P256D OBD-II: Engine Idle Speed Selector Sensor/Switch Circuit High
P256D Severity
Will P256D go away on its own?
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
What causes OBD-II fault code P256D?
The Idle Control Valve (Idle Speed Selector overseas) controls the engine's idle speed. If the idle speed can not be properly maintained as requested by the engine computer, code P256D will be stored.
OBD II Fault Code
- OBD II P256D
OBD-II Code Engine may stall is defined as a Engine Idle Speed Selector Sensor/Switch Circuit High
The Idle Control Valve (Idle Speed Selector overseas) controls the engine's idle speed. If the idle speed can not be properly maintained as requested by the engine computer, code P256D will be stored.
Engine may stall Symptoms
- Engine may stall
Common Problems That Trigger the P256D Code
- Idle Air Control (IAC) valve failure
- Powertrain Control Module (PCM) failure
- Wiring issue
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