🔧 Code P1227 CADILLAC – Fuel Injector #2 Problem
📌 Meaning of Code P1227
Code P1227 is defined when the Engine Control Module (ECM) detects an incorrect current in fuel injector #2 circuit.
The ECM controls each injector by providing power voltage and grounding the control circuit to activate injection. If an anomaly is detected in the injector circuit (such as a short circuit, open circuit, or abnormal current), the DTC P1227 is stored and the injector may be deactivated to protect the engine.
⚠️ Possible Symptoms
- 🔥 Engine light on (Check Engine)
- Irregular idle
- Engine misfiring or running on fewer cylinders
- Loss of power or poor acceleration
- Excessive fuel consumption
📍 Possible Causes of Code P1227 CADILLAC
- 💥 Faulty fuel injector #2
- 🔌 Injector #2 harness open or shorted
- ⚡ Faulty electrical connection at injector connector
- 💻 Faulty ECM (less common, but possible)
🧰 How to Fix Code P1227?
- Visual Inspection:
- Check the condition of injector 2 wiring harness
- Look for broken, bent, or corroded pins on connectors
- Test Injector:
- Use a multimeter to measure injector resistance (normal values: typically between 12–16 ohms depending on engine)
- Verify proper power supply and control
- Test Circuit:
- Check continuity between ECM and injector
- Look for short circuits to ground or +12V
- Replace injector if found faulty
- Check ECM or reprogram if no hardware issues found elsewhere
💬 Tip
Sometimes this type of failure can be intermittent, caused by a poor connection. A good tip is to gently tap the connector with engine running and observe if the engine reacts (temporary misfires).