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 driver circuit for cylinder #6. This typically means the injector coil has failed (open winding) or there is a wiring/connector issue between the ECM and the injector. The ECM monitors the injector circuit and detects when the expected current flow is interrupted, triggering this code. This can cause a misfire, rough idle, and reduced engine performance.
01. Most Common Causes
- Faulty fuel injector (open coil) on cylinder #6
- Open or shorted wiring in the injector circuit
- Corroded or damaged connector at injector or ECM
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire on cylinder #6
- Rough idle, hesitation, or loss of power
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P1276 is present.
Step 2: Visually inspect injector #6 connector and wiring for damage or corrosion.
Step 3: Measure resistance across injector #6 terminals; should be 12-16 ohms (typical). If open (OL), replace injector.
Step 4: Check for 12V at injector harness with key on; if missing, check fuse and wiring.
Step 5: Use a noid light to test injector pulse; if no flash, suspect wiring or ECM issue.
04. Commonly Affected Makes
05. 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 poor performance. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for a single injector replacement, plus diagnostic time. Labor may add $100-$200 depending on vehicle.