Injector Circuit High Cylinder 8
The P0283 code indicates that the powertrain control module (PCM) has detected a high voltage or resistance in the injector circuit for cylinder 8. This typically points to a short to voltage, open circuit, or a faulty injector. The injector circuit includes the wiring, connectors, and the injector itself. A high circuit condition can cause the injector to remain open or not function properly, leading to misfires and poor engine performance.
01. Most Common Causes
- Faulty fuel injector on cylinder 8
- Short to voltage in injector wiring or connector
- Open circuit in injector wiring or connector
- Corroded or damaged injector connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine misfire on cylinder 8
- Check Engine Light illuminated
- Rough idle or hesitation
- Decreased fuel economy
- Possible engine knocking or pinging
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Visually inspect the injector wiring and connector for cylinder 8 for damage, corrosion, or loose connections.
Step 3: Measure resistance of injector 8 with a multimeter; compare to manufacturer specs (typically 12-16 ohms).
Step 4: Check for voltage at the injector connector with key on; should see battery voltage on one pin and PCM ground on the other.
Step 5: If wiring and injector check out, test the PCM output by swapping injector 8 with another cylinder and see if the code moves.
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 engine misfire, reduced performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether the injector needs replacement or just wiring repair.