P2689

Fuel Supply Heater Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Difficulty starting the engine in cold weather
Unstable engine operation at idle
Increased fuel consumption
Check Engine Light on Dashboard
Possible misfires

Causes

Fuel heater malfunction
Open or short circuit in control circuit
Heater relay problems
Engine control unit malfunction
Oxidation of contacts in the circuit

How to Fix

Check the condition of the fuel heater
Check the integrity of the wiring and contacts in the circuit
Check the functionality of the heater relay
Check fuses associated with the heating circuit
If necessary, replace the fuel heater

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