Injector Circuit Malfunction - Cylinder 5
The P0205 code indicates a problem in the electrical circuit of the fuel injector for cylinder 5. This can be caused by a faulty injector, wiring issues, or a problem with the engine control module (ECM). The injector circuit includes the injector itself, the wiring harness, connectors, and the ECM driver. When the ECM detects an open or short circuit, or a resistance out of spec, it sets this code. This can lead to a misfire, rough idle, and reduced engine performance.
1. Most Common Causes
- Faulty fuel injector for cylinder 5 (open coil or internal short)
- Damaged, corroded, or disconnected injector wiring or connector
- Short to ground or short to voltage in the injector wiring
- Open circuit in the harness between the ECM and the injector
- Poor connection at the injector or ECM connector
- Internal failure of the injector driver in the ECM/PCM
- Defective fuel pump relay (if applicable to the circuit)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Engine hesitation or lack of power
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the injector connector and wiring for damage or corrosion.
Step 3: Use a multimeter to check injector resistance (typically 12-16 ohms).
Step 4: Perform a noid light test to verify injector pulse from ECM.
Step 5: Swap injector with another cylinder to see if the code moves.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine misfire, catalytic converter damage, and poor performance. Short trips to a repair shop are okay.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the injector or ECM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.