OBD
P036F
Ignition H Control Signal Circuit High
What it means
P036F stands for Ignition H Control Signal Circuit High. P036F is a P code, so the fault sits in the engine, transmission and emissions systems. For P036F, the second digit places it in ignition and misfire. For P036F, work through the cause list below, cheapest checks first.
What to check first
For P036F, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.
Check these first
- P036F: Failing ignition coil, spark plug, or spark plug wire
- P036F: Faulty crankshaft or camshaft position sensor
- P036F: Wiring or connector damage in the ignition circuit
- P036F: Low compression or engine mechanical wear
- P036F: Incorrect ignition timing or a stretched timing chain
What to do next
P036F 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 P036F names.
- P036F: Read misfire counts and freeze frame data with an OBD-II scanner
- P036F: Test spark output and inspect spark plugs and coils
- P036F: Check crankshaft and camshaft position sensor signals while cranking
- P036F: Swap suspect ignition parts between cylinders to see if the fault moves
- P036F: Compression test if the issue persists on the same cylinder
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.