Code P099, Cruise Control Servo Applied Not In Cruise: Action

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

PCM disables cruise control and PCM will disable fuel to individual cylinders to reduce engine power.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks if PCM can control cruise control solenoid.
Checks if cruise control position sensor is working correctly.
Checks if cruise control servo will extend fully. If servo does not extend fully, check circuit No. 205 for a short to voltage.

Fig 1: Code P099 Schematic, Cruise Control Servo Applied Not In Cruise

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P099 Diagnostic Flow Chart, Cruise Control Servo Applied Not In Cruise

Courtesy of GENERAL MOTORS CORP.