P1595
Speed Control Solenoid Circuit Open Or Shorted.
- Plymouth
- 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
P1595 on a Plymouth means the powertrain control module has detected an open or short circuit in the speed control (cruise control) solenoid circuit. The module monitors the circuit that drives the vacuum or vent solenoids used by the cruise control, and sets the code when the electrical readings do not match what it expects. The exact solenoid arrangement and wiring can vary by model and engine, so check the vehicle-specific wiring information.
Symptoms
- Cruise control does not engage or drops out unexpectedly
- Cruise control cannot hold a set speed
- Check engine light on
- Cruise control indicator light flashing or not lighting (if fitted)
- Code may appear with no other driveability complaints
Possible causes
- Damaged, chafed or corroded wiring between the powertrain control module and the speed control solenoidlikely
- Loose, corroded or damaged connector at the solenoid or control modulelikely
- Faulty speed control solenoid (internal open or short winding)likely
- Blown fuse or fault in the power supply to the cruise control circuitpossible
- Fault in the brake switch or other cruise control inputs affecting the circuitpossible
- Faulty powertrain control module driver circuitrare
How to diagnose
- Read all stored codes and freeze frame data, note whether the code is current or history, then clear it and see if it returns
- Check the relevant fuses and confirm the cruise control circuit has power
- Visually inspect the wiring and connectors from the solenoid back to the control module for chafing, heat damage, corrosion or water ingress
- Check the solenoid connector pins for tightness and corrosion
- Measure the solenoid winding resistance and compare it with the manufacturer's specification for that model
- Check the circuit for continuity, short to earth and short to supply using the wiring diagram
- Check the brake switch and cruise control switch operation as they can interact with the circuit
- If everything checks out, test the control module output before considering replacement
How to fix
- Repair or replace damaged wiring and secure it clear of heat and sharp edges
- Clean or replace corroded or damaged connectors and terminals
- Replace the speed control solenoid if its resistance is out of specification
- Replace blown fuses after finding and fixing the cause of the overload
- Repair or replace a faulty brake or cruise control switch if found at fault
- Replace or repair the powertrain control module only after confirming it is the cause
Can I keep driving?
Low severity
The car is normally safe to drive as only the cruise control is affected, but book it in for repair. Avoid relying on cruise control until it has been fixed.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.