P1271: Cylinder #1 Fuel Injector Circuit Open
The P1271 code indicates an open circuit in the fuel injector for cylinder #1, specifically between the high and low sides of the injector driver circuit. This means the injector is not receiving the proper voltage or ground to operate, preventing fuel delivery to cylinder #1. The engine control module (ECM) monitors the injector circuit and sets this code when it detects an open condition, which can cause a misfire, rough idle, and reduced engine performance.
01. Most Common Causes
- Faulty fuel injector on cylinder #1
- Open or shorted wiring in the injector circuit
- Damaged connector at the injector or ECM
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Possible hesitation or lack of power
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: Use a multimeter to check resistance of injector #1 (typically 11-18 ohms).
Step 4: Check for voltage and ground at the injector connector with key on.
Step 5: Perform a continuity test between the injector and ECM.
Step 6: If all checks pass, swap injector #1 with another cylinder to 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 for extended periods as the misfire can damage the catalytic converter and cause poor performance.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on whether the injector or wiring needs replacement.