P218A
Throttle Actuator B Control System - Idle Position Not Learned
Throttle Actuator B Control System - Idle Position Not Learned: the control module has detected this fault condition.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Common causes
Ordered by how often each turns out to be the cause.
- Idle relearn procedure not completedCommon
Parts involved
- Throttle Actuator B
P218A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.