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Discussion Starter #1
I don't usually believe in coincidence, but I want to run it by this forum to see if I am missing some relation.

2 weeks ago we couldnt do inspection because of check engine light. The car was also having a hard time starting up after filling up gas. Help on this forum led me to a simple replacement of the Purge Valve Solenoid. I cleared the light and drove for a few days, then got the car inspected and passed. Then a few days after that, the Service Stabilitrak, Traction Control Off message started appearing and weird feeling when braking or turning.

Is there any relation between the purge valve and the stabilitrak problem? Or is this truly just coincidence of timing?
 

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I think coincidence.

THere are many issues that can cause that message to appear.
Check for pending CELs. or set CELs.
 

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Discussion Starter #3
Good to know. I don't want one fix to be the cause of more problems.

I pulled the P0011 initially and performed the cleaning I saw in another post with soap and water on the bearing housing (topic=2209) but the problem reoccurred.

Now it is showing P0011 and C0561.

It is at the dealership today for them to do a diagnosis.
 

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that C0561...

do you have anything plugged into the OBD port?
 

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Discussion Starter #5
Interesting question. I did have a bluetooth ODB-II scanner plugged in, but it was AutoZone that pulled that C code with their own wired scanner.
 

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Having stuff plugged into the OBD port- can generate that Code.
 

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from the service manual (as posted by another member)

C0561 - "System Disabled Information Stored" - EBCM receives an invalid serial data message from another module (BCM, ECM, IPC, or TCM)






Multiple Conditions Caused by Aftermarket Devices Plugged into the Data Link Connector
February 11, 2013

For everything from saving on automobile insurance to connecting aftermarket cruise control, there are now a number of devices that owners plug into the Data Link Connector (DLC), or Assembly Line Diagnostic Link (ALDL). However, any unauthorized device connected to the DLC may cause a variety of hard-to-diagnose conditions.



Many of the problems caused by devices connected to the DLC are communication issues on the High Speed Controller Area Network (HSCAN) bus. An additional issue with diagnosing these conditions is that many times the device itself may be removed by customers when their vehicle is brought in for service.



Many possible problems are caused by an open connection on the HSCAN bus. For example, if the device only makes connection with one CAN +, it will cause bus errors and strange control module behavior.



Known Symptoms



The various issues described by customers with their vehicles are often related to high- or low-speed data bus traffic. The conditions can be extremely varied, but some known issues are:



• Radio will not turn off after turning off the vehicle

• Bus or LAN traffic stays active, leading to a discharged battery

• Problems reprogramming control modules either because of interference or the device will not allow the bus to power down

• Interference with OnStar’s ability to provide diagnostic data

• Engine and transmission performance issues with the Check Engine light on

• Intermittent stalling

• Reduced power DIC messages and DTCs

• StabiliTrak DIC messages and DTCs

• DTC C0561 (System Disabled Information Stored Invalid Data) in the Electronic Brake Control Module (EBCM) leading to a traction control issue

• No High Speed LAN communication along with various DTC communication U-codes

• Transmission will not shift for one key cycle (TCM in default mode)

• Instrument cluster gauges erratic or flickering

• Service Engine Soon or Check Engine MIL illuminated and numerous DTC communication codes such as U0100 (Lost Communication With Engine Control Module), U0101 (Lost Communication With Transmission Control Module), U186B (Electronic Brake Control Module Lost Communication with Transmission Control Module) and U1862.

• Diesel power-up devices resulting in no power in 4WD Low range

• Service Tire Pressure Monitor System MIL illuminated; cannot relearn the Tire Pressure Monitor System

• Hybrid issues regarding reduced propulsion power DIC messages and service high voltage charging system DIC messages



Diagnosis



TIP: The Diagnostic System Check – Vehicle (the starting point for any diagnostic procedure) in the Service Information calls out that there should not be any aftermarket devices connected or installed that affect the operation of the system. Additional information under Checking Aftermarket Accessories explains how to check for aftermarket accessories. The Diagnostic System Check Instructions link at the top of the Diagnostic System Check – Vehicle procedure also provides further information about aftermarket accessories and their possible negative effect on the vehicle.



