New Tires and Now Service Stabilitrack and ABS - SOLVED

[gmartin1215]

Hi

2009 Tahoe with 4" lift without the auto-ride

I recently changed tires and went up from 280/70/17 to 285/75/17, so they are the same width but taller.

After rolling from the tire shop, I got warnings on the dash for the ABS, the stabilitrack off, and a message to service the stabilitrack. I checked the ABS lines inside each wheel well and all looked ok. At this point, I suspect I will need to reprogram the ECU for the different tire size. Thoughts?

If reprogramming does nothing, Can the stabilitrack be disabled somehow so I don't see the annoying messages?

I did get the COO50 code for the right rear speed sensor erratic/malfunctioning, so I will put some focus there. Any tips/suggestions for remedying this would be appreciated.

 

[Dustin Jackson]

Changing tire sizes shouldn't cause this so I would focus on the code you got and look in that area

 

[alpha_omega]

Might need to clean the wheel area and the sensor mounting hole. Add some new dielectric grease and check those connections.

If those don’t help. Check ALL of your grounds. Those and the brake switch are known for throwing codes for the stabilitrack.

 

[gmartin1215]

Might need to clean the wheel area and the sensor mounting hole. Add some new dielectric grease and check those connections.

If those don’t help. Check ALL of your grounds. Those and the brake switch are known for throwing codes for the stabilitrack.

thanks.

I know where the ground is in the engine bay, but where are all the other grounds?

 

[gmartin1215]

Disregard the ground location list question. I found information here

Master Grounds List — 2009 Chevrolet Tahoe 4WD V8-5.3L Service Manual | Operation CHARM

Detailed repair manual for the 2009 Chevrolet Tahoe 4WD V8-5.3L.

charm.li

 

[gmartin1215]

What baffles me is I did not get this stabilitrack error until after I got the new tires on.
I checked the connection for the right wheel sensor and it looks ok, but I did not fully disconnect it (the connection is on top of the frame and a PITA to get to it). Maybe I'll do that next and see if any wires pulled loose.

 

[Doubeleive]

What baffles me is I did not get this stabilitrack error until after I got the new tires on.
I checked the connection for the right wheel sensor and it looks ok, but I did not fully disconnect it (the connection is on top of the frame and a PITA to get to it). Maybe I'll do that next and see if any wires pulled loose.

your abs/stabiltrac is stemming from that COO50 code
so either the sensor has gone bad or a wire got pinched or the harness got disconnected.
they can be difficult to reach but not impossible, there is a service bulletin out there if the shocks are changed the harness connector is right above the top shock bolt so it is easy to get disconnected if you work on the shocks
if it is not the harness connection and the fault remains then a new sensor is only about $25 so I would roll the dice and just buy a new one and then go from there

 

[gmartin1215]

your abs/stabiltrac is stemming from that COO50 code
so either the sensor has gone bad or a wire got pinched or the harness got disconnected.
they can be difficult to reach but not impossible, there is a service bulletin out there if the shocks are changed the harness connector is right above the top shock bolt so it is easy to get disconnected if you work on the shocks
if it is not the harness connection and the fault remains then a new sensor is only about $25 so I would roll the dice and just buy a new one and then go from there

Thanks! This helps.

I am leaning toward getting a new sensor, but want to debug it bit more at the connection. I am suspecting its at the connection where Iam getting the problem so will pull it off the frame and play with it. If not, replace the sensor will be my next step.

 

[Joseph Garcia]

If you have, or have access to, a quality bi-directional scanner, it will bring you to the source of the issue, including the specific wheel where the issue is occurring. Definitely looks to me and others above like a wheel sensor or wheel sensor wiring/connector issue.

 

[gmartin1215]

Got the wires down to check the connection. Took the connection apart, examined it, and replugged back in. Same symptoms. Took the ABS fuse out for a few minutes and turned the truck on. Got the parking light on this time with the ABS and traction control lights. Turned off and then replugged the fuse back in. Still was showing the same errors. I cleared the codes, and there were no lights on. Drove it for about a mile and got the same errors as before. So, I suppose I'll go ahead and try to replace the sensor and see what happens after that step.

 

[Dustin Jackson]

@gmartin1215 I found a thread here and it suggests the issue isn't with the sensor necessarily but with the connector itself. It seems possible that when the new wheels were being installed that the wire could have been damages when the wheel was thrown up to install it. Didn't find any definite resolutions in this thread but something to consider in your troubleshooting.

https://www.silveradosierra.com/threads/c0050-rear-wheel-speed-sensor-circuit-code.610890/

 

[gmartin1215]

@gmartin1215 I found a thread here and it suggests the issue isn't with the sensor necessarily but with the connector itself. It seems possible that when the new wheels were being installed that the wire could have been damages when the wheel was thrown up to install it. Didn't find any definite resolutions in this thread but something to consider in your troubleshooting.

https://www.silveradosierra.com/threads/c0050-rear-wheel-speed-sensor-circuit-code.610890/

Thanks!

