JEEP P1596 Causes And Diagnostic steps
SYMPTOM
P1596-SPEED CONTROL SWITCH ALWAYS HIGH
WHEN MONITORED
With the ignition key on.
SET CONDITION
An open circuit is detected in the speed control on/off switch circuit. The circuit must be above 4.8 volts for more than 2 minutes to set the DTC.
POSSIBLE CAUSES
- Speed control switch ground circuit open clockspring to S/C switch
- Speed control switch ground circuit open PCM to clockspring
- Clockspring Signal/Ground circuit open
- S/C wiring harness observable defect
- Speed control on/off switch defective
- Speed control sw sig ckt open PCM to clock spring
- Speed control sw sig ckt open clockspring to S/C switch
- Speed control switch signal ckt shorted to voltage
- Powertrain control module defective
Often times it as is simple as replacing the clock spring and everything starts working right again.
Just go through the diag and make sure. You don’t want to just throw parts at it.
Diag step by step below: (just click the picture to enlarge)
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