During diagnosis, if nothing else can be identified as the root cause of the condition, check for a device plugged into the DLC.



If a device is available, attempt to duplicate the condition. Remove the device to determine if the condition is eliminated. If confirmed, inform the customer of the issue and that it will be necessary to work with the supplier of the device for further resolution. If the condition is not eliminated, continue with the diagnostics in the appropriate Service Information.



If any parts appear to have been damaged by the device or the installation of the device, document on the repair order what was identified on the vehicle. This would not be covered under the New Vehicle Limited Warranty.



Possible Devices



Connected devices may be used for such things as tracking and/or maintenance interval scheduling (more common on fleet and rental vehicles) (Fig 3), insurance monitoring that automatically keeps track of the vehicle’s driving record (Fig. 4), aftermarket cruise control (Fig. 5), police speed checking (RADAR or LIDAR) and other aftermarket components.






OnStar



Certain aftermarket devices connected to the DLC may interfere with OnStar’s ability to perform a diagnostic probe when requested (via a blue button call) by a subscriber. These devices also prohibit the ability to gather diagnostic and tire pressure data for a subscriber’s scheduled OnStar Vehicle Diagnostic (OVD) e-mail.



These aftermarket devices use the vehicle’s serial data bus to perform data requests and/or information gathering. When these devices are requesting data, OnStar is designed not to interfere with any data request being made by these devices as required by OBD II regulations.



When performing a diagnostic check for an unsuccessful or incomplete OnStar diagnostic probe, or for concerns regarding completeness of the OVD e-mail, verify that an aftermarket device was not present at the time of the requested probe.



If an aftermarket device is interfering (including a scan tool of any type), the OVD e-mail will consistently display a “yellow” indication in the diagnostics section for all vehicle systems except the OnStar System, and the tire pressure data (not available on all vehicles) will not be displayed (i.e. the section is collapsed).



Refer to Bulletin #08-08-46-004A for additional information on OnStar Diagnostic Services.
 

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Discussion Starter #8
Oh wow, so this whole thing can be just a false alarm self inflicted by the scanner I left plugged in when I was debugging the purge valve issue? And simply removing it could resolve this? That would be fantastic, thank you.
 

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please keep us updated.
 

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Discussion Starter #10
Well, it looks like I wont have the chance to give a simple update on pulling out the bluetooth ODB-II, but that is a plus for me.

The car is still at the dealership and they are being super nice fixing things under warranty to nail down the problem. It probably isn't a simple removal of the adapter because by now they must have removed it to put in their own diagnostic tools and they are still seeing the problems. I'm just thankful that they are taking care of it as a warranty issue.
 

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Discussion Starter #11
jmboulos said:
Well, it looks like I wont have the chance to give a simple update on pulling out the bluetooth ODB-II, but that is a plus for me.

The car is still at the dealership and they are being super nice fixing things under warranty to nail down the problem. It probably isn't a simple removal of the adapter because by now they must have removed it to put in their own diagnostic tools and they are still seeing the problems. I'm just thankful that they are taking care of it as a warranty issue.
Well, so much for a positive dealership experience. They kept my car for 2 weeks and we thought they were doing all sorts of repairs on it. They even gave us a brand new Tahoe as a loaner, so I thought they'd be motivated to fix and return our car. After checking in several times, it turns out they did nothing except a side-impact airbag recall. Then they wanted to charge us for the timing chain replacement. We said no because we read on the forum several others who had dealers change this and it didnt solve the problem.

SO now I have the car back and I took out the ODB-II adapter (which the dealer left in). The check engine light went off by itself after a few hours to 1 day. Then on day 2 the Stabilitrak message came back, but the CEL is still clear. I imagine it will turn on again soon.
 
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