OBD codes / P0295
P0295
ModerateCylinder 12 Injector Circuit High
An erratic cylinder 12 won't strand you — eleven cylinders will barely notice — but its unburned fuel steadily endangers that bank's catalytic converter. Get the circuit repaired promptly rather than trusting how smooth the engine feels, and stop driving if the light flashes.
What this code means
The final code in the injector-circuit series, P0295 sets when the ECM detects above-expected voltage on the cylinder 12 injector control circuit — possible only on twelve-cylinder engines, where cylinder 12 typically sits at the back of one bank. High-side faults trace to a short to battery voltage in the harness or to added resistance: corroded connector pins, a degraded terminal, or an injector winding that has failed open. This monitor cannot see fuel flow, so the code definitively separates electrical faults from a mechanically clogged injector, which would misfire without tripping it. On a V12 the practical diagnostic advantage is redundancy — eleven identical circuits to compare against — so a resistance check and connector inspection at cylinder 12 usually finds the fault quickly. Related codes are P0212 (cylinder 12 injector circuit) and P0312 (cylinder 12 misfire). As always with V-engines, check the manufacturer's cylinder-numbering diagram, since layouts differ between brands.
Symptoms you might notice
- Cylinder 12 misfire, largely hidden by the remaining cylinders
- Subtle idle unevenness or exhaust-note change
- Slightly diminished power and smoothness
- Check-engine light; flashing indicates the misfire is active
- Intermittent faults may store the code with no drivability complaints
What it costs to fix
Typical range: $60–$450 · about ~0.5–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Fuel injector (single) | $50–$300 | ~0.5–2 hrs |
| Wiring/connector repair | $5–$50 | ~0.5–2 hrs |
Access dominates the bill on twelve-cylinder engines — rear-of-bank injectors under intake plumbing push labor to the top of the range or past it, and direct-injection injectors carry premium prices. A reachable connector repair is the inexpensive outcome.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0295 for my exact vehicle →
Frequently asked
What does P0295 mean compared with P0294?
Both watch the cylinder 12 injector circuit; the split is fault direction. P0295 records high voltage — open circuit, corrosion resistance, or short to battery voltage. P0294 records low voltage — short to ground or a shorted injector coil. The direction guides where diagnosis starts.
Is my injector definitely bad?
Not until it's measured. High-side circuit codes very frequently trace to the connector or harness, and on a twelve-cylinder engine a connector cleaning is dramatically cheaper than injector access. Resistance-test the injector first; replace only if it reads open or clearly out of spec.
The code sets only on hot days. Why?
Heat expands metal and softens insulation, so a marginal connector pin or chafed wire can fault only under certain temperatures — classic intermittent-circuit behavior. That pattern points to the wiring side, and wiggle-testing the warm harness while monitoring the circuit often locates it.
Can I drive with P0295 in the meantime?
Short and gentle, yes, if the light is steady. The threat isn't breakdown but slow catalyst damage from unburned fuel — and replacing a V12's exhaust hardware costs far more than this repair. If the check-engine light flashes, stop driving and have it seen.
Seeing P0295 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0295 for my vehicleRelated trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0295 from your phone — see our honest guide to the best OBD2 Bluetooth adapters.
Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.