P23D7

Cylinder 2 Fuel Heater Control Circuit Low

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 low temperatures
Increased fuel consumption
Check Engine Light Is On
Possible misfire in cylinder 2

Causes

Open or short circuit in the heater control circuit
Poor contact in circuit connectors
Fuel heater malfunction
Problems with the engine control unit (ECU)
Corroded contacts or damaged wiring harness

How to Fix

Check the integrity of the heater control circuit
Inspect connectors and contacts for corrosion or damage
Check the resistance of the fuel heater
If necessary, replace the fuel heater
Check and replace wiring harness if necessary

Related codes

P23D8 P23D6 P23D9