Erratic shifting c0055

Mooseman

Moderator
Dec 4, 2011
25,257
Ottawa, ON
Code C0055 stands for Rear Wheel Speed Sensor Circuit. Either the sensor or it's wiring is having an issue.
 

christo829

Member
Dec 7, 2011
497
Fairfax, Virginia
Depends on whether the problem is a faulty sensor or damaged wiring. Do you have a scan tool or app that can see real time data? If so, do you see a signal from the rear speed sensor? If so, the problem is most likely the signal itself, which would tend to indicate replacing the sensor. If *not*, check the wiring harness for any apparent damage, check the fuse, check for circuit continuity. If you find a problem in the wiring, fix it and see if it clears up your problem.

Good Luck!

(EDIT: Obviously I'm typing too slowly this weekend!)

Chris
 

Mr.cant.get.right

Original poster
Member
Aug 16, 2020
5
Phoenix, az
Thx for the reply moose. Now, would I have to check the wiring through out the entire harness if the truck? Do you have any clue of what area I should start or pay closest attention too?
 

freddyboy61

Member
Dec 4, 2011
276
#2 would be for the rear wheel speed
 

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TJBaker57

Member
Aug 16, 2015
2,897
Colorado
How often does the vss Go bad on 05 trailblazers? Is it a common issue?

More often wiring issues cause trouble, right down under the truck by the transfer case. For one of the other speed sensors down there (there are 3) there was a TSB describing how water would get into the wiring and foul up the signal. It requires a twisted pair of wires, twisted at a rate of 9 twists per foot if you have to repair any of it.
 

Mooseman

Moderator
Dec 4, 2011
25,257
Ottawa, ON
Another possibility, if you have done anything with these sensors, is the front and rear sensor connectors were swapped accidentally. Seen it happen a couple of times when the transfer case has been replaced.
 

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