P1275: Cylinder #5 Injector Circuit Open
The P1275 code indicates an open circuit between the high and low sides of the fuel injector for cylinder #5. This means the injector's electrical circuit is incomplete, preventing the injector from opening. The engine control module (ECM) detects this fault when it cannot properly control the injector, often due to a broken wire, damaged connector, or failed injector. This condition causes cylinder #5 to misfire, leading to rough idle, reduced power, and increased emissions.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire, rough idle, or hesitation
- Reduced engine power and poor acceleration
- Increased fuel consumption and emissions
2. Most Common Causes
- Open or shorted wiring in the injector circuit for cylinder #5
- Faulty fuel injector on cylinder #5
- Damaged connector at the injector or ECM
- Corrosion or poor electrical connection
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P1275 and check for related codes.
Step 2: Visually inspect the wiring and connector for cylinder #5 injector for damage, corrosion, or loose connections.
Step 3: Measure resistance across the injector terminals; compare to specifications (typically 12-16 ohms).
Step 4: Check for voltage and ground at the injector connector with the key on; if missing, trace circuit back to ECM.
Step 5: Perform a continuity test on the injector circuit wires from the injector to the ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with P1275 as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter due to unburned fuel.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for diagnostic and simple wiring repairs, but can be higher if the injector or ECM replacement is needed.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.