P21BE — Cylinder 9 injection timing during a cold start — injection-timing fault

P21BE concerns cylinder 9 injection timing during a cold start. The monitor reports a problem with injection timing under the named operating condition. The definition limits the monitor to cylinder 9 and cold-start operation. It does not state a universal timing angle or distinguish an electrical from a mechanical cause.

Affected system: Fuel-injection control

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Fuel supply or pressure issue, restricted injector, actuator fault, connector or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Repair the verified cause and confirm the code does not return

Also written as: P21BE-00, P21BE00 (some scan tools add the fault-type byte, e.g. -00).