P1595
Speed Control Solenoid Circuit Open Or Shorted.
- Jeep
- Powertrain
- Manufacturer code
- Low severity
How this code is built
- P
- SystemPowertrain
- 1
- Defined byThe manufacturer
- 5
- AreaVehicle speed, idle control and auxiliary inputs
- 95
- FaultThe specific fault in that area
What it means
On Jeep models, P1595 means the powertrain control module has detected an open or shorted circuit in the speed control (cruise control) solenoid circuit. The module monitors the vent and vacuum solenoid drivers and sets the code when the electrical feedback does not match what it commanded. The exact solenoid arrangement depends on the model and year.
Symptoms
- Cruise control will not engage or set
- Cruise control drops out unexpectedly
- Cruise control surges or cannot hold speed
- Check engine light on
- Cruise control switch seems dead or inconsistent
Possible causes
- Damaged, chafed or corroded wiring to the speed control solenoids or servolikely
- Loose, corroded or pushed-out pins at the solenoid, servo or PCM connectorslikely
- Faulty speed control servo or vacuum/vent solenoid with an open or shorted coillikely
- Fault in the brake switch or cruise control switch circuit affecting the systempossible
- Blown fuse or a power or earth supply problem in the cruise circuitpossible
- Internal fault in the powertrain control module driver circuitrare
How to diagnose
- Read all stored and pending codes and note the freeze frame data, then check for related cruise or brake switch codes
- Check the relevant fuses and inspect the cruise control wiring for chafing, heat damage or rodent damage, especially near the servo and bulkhead
- Inspect the connectors at the speed control servo or solenoids and at the PCM for corrosion, bent or loose pins
- Check the vacuum lines and servo for splits or leaks, as the layout varies by model and engine
- Measure the solenoid coil resistance and compare it with the manufacturer specification for your model
- Check the supply voltage and earth at the solenoid connector with the ignition on
- Test the wiring between the solenoid and the PCM for continuity and for short to earth or voltage
- Clear the code and road test to confirm whether it returns
How to fix
- Repair or replace damaged wiring and restore proper insulation
- Clean or repair the connectors and terminals, or replace them if corroded or damaged
- Replace the faulty speed control servo or solenoid
- Replace faulty cruise control or brake switches if they are found at fault
- Restore the correct fuse, power or earth supply after finding the cause of the fault
- Repair or replace the PCM only after wiring and components are proven good
Can I keep driving?
Low severity
The car is safe to drive as only the cruise control is affected, but it will not work reliably. Book it in at your convenience and have it fixed before the next MOT or emissions check.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.