OBD-II code · Powertrain (generic)
P0594 Cruise Control Servo Control Circuit Open
The servo motor that drives the cruise control throttle actuator has an open control circuit. The ECU cannot drive the servo - cruise control is unavailable.
Is it safe to drive with P0594?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in motor or harness
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Cruise Control Servo
Related codes
- P0591Cruise Control Multi-Function Input B Circuit Range or Performance
- P0592Cruise Control Multi-Function Input B Circuit Low
- P0593Cruise Control Multi-Function Input B Circuit High
- P0595Cruise Control Servo Control Circuit Low
- P0596Cruise Control Servo Control Circuit High
- P0597Thermostat Heater Control Circuit Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.