P2687 — Fuel heater circuit has an electrical problem

The engine's fuel supply heater circuit is showing an electrical fault, either open or shorted. This heater helps maintain proper fuel temperature, especially in cold conditions, ensuring smooth engine operation.

Common causes

The cause is almost always one of a few things. Here they are — P2687 rarely comes from anything outside this list:

• Damaged or corroded wiring/connectors in fuel heater circuit
• Faulty fuel supply heater element
• Blown fuse related to fuel heater
• Defective engine control module (rare)
• Poor electrical ground connection

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and repair wiring and connectors for damage or corrosion
2. Check and replace blown fuses if found
3. Test and replace faulty fuel supply heater element
4. Verify grounds and clean connections
5. Replace engine control module only if all else fails

That is what holds for P2687 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.