P1222 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1222 Code failures by brands

P1222 GMC, CHEVROLET, CADILLAC, BUICK: INJECTOR CONTROL CIRCUIT 1 INTERMITTENT

Description of DTC code P1222

In modern vehicle engines, fuel injection is controlled electronically. An electronic magnet is activated to drive a spring that accesses or limits fuel delivery.

The cylinders in turn receive the fuel directly in the compression process. However, in some systems, the fuel together with air is premixed in the intake stroke.

The P1222 OBDII fault code is a code that brands such as GMC, Chevrolet, Cadillac, and Buick use to indicate that the Powertrain Control Module (PCM) detected an incorrect voltage potential in one of the injector drive circuits while the engine was running. This code is usually accompanied by DTC P0200 if a component or circuit failure is found.

Symptoms of fault code P1222

  • Check Engine Lamp illuminated.
  • The engine is detonating.
  • Limited throttle response.
  • Reduced fuel efficiency.

Causes of OBD2 P1222

The P1222 OBD2 diagnostic code is set by one of the following factors:

  • Fuel injector 1 wires could be damaged.
  • Injector 1 circuit connections may be faulty causing a short circuit.
  • Fuel injector 1 may be in poor condition.
  • Defects in the oil control valve.
  • Short circuit in the VCT (solenoid valve).
  • Low or dirty oil level in the engine.
  • Damaged on-board computer.
  • PCM error

Possible solutions of the DTC code P1222

To troubleshoot the DTC P1222 OBDII code you must do the following:

  • Consult the Technical Service Bulletins.
  • Verify the good condition of the fuel injector circuit wires 1. If in one of these you discover wear or burns, make the corresponding repairs.
  • Inspect the electrical circuit connections of injector 1 and check them for common damage. If you discover an open or shorted circuit, it is necessary to make the applicable corrections.
  • Check the fuel injector 1 for blockages. If you determine that the fuel injector 1 is damaged, proceed to replace it.

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