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Code P063, Vehicle Speed & Set Speed Difference Too High: Action

WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

PCM disengages cruise control.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. If Code P075 is set, diagnose code first because it can cause other speed related problems.
  2. Checks if cruise control feedback is a value is zero to 6 or greater.
  3. Checks if PCM and related circuit to cruise control servo is okay (4.6-5.1 volts).
  4. Checks if circuit No. 398 for a short to voltage.
  5. Checks if cruise control servo is able to respond correctly to signal from PCM.
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