P2687
Fuel Supply Heater Control Circuit / Open
The controller cannot drive the diesel fuel filter or supply line heater. In cold weather diesel waxing can clog the filter.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open heater elementCommon
- Failed heater relayPossible
Parts involved
- Fuel Supply Heater
- Heater Relay
- Wiring Harness
P2687 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.