This TSB applies to 2008-2010 Cadillac CTS vehicles that display DTCs C0035, C0040, C0045 and/or C0050.

When technicians perform a component level sensor test, the reversed signal polarity markings on wheel speed sensor connectors could result in misdiagnosis and possibly failing a good part. GM part numbers affected include 25996837, 25996838 and 25996839. 

Terminal 1 may be marked as positive (+) and terminal 2 may be marked negative (-), which indicates a mis-built connector.

Be aware that wheel speed sensor connectors may have been mis-built with reverse polarity markings.

Be aware that wheel speed sensor connectors may have been mis-built with reverse polarity markings.

The correct production connectors are built with terminal 1 as negative and terminal 2 as positive.

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