P2688

Fuel Supply Heater Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–83 (est.)

Symptoms

Difficulty starting the engine in cold weather
Increased fuel consumption
Unstable engine operation at idle
Check Engine Light Illuminates

Causes

Open or short circuit in heater control circuit
Fuel heater malfunction
Problems with the relay or circuit fuse
Engine control unit malfunction
Corroded contacts or damaged connectors

How to Fix

Check the integrity of the heater control circuit
Check fuel heater resistance
Inspect the relays and circuit fuses
Check connectors and contacts for corrosion
Diagnose the engine control unit

Related codes

P2687 P2689 P2690