P23C9

Fuel Heater Control Module Power Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–111 (est.)

Symptoms

Difficulty starting the engine in cold weather
Unstable engine operation at idle
Reduced engine power
Increased fuel consumption
Check Engine indicator on the dashboard

Causes

Malfunction of the fuel heating module
Open or short circuit in control circuit
Problems with the fuel heating relay
Engine control unit (ECU) malfunction
Corroded contacts or damaged connectors

How to Fix

Check the integrity of the heating module control circuit
Check the functionality of the fuel heating relay
Diagnose the fuel heating module
Check connectors and connections for corrosion
If necessary, replace the fuel heating module

Related codes

P23C8 P23CA P23CB