What are the common causes of P21BE?

A blown fuse protecting the cylinder 9 injector circuit. A weak battery or a poor charging system. Corroded battery terminals or a ground strap. A damaged or chafed cylinder 9 injector harness. A loose or corroded cylinder 9 injector connector.

Read the cylinder 9 injection timing on a scan tool. Check and replace any blown fuse. Test the battery and the charging system. Clean the battery terminals and grounds. Repair or replace the cylinder 9 injector harness or connector. Clear the code and retest.

P21BE

Cold Start Cylinder 9 Injection Timing

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P21BE means Cold Start Cylinder 9 Injection Timing.

Check these first

A blown fuse protecting the cylinder 9 injector circuit
A weak battery or a poor charging system
Corroded battery terminals or a ground strap
A damaged or chafed cylinder 9 injector harness
A loose or corroded cylinder 9 injector connector

What to do next

Read the cylinder 9 injection timing on a scan tool
Check and replace any blown fuse
Test the battery and the charging system
Clean the battery terminals and grounds
Repair or replace the cylinder 9 injector harness or connector
Clear the code and retest

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Updated

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