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Discussion Starter · #1 ·
Hello guys, my 2005 TB recently started throwing 2 wheel speed sensor codes.

C0055 right rear wheel speed sensor
C0040 right front wheel speed sensor

It just seems strange that both wheels started throwing the codes at the same time. Any suggestions on how to approach this? I just don't want to replace the sensors when it's something else
 

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2002 chevy trailblazer_lt
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The speed sensors are all connected to the EBCM. Maybe have a quick look at the harness connector there? Maybe you ran over something that smacked the connector? I can't say I have ever looked there to see if it is even vulnerable or well protected. Also maybe remove and clean the ground connector to the EBCM. That is a common issue which even had a TSB in 04 I think.

What are the exact codes by the numbers?
 

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2004 GMC Envoy SLT 4.2
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I had something very close to your codes pop up , only for the left side .
I removed and cleaned the front sensor and removed rust and buildup from it's shim and the sensor mounting point on the hub .
Reinstalled the sensor and both codes disappeared .
 

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Discussion Starter · #4 ·
I had something very close to your codes pop up , only for the left side .
I removed and cleaned the front sensor and removed rust and buildup from it's shim and the sensor mounting point on the hub .
Reinstalled the sensor and both codes disappeared .

Interesting..you had the code for the rear sensor as well? Also was your abs light on? Mine is not
 
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