What are the common causes of P021C?

A faulty fuel injector on cylinder 9. A short or open in the cylinder 9 injector wiring. A faulty crankshaft or camshaft position sensor. Low fuel pressure from a weak pump. Dirty injectors on cylinder 9.

Compare cylinder 9 injection timing on a scan tool. Inspect the cylinder 9 injector wiring and connector. Check the crankshaft and camshaft position sensors. Check the fuel pressure and delivery. Replace the cylinder 9 injector if faulty. Clear the code and retest.

P021C

Cylinder 9 Injection Timing

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P021C means Cylinder 9 Injection Timing.

Check these first

A faulty fuel injector on cylinder 9
A short or open in the cylinder 9 injector wiring
A faulty crankshaft or camshaft position sensor
Low fuel pressure from a weak pump
Dirty injectors on cylinder 9

What to do next

Compare cylinder 9 injection timing on a scan tool
Inspect the cylinder 9 injector wiring and connector
Check the crankshaft and camshaft position sensors
Check the fuel pressure and delivery
Replace the cylinder 9 injector if faulty
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.