P263B
MIL Control Circuit High
Voltage on the malfunction indicator lamp control line is above the expected window. Typical causes are a short to battery or an open lamp.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to B+Common
- Burnt-out MIL bulbPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- MIL Lamp
- Instrument Cluster
- Wiring Harness
P263B 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.