P0294
Cylinder 12 Injector A Circuit Low
Fuel injection
Generic OBD-II
High
What it means
P0294 means the ECM detects a low-voltage (short-to-ground or open) condition in the electrical circuit for cylinder 12's fuel injector. This is a wiring/injector fault, not a fuel-pressure problem — when the injector can't switch properly, cylinder 12 misfires and the engine runs rough. Persistent misfiring risks catalytic-converter damage, so trace the circuit and injector promptly.
High
Can I keep driving? Driveable but rough — if cylinder 12's injector isn't firing you'll get a misfire, and sustained misfiring can damage the catalytic converter.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle or misfire
- Reduced power and hesitation
- Possible increased fuel consumption
Common causes
Most likely first
- Short-to-ground or open in the cylinder-12 injector circuitLikely
- Failed cylinder-12 fuel injector (open or shorted coil)Common
- Corroded or loose injector connectorCommon
- Chafed or damaged injector harness wiringLess often
- Faulty injector driver in the ECM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the cylinder-12 injector connector and wiring for a short to ground or open.
- Measure the injector coil resistance and compare to spec and the other injectors.
- Check for battery voltage and a switching ground at the connector with the key on.
- Replace the injector if the coil is open or shorted.
- Repair the harness or connector if the injector tests good. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0294?+
Only briefly. A dead injector means cylinder 12 misfires, dumping raw fuel that can overheat and destroy the catalytic converter. Fix it soon.
Can I just clear P0294?+
It returns immediately if the injector circuit is still faulty. The wiring or injector must be repaired first.
Related codes
Often seen with P0294
Read & clear P0294 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX