P23D1

Cylinder 1 Fuel Heater Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–67 (est.)

Symptoms

Difficulty starting the engine in cold weather
Unstable engine idling
Reduced engine power
Increased fuel consumption
Check Engine Light Illuminates

Causes

Broken wire in the heater control circuit
Poor connection or corrosion in connectors
Malfunction of the heating element of cylinder 1 itself
Wiring harness damage
Malfunction of the engine control unit (rare)

How to Fix

Visual inspection of heater circuit wiring and connectors
Checking the resistance of the heating element
Checking the voltage at the heater connectors
Replacing damaged wires or connectors
Replacing a faulty cylinder 1 fuel heater

Related codes

P23D2 P23D3 P23D4