P1561
Cruise Vent Solenoid.
- Chrysler
- Powertrain
- Manufacturer code
- Low severity
How this code is built
- P
- SystemPowertrain
- 1
- Defined byThe manufacturer
- 5
- AreaVehicle speed, idle control and auxiliary inputs
- 61
- FaultThe specific fault in that area
What it means
P1561 on a Chrysler relates to the cruise control vent solenoid circuit. The powertrain control module saw a fault in the vent solenoid circuit, such as an open circuit, short or a driver that did not respond as commanded. The exact circuit test and set conditions vary by model and engine, so check the correct service information.
Symptoms
- Cruise control not working or cancelling unexpectedly
- Cruise control will not set or hold speed
- Cruise control will not release smoothly when the brake is pressed
- Check engine light on
- Cruise control indicator flashing or not lighting (varies by model)
Possible causes
- Faulty cruise control vent solenoid or servo assemblylikely
- Damaged, chafed or corroded wiring to the vent solenoid (open circuit or short to earth or voltage)likely
- Poor connection at the solenoid or servo connector, such as corroded or loose terminalspossible
- Split, disconnected or blocked vacuum line to the servo causing related faults (where a vacuum-operated system is fitted)possible
- Faulty brake switch or related cruise control inputs affecting the circuit (model dependent)rare
- Internal fault in the powertrain control module driverrare
How to diagnose
- Read all stored and pending codes and note the freeze frame data, then check for any other cruise or brake switch codes.
- Visually inspect the cruise servo or vent solenoid, its vacuum lines and the wiring harness for damage, chafing, heat or rubbing.
- Disconnect and inspect the solenoid connector and the powertrain control module connector for corrosion, bent or pushed-back pins and water ingress.
- Measure the solenoid coil resistance and compare it with the specification for the specific model and engine.
- Check the supply voltage and earth at the solenoid connector with the ignition on, following the wiring diagram.
- Wiggle-test the harness while monitoring the circuit for intermittent faults.
- Check the brake switch operation and its signal, as the cruise system depends on it.
- Clear the code and road test to see if it returns, confirming the repair.
How to fix
- Replace the cruise control vent solenoid or servo assembly if its resistance or operation is out of specification.
- Repair or replace damaged wiring, correcting any open circuit or short.
- Clean or repair connector terminals, or replace the connector if corroded or loose.
- Replace split or disconnected vacuum lines and secure them properly where fitted.
- Replace a faulty brake switch if it is found to be defective.
- Replace or repair the powertrain control module only after all wiring and component faults have been ruled out.
Can I keep driving?
Low severity
The car can normally be driven as the fault only affects cruise control. Book it in for repair, and avoid relying on cruise control until it is fixed.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.