Cylinder 3 Fuel Heater Control Circuit/Open

What to check first

For P23D9, check the wiring and connector on this circuit first, since a broken terminal gives the same reading as a failed part.

Check these first

• P23D9: Failing ignition coil, spark plug, or spark plug wire
• P23D9: Faulty crankshaft or camshaft position sensor
• P23D9: Wiring or connector damage in the ignition circuit
• P23D9: Low compression or engine mechanical wear
• P23D9: Incorrect ignition timing or a stretched timing chain

What to do next

P23D9 is a fault in the ignition and misfire system. The steps below are general, so what actually failed on your vehicle may not be what P23D9 names.

1. P23D9: Read misfire counts and freeze frame data with an OBD-II scanner
2. P23D9: Test spark output and inspect spark plugs and coils
3. P23D9: Check crankshaft and camshaft position sensor signals while cranking
4. P23D9: Swap suspect ignition parts between cylinders to see if the fault moves
5. P23D9: Compression test if the issue persists on the same cylinder

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