Cylinder 8 Injector Circuit High
The P0283 code indicates that the Engine Control Module (ECM) has detected a high voltage or resistance in the electrical circuit for the fuel injector on cylinder 8. This typically means the injector circuit is open, shorted to voltage, or has excessive resistance, preventing proper injector operation. Common causes include a faulty injector, damaged wiring, or a poor electrical connection.
1. Most Common Causes
- Open coil in cylinder 8 injector (infinite resistance)
- Short to battery voltage in the injector control wire (PWM/ground signal)
- Open circuit in the injector power or control wire
- Damaged, loose, or corroded terminals at the injector connector
- Internal failure of the injector driver (transistor) inside the PCM
2. Symptoms You Will Notice
- Engine misfire on cylinder 8
- Rough idle or hesitation
- Check Engine Light illuminated
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector connector and wiring for damage.
Step 3: Measure resistance of injector (typically 12-16 ohms).
Step 4: Check for voltage at injector connector with key on (should be battery voltage).
Step 5: Perform a injector balance test or swap injectors to isolate the issue.
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 reduced performance. Have it diagnosed promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Injector replacement parts range from $50-$200, plus labor. Total repair can be $150-$400.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.