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2009 Cadillac CTS Reduced Power and Check Engine Light

The throttle position sensor (TPS) on the Cadillac CTS-V is notorious for failure which causes:

  • Check engine light
  • Reduced Power message
  • OBD trouble code P2135

This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS.

To correct this issue, the wiring harness, connector, and throttle position sensor must be inspected, tested, and/or replaced. The most common cause is a faulty TPS.

Affected Model Years

This issue affects Cadillac CTS model years 2009, 2010, 2011, 2012, 2013, 2014, 2015, .

32 people reported this problem

    Cadillac CTS 2009 Common Problems