*HELP* 416 LS9 2010 Camaro SS *Service Stabilitrack Issues*

[NOT A 45]

Originally Posted by Brandonlin152

Thank you, I will test this during the week! Can I buy a used ebcm on ebay or not a good idea?

I’m a dealership guy....don’t believe in any used electrical part but in this instance and knowing how expensive those are why not try? As long as it’s the same part # and you have it programmed go for it. Hell its very likely the part has been discontinued or back ordered anyhow. I’ve waited over 6 months for a bcm for a 10 vette recently!

[NOT A 45]

There is a place in Pennsylvania that reconditions them but I can’t recall who they are. I’ve used their stuff in the past and had no problems

[NOT A 45]

Originally Posted by acutron42

I found on alldata that there is a tsb on some of these symptoms. It is all greek to me but I figure why not post it & maybe it will help or may not even be related as I see you have a 2010.

This bulletin applies to all Chevrolet vehicles model years 2013-2018. When diagnosing multiple DTCs, one may be U****Byte 71. Any control module may set a DTC for one of its inputs and that data is shared across the communication bus for other modules to perform their respective functions.

The receiving module may set a 71 byte type DTC. A symptom byte 71 indicates invalid data. This sub type is used by the ECU to indicate a signal was received but invalid.

In these cases, the DTC list should be examined for what control module or missing data the U codes point to and check for DTCs related to the managing control module’s inputs. As a general rule, never replace components for “Invalid Data Received” codes within the component. Resolve the system-wide non-communication (not U codes) first.

An example is an intermittent wheel speed sensor code is setting U codes across buses and the root cause was tracked back to the wheel speed sensor and EBCM messages. When the EBCM sets any of the wheel sensor codes C0035-C0050, it yields “Service Transmission,” “Steering Assist Reduced” and “AWD off” in addition to “Service Stabilitrak” and “Service ABS” messages. This is in addition to several U codes corresponding to these messages which may include U0121, U0131, B1011, U0414, C0040, U0422, U0415, U2502, U0401, U0403 and U0402.

The EBCM would set the wheel speed sensor code intermittently, triggering a system malfunction message to be transmitted, resulting in multiple U codes across a chassis expansion and HS CAN buses.

The multiple U codes can cause misdiagnosis. An erratic wheel speed signal can cause this failure due to miscommunication in the system when it intermittently fails. When you review ABS data you may find an erratic signal from the wheel speed sensor. This can be caused by a faulty front hub wheel bearing.

I do this for a living, please read my response to his problem. I’m aware of this bulletin and it’s not what he has going on. Read the data from the scan tool! Symptom bytes are the last 2 digits after the code.....do you see a 71?

[acutron42]

Thanks for pointing that out, I deleted that post. Just trying to learn this stuff lol. Your explanation helped me learn!

[Brandonlin152]

Originally Posted by NOT A 45

I’m a dealership guy....don’t believe in any used electrical part but in this instance and knowing how expensive those are why not try? As long as it’s the same part # and you have it programmed go for it. Hell its very likely the part has been discontinued or back ordered anyhow. I’ve waited over 6 months for a bcm for a 10 vette recently!

I will just try to switch the ebcm over first then as I understand it, if that doesn't fix it and I need the other part, I will need to have that programed? thanks!

[silversleeper]

Originally Posted by acutron42

Thanks for pointing that out, I deleted that post. Just trying to learn this stuff lol. Your explanation helped me learn!

I wouldn't delete that info (it's good it's in his reply). It might help someone else who has the 71 code and simply a sensor bad not replacing expensive modules. It sounds like the gm tech is correct in this particular car but a broader understanding of some problems is good too. It's helpful he replied why it's not the case here too.

[NOT A 45]

Originally Posted by silversleeper

I wouldn't delete that info (it's good it's in his reply). It might help someone else who has the 71 code and simply a sensor bad not replacing expensive modules. It sounds like the gm tech is correct in this particular car but a broader understanding of some problems is good too. It's helpful he replied why it's not the case here too.

Ok, I don't profess nor do I carry myself as a "know it all" Far from it, I've been in this profession for 38 years, and I've learned a lot more from what not to do than what to do. I've learned over the years that in order to quickly diagnose a drivability problem, the key is to understand what the scan tool is trying to tell you. I'm sure that most people reading this have been to a parts retailer that offers to scan your car in the lot. They will tell you that you have such and such a code, and you need this sensor or that. Probably most of the time it corrects the problem....but not always. A quality or more advanced scanner will not only show you live data, but it will show you the code stored as well as a symptom byte code. In the instance of this guys problem, he showed a bunch of history codes but only one of the codes was requesting the lights to come on. In my experience, that's the first code to attack. The other codes set are most likely phantom codes set resulting from the real problem that we know for sure...C0110. So this code showed a symptom byte of 00. That byte means the problem is a power/short or ground issue. Service bulletins are a great resource for information and often lead you to a known issue. The bulletin the gentleman suggested here deals with multiple codes that this guy has, but the symptom byte is a 71. 71 means that there is invalid or non-plausable data coming from the module. That's completely different from what we have here, so this particular bulletin does not apply.

