P1276: Cylinder #6 Injector Circuit Open (High to Low Side)
The P1276 code indicates an open circuit between the high side and low side of the fuel injector for cylinder #6. This means the injector's electrical circuit is incomplete, preventing the injector from opening properly. The ECM monitors the injector circuit for continuity; when it detects an open, it sets this code. Common causes include a faulty injector, damaged wiring, or poor electrical connections.
1. Symptoms You Will Notice
- Misfire on cylinder #6
- Rough idle or engine vibration
- Check Engine Light illuminated
- Reduced engine power and fuel economy
2. Most Common Causes
- Faulty fuel injector for cylinder #6
- Open or shorted wiring in the injector circuit
- Corroded or loose connector at the injector
- ECM internal fault (rare)
3. 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 measure resistance across injector #6 (typically 11-18 ohms).
Step 4: Check for voltage at the injector connector with key on (should see battery voltage on one pin).
Step 5: Perform a continuity test between the injector and ECM to identify an open circuit.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a misfire can damage the catalytic converter and cause further engine issues.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but if the injector needs replacement, parts and labor can range from $200-$500.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.