Cylinder 1 Injector Circuit High
The P0262 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 1. This typically means the injector driver circuit is shorted to voltage or the injector itself has an internal short. The ECM monitors the injector circuit for proper voltage and current; when the voltage is higher than expected, it sets this code. This can cause the injector to stay open or not function correctly, leading to fuel delivery issues.
01. Most Common Causes
- Faulty fuel injector on cylinder 1 (internal short)
- Short to voltage in the injector wiring or connector
- Damaged ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Poor fuel economy
- Possible engine knocking or hesitation
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: Measure resistance of cylinder 1 injector; compare to spec (typically 12-16 ohms).
Step 4: Check for voltage at the injector connector with key on; should be battery voltage on one pin.
Step 5: Perform a continuity test between the injector control wire and ground; if shorted, repair wiring.
Step 6: If wiring is good, swap injector with another cylinder and see if code follows; if so, replace injector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high injector circuit can cause misfires, poor performance, and potential damage to the catalytic converter or engine.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. An injector replacement is around $100-$250, plus diagnostic time.