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Discussion Starter · #1 ·
Starting getting Service ESC and Service Traction Control Lights also Brake Lights staying on intermittently. Then ESC off warning comes on.
ESC and Traction lights etc clear after engine restart. But then come on about once a day.
Dealer reported two codes C0900 and C0277 when doing diagnostics.
And 00 Device Voltage High History.

Dealer replaced failed brake position sensor today .Brake lights now ok but ESC and Service Traction Control lamp came on again this pm. Clear after restart same issue as before. I found title of a Technical Service Bulletin for a 2007 with ESC traction control light issue that said to reprogram one of the computers.

Anyone had similar issues? Did you find the cause?

Thanks
 

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Welcome to the forum. Someone should give you some advice soon.

Did the dealer check the fluid level in the brake res? No signs of contaminTion?

Did they verify the condition of the wheel sensers?
 

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Discussion Starter · #3 · (Edited)
Thank you for the reply . I will have the dealer check brake fluid and condition of wheel sensors when I take it back in.
Brake lights on when they should be off again. ESC service traction control and esc off shows up. Also noticed cruise control inoperative now.

When vehicle is cold started brake pedal very hard when first backing out of garage. When engine goes down to normal idle brake pedal feels normal.

Could the warning lamp conditions also be caused by wheel alignment being off as this might make the sensors think the vehicle is not tracking straight?
 

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That hard brake pedal at cold start is normal for the 08. Have you recently added wheel spacers to your car? I tried them on mine and it did exactly what you are describing. if not, might be worth removing the wheels, cleaning the hub and the back side of the wheel where it meets the hub and try it then.
 

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When vehicle is cold started brake pedal very hard when first backing out of garage. When engine goes down to normal idle brake pedal feels normal.
Welcome to the "brake flaw" on the 2008 GXP. :cuss: This is normal when first starting up the car, SOME of the 08' early build models work off of a vacuum brake assist pump and before the brakes will work properly, boost needs to build up. GM says this is normal for this type of set up. I personally hate it. They know it is a problem and went back to the 07' brake set up for the remaining late 08' build models and 09'-10' year model GXP cars. Many people have done the "retro fit" of the 07' brake set up which eliminates the vacuum boost assist. Until then the best solution is to just wait a few minutes for the car to idle or just give it a little gas and then the boost will build up making the brakes work as they should before you drive off in the morning. It's stupid, but the only way around it without the retro fitting. As for your other issue with the warning lights coming on, I don't have an answer.
 

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That hard brake pedal at cold start is normal for the 08. Have you recently added wheel spacers to your car? I tried them on mine and it did exactly what you are describing. if not, might be worth removing the wheels, cleaning the hub and the back side of the wheel where it meets the hub and try it then.
I have 2 wheels spacers on the rear of my car and never had any issues. Looks good too.
 

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yeah, I know some of you have spacers with no problems and then there are us that do. the ones I had stuck the wheels out more and it looked better but I was not happy with the amount of threads I had to work with so when I started getting all those alarms, I was releaved that i couldn't use them.
 

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Discussion Starter · #8 ·
Thanks to all posting replies on the hard brake pedal issue. Glad to know its " normal" At least now I know its probably not related to all the warning lights on the ESC.

Have done no mods to this car.

Still looking for answers to the service , ESC service Traction Control , and then ESC off issues. I did read where the cruise control auto disables when the ESC is actuating.

Going back to the dealer tomorrow to see what they find. Will ask for them to recal brake pedal position sensor.
 

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2008GXP,

Let me know if you need assistance while at the dealership. We can certainly reach out to your dealership's customer care specialist on your behalf.

Erica Tiffany
GM Customer Care
 

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I had the same issue last year. Turned out that I had a loose hose on the rear caliper that was leaking. Check that first!
 

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Discussion Starter · #11 ·
Erica, I am at Rosner Chev Melbourne Fl . They say I need a new BCM and flushing the brake fluid. Does that sound logical? I hope it fixes the problem. This is my second trip for this issue. They are crediting me back some $ from the first visit. But going to be over $400.
They need to get the part but say it will be in today.
 

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Thanks to all posting replies on the hard brake pedal issue. Glad to know its " normal" At least now I know its probably not related to all the warning lights on the ESC.
Yes, but here is the BIG problem with the brakes on the early build 08' GXP with vacuum assist pump, the brakes do NOT function PROPERLY when needed in an emergency situation. I just want to warn you but not scare you. An example is when you accelerate and then suddenly need to stop(if someone stopped short or pulls out in front of you) when you slam on the brakes, you will feel a push back from the brakes and the pedal will have some resistance not allowing you to stop in the normal amount of space needed. It is very dangerous and should be recalled. The reason this happens is because the vacuum boost has not build up enough to work properly. It's all related to the turbo and the vacuum boost working together at the same time. Stupid design and GM knows it or they would not have a retro kit and would not have went back to the 07' set up.

Several people have had this brake failure happen to them and have rear ended other people. The Saturn Redline 08' that has the same build period has the same problem too. GM needs to make this a recall issue.:brentil:
 

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Probably too late to help now, but a litle research found there are service bulletins on other GM/Pontiac models in this model year range for the same symptoms and fault codes. The brake light and esc issues were due to trace (fretting) corrosion on the pin connectors at the bcm. The fix was specifically not to replace the bcm, but to clean the connections. Sometimes the brake position sensor has to be recalibrated after the repair, which could be the reprogramming you mentioned you found. Modern diagnostic equipment is a marvelous thing if the operator recognizes it can almost never point directly to a problem component....only to a problem circuit. There are always supplementary tests involved to eliminate all other potential causes in the circuit(s) first. But they are manual tests and, well....you know. This explains how you ended up with a new position sensor that did not correct the problem ("the tester said the position sensor is bad"). So unfortunately yes, a new bcm with clean shiny pins will probably fix your problems. But.....
 

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2008GXP,

I am going to reach out to your dealership now I will send you a private message once I hear back.

Erica Tiffany
GM Customer Care
 

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Had the same issue crop up at 31K. Ended up being a hub bolt at the front driver side corner that had come completely out.
 

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Discussion Starter · #16 ·
Mean GXP thanks for the input which makes a lot of sense . My car has low mileage but is five years old so corrosion is the kind of issue that could occur with the car. I will let you all know how it turns out.

Erica I will send you a private message after I see if all this fixed the problem or not. Thank you for contacting me.
 

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Discussion Starter · #17 ·
Red Devil, I understand what your saying on the vacuum assist and the turbo. Thank you.I love this car but may check into the retro fit kit . At least price it. Just backing out of the garage is a bad enough condition. But the potential for the hard pedal when you need assist the most is a serious issue for sure.
 

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Discussion Starter · #19 ·
Its been over a week after the dealer replaced the BCM and flushed the brake fluid. This has fixed the issues I was having. Thanks to all that contributed their input.
 
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