I have seen this exact issue not just on Camaro but several other models we sell. Trust me electrical problems challenge even us in the business, and are almost impossible for the diy guys. I hope I've helped this fella, I try not to give bad advice.

Just want to elaborate on what I said earlier

[acutron42]

Very well said! Your explanation makes it much easier to understand. Thanks for the learning experience & hope the op gets this figured out.

[1JEWLDSSRS]

Originally Posted by NOT A 45

Ok, I don't profess nor do I carry myself as a "know it all" Far from it, I've been in this profession for 38 years, and I've learned a lot more from what not to do than what to do. I've learned over the years that in order to quickly diagnose a drivability problem, the key is to understand what the scan tool is trying to tell you. I'm sure that most people reading this have been to a parts retailer that offers to scan your car in the lot. They will tell you that you have such and such a code, and you need this sensor or that. Probably most of the time it corrects the problem....but not always. A quality or more advanced scanner will not only show you live data, but it will show you the code stored as well as a symptom byte code. In the instance of this guys problem, he showed a bunch of history codes but only one of the codes was requesting the lights to come on. In my experience, that's the first code to attack. The other codes set are most likely phantom codes set resulting from the real problem that we know for sure...C0110. So this code showed a symptom byte of 00. That byte means the problem is a power/short or ground issue. Service bulletins are a great resource for information and often lead you to a known issue. The bulletin the gentleman suggested here deals with multiple codes that this guy has, but the symptom byte is a 71. 71 means that there is invalid or non-plausable data coming from the module. That's completely different from what we have here, so this particular bulletin does not apply.

I have seen this exact issue not just on Camaro but several other models we sell. Trust me electrical problems challenge even us in the business, and are almost impossible for the diy guys. I hope I've helped this fella, I try not to give bad advice.

Just want to elaborate on what I said earlier

Well I have to say 45, reading through ALL the information you post on this forum in different sections for the folks that are having issues with their cars, it is truly a blessing to have someone as knowledgeable and well versed in the "goings on" of our Camaro's as you are, and being IN the business of diagnosing and repairing these beautiful cars, is a Godsend!! Thanks for being on here for us all!! Keep up the amazing work sir!!

[NOT A 45]

Originally Posted by 1JEWLDSSRS

Well I have to say 45, reading through ALL the information you post on this forum in different sections for the folks that are having issues with their cars, it is truly a blessing to have someone as knowledgeable and well versed in the "goings on" of our Camaro's as you are, and being IN the business of diagnosing and repairing these beautiful cars, is a Godsend!! Thanks for being on here for us all!! Keep up the amazing work sir!!

Thank you, I'm certainly not perfect but I do enjoy helping like minded people who share the same passion that my wife and I do. Anyone who has a issue is welcome to contact me and if I can't answer the question I'll use my resources and do my best to find the answer.

[1JEWLDSSRS]

Originally Posted by NOT A 45

Thank you, I'm certainly not perfect but I do enjoy helping like minded people who share the same passion that my wife and I do. Anyone who has a issue is welcome to contact me and if I can't answer the question I'll use my resources and do my best to find the answer.

You are oh so welcome sir, and much appreciated!! And your wife?? Niiicceee...

[Brandonlin152]

First of all I would like to thank everyone for quick responses and most importantly NOT A 45 for his expertise!

I ordered a used ebcm for $30 on ebay. Upon removing my ebcm I noticed the bottom corner that was not visible is cracked. I believe the owner before me that originally did the swap must have busted the module when pulling motor. I installed the used module without programming and all is fixed!

[NOT A 45]

Originally Posted by Brandonlin152

First of all I would like to thank everyone for quick responses and most importantly NOT A 45 for his expertise!

I ordered a used ebcm for $30 on ebay. Upon removing my ebcm I noticed the bottom corner that was not visible is cracked. I believe the owner before me that originally did the swap must have busted the module when pulling motor. I installed the used module without programming and all is fixed!

AWESOME! Man it really makes me feel good when I can help someone!

[silversleeper]

As much as the advice that turn out correct was important, it was good you updated the thread so people could know what symptoms and conditions and repairs might apply to them. As they search for a fix someday.