P1595
Speed Control Solenoid Circuit Open Or Shorted.
- Pontiac
- 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 a Pontiac, 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 solenoid driver and its wiring, and sets the code when the electrical readings do not match what it expects when the solenoid is commanded. The exact solenoid type and circuit layout vary by model and year, so check model-specific wiring information.
Symptoms
- Cruise control will not engage or set
- Cruise control cuts out or drops out unexpectedly
- Cruise control switch seems dead or unresponsive
- Cruise control indicator light not working or flashing
- Check engine light or service engine soon light on
Possible causes
- Damaged, chafed or corroded wiring in the speed control solenoid circuitlikely
- Loose, corroded or damaged connector at the solenoid or control modulelikely
- Faulty speed control solenoid or servo with an open or shorted coillikely
- Faulty brake switch or cruise cancel switch affecting the circuitpossible
- Blown fuse or fault in the circuit's power or earth supplypossible
- Internal fault in the powertrain control module driverrare
How to diagnose
- Read the stored codes and freeze frame data, note any other codes, then clear and see if P1595 returns
- Check the relevant fuses for the cruise control circuit
- Visually inspect the solenoid or servo, its wiring and connectors for chafing, heat damage, water ingress and corrosion
- Check the vacuum or mechanical connections to the servo if fitted, as damage can accompany electrical faults (depends on model)
- Measure the solenoid coil resistance and compare with the manufacturer's specification for your model
- Check the circuit for continuity, short to earth and short to supply between the solenoid and the control module using the wiring diagram
- Check the brake and clutch switch operation and their wiring where they feed the cruise circuit
- Confirm the power and earth supplies at the solenoid connector before suspecting the control module
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 faulty speed control solenoid or servo assembly
- Replace a faulty brake or cancel switch if it is found to be at fault
- Replace blown fuses only after finding and fixing the cause of the overload
- Replace or repair the powertrain control module only after all wiring and components are proven good
Can I keep driving?
Low severity
The car is normally safe to drive, as this fault only affects cruise control. Book it in for repair at your convenience, and use the throttle manually until it is fixed.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.