GM MDI 2 how to reprogram ABS?
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
GM MDI 2 how to reprogram ABS?
Does anyone know how to use the genuine GM tools / subscription service to reset / reprogram the ABS? I'm aware of the "so called" other procedures, hold down the brake pedal, etc... nothing for me works. And as I have all the corret authentic GM tools / subscription service, I'd like to perform the correct dealer steps, but cannot find it anywhere on how to do it?
Thank you...
Thank you...
Drifting
Joined: Feb 2023
Posts: 1,357
Likes: 1,119
Does anyone know how to use the genuine GM tools / subscription service to reset / reprogram the ABS? I'm aware of the "so called" other procedures, hold down the brake pedal, etc... nothing for me works. And as I have all the corret authentic GM tools / subscription service, I'd like to perform the correct dealer steps, but cannot find it anywhere on how to do it?
Thank you...
Thank you...
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
It is not clear to me what you are trying to do. Do you have an ABS or brake malfunction? Is your ABS light on? Do you have any DTC related to the ABS? There are multiple modules involved in the ABS operation. Are any of them displaying DTCs? When you say reprogram, are you trying to reprogram a particular module?
Drifting
Joined: Feb 2023
Posts: 1,357
Likes: 1,119
Well my question was if anyone knew how to re-program the ABS via the authentic GM method, not "hacks" that have been posted... But yes, I have DTC's related to a speed sensor, but can clear them and they resolve themselves for a track day, but come back the next track day, and I believe because of my change in tire size on the track I get vibrations which I believe are ABS kicking in. If I run PTM Sport mode it's horrible how often the ABS kicks in. Running Race 2, it's a bit less, but still there. Especially during cornering, braking, etc... I have tested with new rotors, new brake pads and it doesn't happen only when braking, but anytime. I've replaced my wheel hubs thinking those could be it, so the last thing I could think of is that the ABS needs reprogramming via the genuine GM tools / software.
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
Yeah, so you need to change the calibrated tire sizes first to see if this resolves your issues. Since no one can access the ECM calibration, I don't know if even a dealership can change this because reprogramming any modules works off your VIN. I am guessing you do not have speed sensor codes indicating a component malfunction such as signal drop out or exciter ring missing teeth.
Rear: 19x11.5” ET48, a recommended size according to Apex and many others. Had vibration with Goodyear Eagle tires at VIR and now using Toyo R888R, still vibration at Road America this weekend.
Race Director
Joined: Mar 2007
Posts: 11,360
Likes: 8,512
In the version of the manual I have, C0501 is described as "Left Front Wheel Speed Sensor Circuit Performance". Reading further, for this specific code, it says "Signal Performance" (to be distinguished from other conditions short to ground, short to voltage, or open circuit). And reading further, for this specific code it says: "Erratic Wheel Speed Sensor
C0501, C0507, C050D, C0513
Debris on the component.
Incorrect installation of a component
Incorrect wheel speed sensor air gap
Electromagnetic Interference
The reluctor ring has missing teeth, magnetic segments, or indentations for a reference gap."
So, while you may have other issues related to inconsistent speed measurement caused by non-OEM tire sizes, this code would appear to indicate an actual malfunction with the sensor. I suppose its possible that the non-OEM tire sizes could cause this, but if that's the case, why is it only limited to one wheel?
There is a code that is set when there is a discrepancy between the Vehicle Speed Sensor and Wheel Speed Sensors - "P215A - Vehicle Speed Sensor and Wheel Speed Sensor Correlation". And "An incorrect wheel and tire size or mounting issue may also cause DTC P215A to set."
Have you seen this code?
C0501, C0507, C050D, C0513
Debris on the component.
Incorrect installation of a component
Incorrect wheel speed sensor air gap
Electromagnetic Interference
The reluctor ring has missing teeth, magnetic segments, or indentations for a reference gap."
So, while you may have other issues related to inconsistent speed measurement caused by non-OEM tire sizes, this code would appear to indicate an actual malfunction with the sensor. I suppose its possible that the non-OEM tire sizes could cause this, but if that's the case, why is it only limited to one wheel?
