Need help! Have rear speed sensor code, BUT ONLY HAVE 2 WHEEL ABS

ZMXG

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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
 

exp500

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What are the glove compartment codes? And what are the scanner codes showing?
 

swathdiver

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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.
 

Fless

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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.
 
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ZMXG

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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.
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
 
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ZMXG

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What are the glove compartment codes? And what are the scanner codes showing?
What are the glove compartment codes? And what are the scanner codes showing?
C0055 and p0420 showing left rear wheel wheel speed sensor out of range. I don't have rear abs on my tahoe. Think it might have something to do with my TCM
Coot
 

Mudsport96

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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

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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?

2015-01-04_132007_vss.gif
 

Mudsport96

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Any chance any of the control modules or any electronics being replacements from other model or model year?
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

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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.
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.
 

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