Wiring fault on the cylinder 12 injector circuit, such as a short to voltage or chafed insulation; Corroded, loose or damaged injector connector or control unit connector pins; Faulty cylinder 12 injector with internal short or incorrect coil resistance; Shared power supply or relay fault affecting the injector circuit; Fault in the injector driver stage inside the engine control unit; Outdated or faulty control unit software, where the manufacturer has issued a known update for this fault.

P0295

Cylinder 12 Injector A Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
95: FaultThe specific fault in that area

What it means

P0295 is the generic code for a high signal in the injector circuit for cylinder 12, which means the control unit has seen a voltage or current state on that circuit that is higher than expected. It is set by the engine control unit's driver monitoring of the injector circuit, and it only applies to engines with at least twelve cylinders. The exact circuit layout and wording of the fault vary by manufacturer and engine.

Symptoms

Engine misfire or rough running, especially at idle
Malfunction indicator lamp on
Loss of power or poor acceleration
Cylinder 12 not firing or running lean or rich
Increased fuel consumption or fuel smell
Engine may enter limp mode or run on reduced cylinders

Possible causes

Wiring fault on the cylinder 12 injector circuit, such as a short to voltage or chafed insulationlikely
Corroded, loose or damaged injector connector or control unit connector pinslikely
Faulty cylinder 12 injector with internal short or incorrect coil resistancelikely
Shared power supply or relay fault affecting the injector circuitpossible
Fault in the injector driver stage inside the engine control unitrare
Outdated or faulty control unit software, where the manufacturer has issued a known update for this faultrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting engine speed, load, temperature and whether other injector codes are present.
Confirm which bank and position is cylinder 12 for this engine, as cylinder numbering varies by model.
Visually inspect the injector connector and the wiring loom to cylinder 12 for chafing, heat damage, oil contamination, corrosion and bent or pushed-back pins.
Check live data or misfire counters to see whether cylinder 12 is misfiring and whether the fault is constant or intermittent.
Measure the injector coil resistance and compare it with the manufacturer's specification for the engine.
With the connector unplugged, test the circuit for a short to voltage and check the supply and earth, following the wiring diagram for the model.
Swap the injector with a known good one from another cylinder, if the design allows, and see whether the fault follows it.
Check for a relevant software update or technical bulletin for the engine before condemning the control unit.

How to fix

Repair or replace damaged wiring on the cylinder 12 injector circuit, using proper soldered and sealed repairs or a new section of loom.
Clean, repair or replace corroded or damaged connectors and terminals.
Replace the cylinder 12 injector if its resistance or operation is out of specification, and carry out any required coding or adaptation for the engine.
Repair the shared power supply, fuse or relay fault if it is feeding the injector circuit.
Update the control unit software if a known fault is documented, or repair or replace the control unit only after the wiring and injector have been proven good.

Can I keep driving?

Medium severity

The car can be driven gently for a short time to get it to a workshop, but it should be fixed soon. A misfiring cylinder can send unburnt fuel into the exhaust and damage the catalytic converter, so avoid heavy loads and stop if the engine runs badly or the warning lamp flashes.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.