There is a code that is set when there is a discrepancy between the Vehicle Speed Sensor and Wheel Speed Sensors - "P215A - Vehicle Speed Sensor and Wheel Speed Sensor Correlation". And "An incorrect wheel and tire size or mounting issue may also cause DTC P215A to set."
Have you seen this code?
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
In the version of the manual I have, C0501 is described as "Left Front Wheel Speed Sensor Circuit Performance". Reading further, for this specific code, it says "Signal Performance" (to be distinguished from other conditions short to ground, short to voltage, or open circuit). And reading further, for this specific code it says: "Erratic Wheel Speed Sensor
C0501, C0507, C050D, C0513
Debris on the component.
Incorrect installation of a component
Incorrect wheel speed sensor air gap
Electromagnetic Interference
The reluctor ring has missing teeth, magnetic segments, or indentations for a reference gap."
So, while you may have other issues related to inconsistent speed measurement caused by non-OEM tire sizes, this code would appear to indicate an actual malfunction with the sensor. I suppose its possible that the non-OEM tire sizes could cause this, but if that's the case, why is it only limited to one wheel?
There is a code that is set when there is a discrepancy between the Vehicle Speed Sensor and Wheel Speed Sensors - "P215A - Vehicle Speed Sensor and Wheel Speed Sensor Correlation".
Have you seen this code?
C0501, C0507, C050D, C0513
Debris on the component.
Incorrect installation of a component
Incorrect wheel speed sensor air gap
Electromagnetic Interference
The reluctor ring has missing teeth, magnetic segments, or indentations for a reference gap."
So, while you may have other issues related to inconsistent speed measurement caused by non-OEM tire sizes, this code would appear to indicate an actual malfunction with the sensor. I suppose its possible that the non-OEM tire sizes could cause this, but if that's the case, why is it only limited to one wheel?
There is a code that is set when there is a discrepancy between the Vehicle Speed Sensor and Wheel Speed Sensors - "P215A - Vehicle Speed Sensor and Wheel Speed Sensor Correlation".
Have you seen this code?
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Melting Slicks
Joined: Feb 2000
Posts: 3,424
Likes: 567
From: new orleans
The system works in one of two ways: you must have all four TPMS sensors installed, or none. I have none installed, and everything as far as PTM works, obviously not the TPMS signal. I know what a flat tire feels like on the track, so I opt for a steel valve stem. I dont want a TPMS sensor to take a crap and ruin a track day. I use a manual tire pressure gauge and a pyrometer to track tire temps and pressures. I find the TPMS isn't that accurate when I want to get to 1/2 pound pressures, and also starting at real low tire pressures.
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
The system works in one of two ways: you must have all four TPMS sensors installed, or none. I have none installed, and everything as far as PTM works, obviously not the TPMS signal. I know what a flat tire feels like on the track, so I opt for a steel valve stem. I dont want a TPMS sensor to take a crap and ruin a track day. I use a manual tire pressure gauge and a pyrometer to track tire temps and pressures. I find the TPMS isn't that accurate when I want to get to 1/2 pound pressures, and also starting at real low tire pressures.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
@Scott_Wisconsin you're closer to stock diameters than I am and I have no issues on track.
I think, as Andy pointed out, the issue is your individual speed sensor.
Also, have you looked at the PDR data with the Cosworth Pi program? I ask because you can see when the TC / ESC is being activated. Looking at this data could be useful to know what is happening that you are feeling in the car.
I think, as Andy pointed out, the issue is your individual speed sensor.
Also, have you looked at the PDR data with the Cosworth Pi program? I ask because you can see when the TC / ESC is being activated. Looking at this data could be useful to know what is happening that you are feeling in the car.
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
@Scott_Wisconsin you're closer to stock diameters than I am and I have no issues on track.
I think, as Andy pointed out, the issue is your individual speed sensor.
Also, have you looked at the PDR data with the Cosworth Pi program? I ask because you can see when the TC / ESC is being activated. Looking at this data could be useful to know what is happening that you are feeling in the car.
