Cylinder 12 Injector Circuit Low
The P0294 code indicates that the powertrain control module (PCM) has detected a low voltage or resistance condition in the electrical circuit of the fuel injector for cylinder 12. This typically means the injector circuit is drawing less current than expected, often due to a short to ground, open circuit, or faulty injector. On V12 engines, cylinder 12 is usually the last cylinder on the right bank. This can cause a misfire, reduced power, and increased emissions.
01. Most Common Causes
- Faulty fuel injector on cylinder 12
- Short to ground in injector wiring or connector
- Open circuit in injector wiring or connector
- Damaged PCM or injector driver
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and poor acceleration
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0294 and check for other codes.
Step 2: Visually inspect the injector connector and wiring for damage, corrosion, or loose connections.
Step 3: Measure resistance of cylinder 12 injector; compare to specification (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 connector to PCM to identify open or short.
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 further engine issues.
How much does it cost to fix?▼
Repair costs vary: injector replacement $150-$400, wiring repair $100-$300, PCM replacement $500-$1000.