Code P1558: Cruise System Problem SPS Indicated Low: Notes
PCM controlled cruise control system is designed to be self-monitored to ensure desired cruise servo position and actual cruise servo position are equal to one another. PCM will set Code P1558 when actual servo position is too low when maximum servo is commanded.
Code P1558 will set when the following conditions are present.
- Throttle angle less than 50 percent.
- Desired servo position is 90 percent.
- Actual servo position is less than 2 percent.
- Above conditions for 3 seconds.NOTE: Test numbers refer to numbers on diagnostic chart.
- Checks servo position sensor. If signal is not being received at PCM, use Code P1565 to diagnose problem.
- Verifies vacuum portion of cruise system is operational.
- Checks for faulty brake switch.