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P1222

Injector Control Circuit Intermittent.

  • Saturn
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
2
AreaFuel and air metering (injector circuit)
22
FaultThe specific fault in that area

What it means

P1222 on a Saturn means the engine control module has detected an intermittent fault in an injector control circuit. The module monitors the injector driver circuit and saw a drop-out, open or short that came and went rather than staying permanently present. Which injector or bank is affected, and how the circuit is arranged, depends on the model and engine.

Symptoms

  • Intermittent misfire or rough running, especially at idle
  • Hesitation or stumbling under acceleration
  • Occasional hard starting or extended cranking
  • Engine misfiring then running normally again
  • Check engine light on, possibly flashing during a misfire
  • Poor fuel economy

Possible causes

  • Loose, corroded or damaged connector at an injector or at the control modulelikely
  • Chafed, stretched or broken injector wiring causing an intermittent open or shortlikely
  • Injector with an intermittently failing coil winding or internal shortpossible
  • Poor power or ground supply to the injector circuit, such as a bad relay or fuse connectionpossible
  • Water ingress or oil contamination in the engine harnesspossible
  • Fault inside the engine control module injector driverrare

How to diagnose

  1. Read all stored and pending codes and record the freeze frame data to see engine speed, load and temperature when it set
  2. Check for other misfire or injector codes that point to a specific cylinder or bank
  3. Inspect injector connectors and the control module connector for looseness, corrosion, bent pins or moisture
  4. Inspect the injector harness along its route for chafing, heat damage and rubbing points
  5. Wiggle test the harness and connectors with the engine running while watching for misfire or live data changes
  6. Measure injector coil resistance and compare with the manufacturer specification for that engine
  7. Check the injector circuit power supply, fuse and ground connections for voltage drop
  8. Use an injector pulse test or noid-style check on the affected circuit to confirm the driver signal is steady

How to fix

  • Clean, repair or replace faulty connectors and terminals
  • Repair or replace damaged sections of wiring, securing the harness clear of heat and rubbing
  • Replace an injector that fails resistance or pulse testing
  • Repair poor power or ground supply connections, or replace a faulty relay
  • Dry out and treat water-affected connectors, and fix the source of the leak
  • Replace or repair the control module only after all wiring and injectors are proven good

Can I keep driving?

Medium severity

The car can usually be driven short distances, but an intermittent injector fault can cause misfires that may damage the catalytic converter. Get it checked soon, and stop driving if the check engine light flashes or the engine runs very roughly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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