Injector Circuit Malfunction - Cylinder 5
The P0205 code indicates a malfunction 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 range, it sets this code. This can lead to misfires, poor fuel economy, and potential catalytic converter damage if not addressed.
01. Most Common Causes
- Faulty fuel injector on cylinder 5
- Open or short circuit in the injector wiring harness
- Corroded or damaged connector at the injector or ECM
- Failed ECM (rare)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Decreased fuel economy
- Engine hesitation or lack of power
03. 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 11-18 ohms).
Step 4: Perform a power and ground test at the injector connector with the key on.
Step 5: Swap the injector with another cylinder to see if the code moves.
Step 6: If wiring and injector are good, test the ECM driver circuit.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause misfires, damage the catalytic converter, and reduce fuel economy. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a simple wiring fix or injector replacement. Injector replacement parts cost $50-$100, plus labor.