Cylinder 12 Injector B Circuit High

Where it lives

For P21F3, the circuit described runs through the injector. The description of P21F3 puts it on cylinder 12.

Check these first

• A short to voltage on the cylinder 12 injector B control wire
• A failed cylinder 12 injector B coil with high resistance
• Chafed cylinder 12 injector B wiring near a power feed
• A PCM driver fault for cylinder 12 injector B

What to do next

1. Read cylinder 12 injector B circuit status on a scan tool
2. Test the cylinder 12 injector B control wire for a short to voltage
3. Inspect the cylinder 12 injector B harness for chafe
4. Measure cylinder 12 injector B coil resistance
5. Replace the cylinder 12 injector if the wiring tests good
6. Clear the code and retest

Look up another code