P23DE

Cylinder 4 Fuel Heater Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Difficulty starting the engine in cold weather
Unstable engine operation at idle
Increased fuel consumption
Check Engine Light Is On
Reduced engine power

Causes

Short circuit in fuel heater circuit
Malfunction of the 4th cylinder fuel heater
Problems with wiring harness or contacts
Engine control unit malfunction
Corrosion or oxidation of contacts

How to Fix

Check fuel heater circuit for short circuit
Test the resistance of the 4th cylinder heater
Inspect the wiring harness and contacts for damage
Check the operation of the engine control unit
Replace faulty fuel heater if necessary

Related codes

P23DD P23DF P23E0