As the title says my 01 tahoe only has 2 wheel abs and my lights on for a driver rear wheel speed sensor. I'm a technician by trade and have never ran into this before. Anyone ever had this issue or know what could be causing it? Thank you
Need help! Have rear speed sensor code, BUT ONLY HAVE 2 WHEEL ABS
- Thread starter ZMXG
- Start date
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swathdiver
Full Access Member
Never heard of 2 wheel ABS. ABS works with all four wheels, there are ABS rings and sensors in the rear axle. The codes are specific to affected side, the connector probably just fell out and needs to be pushed back in.
Some original ABS systems were on the rear wheels only (my '94 Exploder, for example), but I don't know if GM ever did that, or when it changed to all 4 wheels.
No sensors or pigtails for the rear wheels on mine. Dodge does a 2 wheel abs on the early 2000 rams. I'm figuring it has something to do with the TCM as strange as that sounds
Coot
Mudsport96
Full Access Member
Not sure when exactly the tahoe platform changed to the 4 wheel system of abs with sensors on the axle. But the earlier systems used the speed sensor for the speedometer as the rear abs sensor also. So if the op doesn't have the sensors at the axle, he should check his vss. Pretty sure the Silverados used this style system up to the 07 or 08 body style change.
MassHoe04
Full Access Member
That IS weird!
My 04 has 3 sensors. LF, RF (one on each hub) and uses the Vehicle Speed Sensor (VSS) for the rear.
The VSS is at the back side of the transfer case at about 11 O'clock position (#7 on the image below).
Not sure how 01 would be different than others in 00-06 production.
But... If yours actually has separate left and right ABS sensors on the rear wheels only, then I would think the sensors would be in the outboard positions near the ends of the rear axle shafts.
Any chance any of the control modules or any electronics being replacements from other model or model year?
My 04 has 3 sensors. LF, RF (one on each hub) and uses the Vehicle Speed Sensor (VSS) for the rear.
The VSS is at the back side of the transfer case at about 11 O'clock position (#7 on the image below).
Not sure how 01 would be different than others in 00-06 production.
But... If yours actually has separate left and right ABS sensors on the rear wheels only, then I would think the sensors would be in the outboard positions near the ends of the rear axle shafts.
Any chance any of the control modules or any electronics being replacements from other model or model year?
Mudsport96
Full Access Member
If you are asking if the the 4 channel system can be swapped into a 3 channel vehicle...i suppose anything is possible. But, it probably would require a majority of a donor vehicle to get all the sensors and modules that are probably needed. Then a tune to go with them, as i believe there was a thread a few months ago about someone using a esky tune in a tahoe and having traction control issues.
MassHoe04
Full Access Member
I was asking the OP if any of the critical computer/control modules replaced from a different donor vehicle and transplanted into his. I thought maybe it was looking for a 4th sensor that wasn't there any more.
Mudsport96
Full Access Member
Well, guess i completely missed the mark on that one... lol.
But, that is a good question. I think really the only things that might affect that would be the pcm and MAYBE the bcm.
Pcm connectors are all the same for p01s and p59s respectively, but for body control modules i do not know if they all have the same plugs or not... one would THINK/ASSUME that the 4 channel would have more sets of wires. This needing more plugs on the module. But i honestly don't know.
There are several service bulletins on this area. It is the sleep on TCCM usually. Reset/reprogam/ replace. If it happens at key on thats pretty definate. Water intrusion is another cause.
Remove the underhood (ATCM or TREC) TCCM fuse.
Wait 30 seconds.
Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
If it still has the code (CURRENT, not in HISTORY) then lt needs reprogram /replace.
Remove the underhood (ATCM or TREC) TCCM fuse.
Wait 30 seconds.
Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
If it still has the code (CURRENT, not in HISTORY) then lt needs reprogram /replace.
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