P263A
MIL Control Circuit Low
Voltage on the malfunction indicator lamp control line is below the expected window. Usually a short to ground or a shorted bulb driver.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Bulb driver internally shortedPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- MIL Lamp
- Instrument Cluster
- Wiring Harness
P263A 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.