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2012 Silverado 4wd c0050
- Thatboiiharris
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4 years 3 months ago #36704
by Tyler
Replied by Tyler on topic 2012 Silverado 4wd c0050
You very likely have an open circuit or high resistance in the RR WSS circuit. Have a close look at the first six inches of harness at the RR WSS connector. Chances are very good you'll find green crusties. 
I've seen this problem happen about a dozen times now on that body style of Silverado.
So why no 12V feed to the sensor? It's part of the EBCM strategy when it detects a circuit fault. As soon as you turn the key on, the EBCM tests all the WSS circuits. Any circuit fault detected results in the EBCM disabling the 12V feed for that sensor. Deceptive, isn't it?
Definitely a case of intentional shutdown.
This PI from GM has more information about this strategy, and how to catch it taking place:
www.scannerdanner.com/media/kunena/attac...7/wssdiagnostics.pdf
I've seen this problem happen about a dozen times now on that body style of Silverado.So why no 12V feed to the sensor? It's part of the EBCM strategy when it detects a circuit fault. As soon as you turn the key on, the EBCM tests all the WSS circuits. Any circuit fault detected results in the EBCM disabling the 12V feed for that sensor. Deceptive, isn't it?
Definitely a case of intentional shutdown.This PI from GM has more information about this strategy, and how to catch it taking place:
www.scannerdanner.com/media/kunena/attac...7/wssdiagnostics.pdf
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