2009 - 2013 Corvette: Service Bulletin: #PIT4683F: Additional Wheel Speed Sensor Diagnostics - (Jul 31, 2012)

#PIT4683F: Additional Wheel Speed Sensor Diagnostics - (Jul 31, 2012)

Subject Additional Wheel Speed Sensor Diagnostics
Models 2008 - 2013 Buick Enclave
2007 - 2013 Cadillac Escalade, Escalade ESV, Escalade EXT 2009 Cadillac XLR
2007 - 2013 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2008 - 2012 Chevrolet Express
2010 - 2013 Chevrolet Camaro
2009 - 2013 Chevrolet Corvette, Traverse
2007 - 2013 GMC Acadia, Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2008 - 2013 GMC Savana
2008 - 2009 Pontiac G8
2007 - 2010 Saturn Outlook
With any of the following DTCs: C0035 C0040 C0045 C0050 C0245 P0609

This PI was superseded to update model and model years. Please discard PIT4683E.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.


When diagnosing a wheel speed sensor concern it may be found that the 12 volt Wheel Speed Sensor Supply Voltage circuit from the EBCM has no voltage.  This may incorrectly lead to the replacement of the EBCM because there is no voltage to the WSS.  When the EBCM has a fault with a WSS, it internally turns off the supply voltage to the WSS.

Note: The only part of this PI that applies to the Vans or HD pickups is Step 2 under the Recommendation.


Below are some additional diagnostic tips to help diagnose WSS concerns after the SI ″Circuit Testing″ has been performed:

Note: These tests should only be performed after the SI2000 ″Circuit/System Testing″ is complete; and prior to an EBCM replacement.

  1. To test for the ″12 volt Wheel Speed Sensor Supply Voltage″ from the EBCM with a WSS fault present, perform the following test (This step does not apply to the Vans or HD pickups).
  • Component Testing of the Wheel Speed Sensor (Applies to All Models Listed)

    Note: This procedure is very polarity sensitive and if the WSS is connected in reverse polarity while performing the below procedure the WSS can be permanently damage. Please make sure the B+ is connected to the WSS Supply Voltage and the ground (Fluke 87 DVOM) to the WSS Low Signal Return. Use the appropriate SI wiring diagrams to determine the WSS Supply Voltage and WSS Low Signal Return.

  • Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.


    Article ID: 1333
    Created: March 14, 2017
    Last Updated: March 16, 2017

    Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/2009-2013-corvette-service-bulletin-pit4683f-additional-wheel-speed-sensor-diagnostics-jul-31-2012-1333.html