P0612
Fuel Injector Control Module Relay Control
A circuit fault on the relay that powers the injector driver module - either control line or contact integrity issue.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Relay control or contact faultCommon
Parts involved
- Fuel Injector Control Module
- Injector Module Relay
P0612 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.