6
Moderator/Tech Contributor
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Location: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
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2015 C7 of the Year Finalist
Not to nit pick, but ALL CAPS is annoying to the reader.
Bad Ground or BCM would be my first guess too.
Elmer
Bad Ground or BCM would be my first guess too.
Elmer
08-06-2016, 03:07 PM
#7
Race Director
The TPMS (Tire Pressure Monitor System) is actually part of the RCDLR module (Remote Control Door Lock Receiver module).
It sounds like you have a problem with the RCDLR because it's giving you both fob operation problems as well as TPMS problems.
As mentioned, it's probably something as simple as a loose ground in the RCDLR system. I don't know where it is in the C7 (it actually has wires and components going all over the place), but in the C5 and C6 the main RCDLR box is up over the left rear tire. I have gained access to that area in my C6 through the hatch. I'd look in there to see if everything seems securely mounted and any wires going to ground are securely attached.
.
It sounds like you have a problem with the RCDLR because it's giving you both fob operation problems as well as TPMS problems.
As mentioned, it's probably something as simple as a loose ground in the RCDLR system. I don't know where it is in the C7 (it actually has wires and components going all over the place), but in the C5 and C6 the main RCDLR box is up over the left rear tire. I have gained access to that area in my C6 through the hatch. I'd look in there to see if everything seems securely mounted and any wires going to ground are securely attached.
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