OBD-II code · Powertrain (generic, extended)
P256E Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic
The idle-speed selector signal jumps or drops out — usually a worn rotary contact or vibration. 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 P256E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWorn rotary contact
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Idle Speed Selector Switch
Related codes
- P256AEngine Idle Speed Selector Sensor/Switch Circuit/Open
- P256BEngine Idle Speed Selector Sensor/Switch Range/Performance
- P256CEngine Idle Speed Selector Sensor/Switch Circuit Low
- P256DEngine Idle Speed Selector Sensor/Switch Circuit High
- P256FA/C Request B Circuit Range/Performance
- P2570Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
- P2571Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.