I think, as Andy pointed out, the issue is your individual speed sensor.
Also, have you looked at the PDR data with the Cosworth Pi program? I ask because you can see when the TC / ESC is being activated. Looking at this data could be useful to know what is happening that you are feeling in the car.
I was running in Race 2 mode, so there is no TC / ESC to kick in. All that is left is ABS, which according to Cosworth Pi, it never kicked in either, so I'm stumped.
I will be changing all rotors and pads to brand new, get my tires re-balanced, free of tire marbles, and see if the problem happens again at Watkins Glen at the end of this month..
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
I had looked at the Cosworth Pi software, and nothing seems out of the ordinary. All speed sensors are within 1.6 kph, which is GM spec, everything looks fine. Got it back from the dealership, they stated there was some excessive grease on the speed sensor that caused the C0501 DTC, but even according to Cosworth Pi the speed sensor was always working. What was funny is I'd get the C0501 code, "Service ESC" message on the dash. I could power cycle the car, not even have to clear the code, then the next drive the "Service ESC" would automatically go away. But this happened every time the car sat for more than 6 hours, or overnight. But once cleared, if I kept tracking the car through the day, I never got the "Service ESC", untilt he next track day when the car sat overnight.
I was running in Race 2 mode, so there is no TC / ESC to kick in. All that is left is ABS, which according to Cosworth Pi, it never kicked in either, so I'm stumped.
I will be changing all rotors and pads to brand new, get my tires re-balanced, free of tire marbles, and see if the problem happens again at Watkins Glen at the end of this month..
I was running in Race 2 mode, so there is no TC / ESC to kick in. All that is left is ABS, which according to Cosworth Pi, it never kicked in either, so I'm stumped.
I will be changing all rotors and pads to brand new, get my tires re-balanced, free of tire marbles, and see if the problem happens again at Watkins Glen at the end of this month..
Up to you how you want to attack this... just get it working, or understand the issue at hand. I'd run it without the new rotors, pads, and Wheel balancing (and not to mention that expense... but perhaps that's a non-issue). Take the dealership's account of it being grease and run it knowing you can clear the code and continue (I didn't see any indication of issues while on track as a result).
Do you want to share the screen captures of what you see in the Pi software or share the workbook possibly? I'm by no means an expert with Pi, but I'm happy to take a look if nothing more than for my own curiosity.
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
That is puzzling for sure then.
Up to you how you want to attack this... just get it working, or understand the issue at hand. I'd run it without the new rotors, pads, and Wheel balancing (and not to mention that expense... but perhaps that's a non-issue). Take the dealership's account of it being grease and run it knowing you can clear the code and continue (I didn't see any indication of issues while on track as a result).
Do you want to share the screen captures of what you see in the Pi software or share the workbook possibly? I'm by no means an expert with Pi, but I'm happy to take a look if nothing more than for my own curiosity.
Up to you how you want to attack this... just get it working, or understand the issue at hand. I'd run it without the new rotors, pads, and Wheel balancing (and not to mention that expense... but perhaps that's a non-issue). Take the dealership's account of it being grease and run it knowing you can clear the code and continue (I didn't see any indication of issues while on track as a result).
Do you want to share the screen captures of what you see in the Pi software or share the workbook possibly? I'm by no means an expert with Pi, but I'm happy to take a look if nothing more than for my own curiosity.
Racer
Joined: Apr 2024
Posts: 353
Likes: 180
From: Michigan
How ever you want to do it... I obviously have the Pi software, so honestly I just need a copy of the unmodified MP4 file. I'll send you a PM with my email and If you can share it via a cloud storage or something I can pull it down and toss it into my workbook template to take a look. That might be easier... but whatever works for you is fine.
Thread Starter
Burning Brakes
Joined: Jun 2014
Posts: 1,042
Likes: 125
How ever you want to do it... I obviously have the Pi software, so honestly I just need a copy of the unmodified MP4 file. I'll send you a PM with my email and If you can share it via a cloud storage or something I can pull it down and toss it into my workbook template to take a look. That might be easier... but whatever works for you is fine.