 

[gmartin1215]

OK. I rolled the dice and replaced the sensor on the right rear. Cleared codes, drove it around, and back to the same problem with the ABS light on and the service Stabilitrack message, and the same COO50 code. UGH!

I'll ask again...is there any possibility this could be an ECU problem? This problem did not occur until after I got new tires. The new tires are 2" taller than the previous set. Maybe I need to tell the ECU about the different tire size?

If not this, then what are some other ideas to try? I don't have a bi-directional scanner, and nothing fancy/expensive to show what the output may be from these sensors. If it comes to having one of those and spending the big $$$ for one, then I might as well pay someone to troubleshoot it. But, I don't want to give up yet and hope there is something you can suggest.

 

[Doubeleive]

OK. I rolled the dice and replaced the sensor on the right rear. Cleared codes, drove it around, and back to the same problem with the ABS light on and the service Stabilitrack message, and the same COO50 code. UGH!

I'll ask again...is there any possibility this could be an ECU problem? This problem did not occur until after I got new tires. The new tires are 2" taller than the previous set. Maybe I need to tell the ECU about the different tire size?

If not this, then what are some other ideas to try? I don't have a bi-directional scanner, and nothing fancy/expensive to show what the output may be from these sensors. If it comes to having one of those and spending the big $$$ for one, then I might as well pay someone to troubleshoot it. But, I don't want to give up yet and hope there is something you can suggest.

unfortunately you are chasing ghost's without a scanner and or/live data
has nothing to do with tire size, unless you have different size tires up front. the computer doesn't care if you are running 17"s or 35"s or any other size.
I pinched the wire on mine once, but that was a easy visible fix.
you could look for a open circuit/shorted circuit with a standard electrical meter, but that's the best it's going to get without a scanner
another possibility is if the sensor inside the axle got messed up somehow, there is a ring inside the axle housing that the abs sensor reads, if they pulled the axles for some reason it could have got messed up. \
the bottom line is you need to see the live data for real troubleshooting.

 

[mikez71]

And we demand pictures!

 

[Fless]

Go to the link below and verify that this is your vehicle, then expand the Testing and Inspection link, and the "C Code Charts" link, and scroll down and expand the C0050 code. There you'll find diagnostic aids for the specific code. Note that some codes have suffixes that can help narrow down the issue, if your scanner can show them.

A L L Diagnostic Trouble Codes ( DTC ) — 2009 Chevrolet Tahoe 4WD V8-5.3L Service Manual | Operation CHARM

Detailed repair manual for the 2009 Chevrolet Tahoe 4WD V8-5.3L.

charm.li

 

[PG01]

If it really happened right after you left the tire place, I would drive right back there and tell them to fix it…. It was fine when you brought it in but all of a sudden…. Highly doubtful it’s coincidence but ya know…..it could be

 

[Dustin Jackson]

No problem with your ECU or tire size. Next thing to look at would be the live data coming from that sensor which most basic OBD2 readers should be able to tell you if they support live data.

What I expect for you to see is that sensor is reading intermittently or not reading at all. The code you have is for an open circuit, meaning the electrical for that sensor is severed or disconnected somewhere resulting in ZERO reading, the code doesn’t mean the reading is off it means there is no reading at all.

 

[dkad260]

Here's a few thoughts that are not likely but something I would check to be sure and remove possibilities.



I would take the RR tire and either swap it with the LR or maybe the RF...but would try swapping both sides of the rear axle and see if the code moves to the LR.

Verify the tread depth on all 4 tires.

I assume you verified all the tires are the same size, also check the date code, maybe one is older and has different specs. Check the load range and speed rating, verify all are the same because there could be a tread depth variation on different spec tires.

With the rear tires in the air, tape a piece of string to the center of the tread, bring it around and mark the point where it meets the other end of the string, repeat on LR. It's a long shot but verify the circumference.

Did the shop by chance damage a wheel stud? Check for any new studs, another wild thought would be hammering the stud would move the ABS tone ring slightly on the axle shaft. You could remove the ABS sensor and look inside and see if just the edge of the tone ring is inline with the sensor pickup, or if it has plenty of surface area visible.

Were changing tires the ONLY thing the shop did? No axle seal, bearing..etc? No reason to pull an axle?

Just a few ideas to maybe help.

 

[dkad260]

Sounds like the PCM is seeing a discrepancy in wheel RPM and throwing the code. This would possibly point to one tire being a different circumference.