Injector Circuit High - Cylinder 1
The P0262 code indicates that the powertrain control module (PCM) has detected a voltage signal from the fuel injector circuit for cylinder 1 that is higher than the expected range. This typically points to a short to voltage, a faulty injector, or a wiring issue. The injector circuit includes the injector itself, wiring, connectors, and the PCM driver. A high voltage condition can cause the injector to stay open, leading to excessive fuel delivery, misfires, and potential engine damage.
1. Most Common Causes
- Short to voltage in injector wiring or connector
- Faulty fuel injector (internal short)
- Damaged PCM or injector driver circuit
- Corroded or loose connector at injector or PCM
2. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Poor fuel economy
- Engine may run rich (exhaust smell, black smoke)
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 or corrosion.
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 on one pin).
Step 5: Perform a continuity test from injector to PCM and check for shorts to power or ground.
Step 6: If wiring is OK, swap injector with another cylinder and see if code follows.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high injector circuit can cause excessive fuel delivery, leading to catalytic converter damage, engine misfire, and potential hydro-lock. Have the issue diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. If the injector needs replacement, parts cost $50-$100 and labor $50-$100. Wiring repairs are usually less expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.