OBD-II code · Powertrain (generic)
P0593 Cruise Control Multi-Function Input B Circuit High
Same as P0581 on input B. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0593?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.2 h
- Emissions test
- Usually unaffected
- Parts involved
- Cruise Control Stalk
Related codes
- P0581Cruise Control Multi-Function Input A Circuit High
- P0590Cruise Control Multi-Function Input B Circuit Stuck
- P0591Cruise Control Multi-Function Input B Circuit Range or Performance
- P0592Cruise Control Multi-Function Input B Circuit Low
- P0594Cruise Control Servo Control Circuit Open
- P0595Cruise Control Servo Control Circuit Low
- P0596Cruise Control Servo Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.