P0295
UniversalCylinder 12 Injector Circuit High
The engine computer has detected an abnormally high electrical signal in the circuit that controls cylinder 12's fuel injector. The injector meters fuel into that cylinder; an electrical fault can disrupt its operation and cause the engine to run poorly. This code identifies a detected circuit condition, not proof that the injector itself needs replacement. Exact applicability and test procedures depend on the vehicle's model, year, and engine.
⚠️ Before You Begin (Safety First)
If the engine runs very roughly, loses significant power, or the check-engine light is flashing, stop driving when safe and arrange diagnosis; continued driving can worsen engine or exhaust-system damage. If you smell or see fuel leaking, switch off the engine and do not drive the vehicle.
Common Symptoms
- The check-engine light may be on; the vehicle may also have no noticeable symptoms.
- Rough running or a misfire may occur if cylinder 12's injector is not being controlled properly.
- Reduced power or hesitation may result if the affected cylinder contributes less power.
- Fuel economy or exhaust emissions may worsen if the injector circuit fault disrupts fueling.
Common Causes
- Damaged, loose, or corroded wiring or a poor connection in the cylinder 12 injector circuit.
- An open circuit or an unintended connection to voltage that makes the circuit signal read high.
- An injector electrical fault that affects the circuit signal.
- A fault in the engine computer's injector driver or related control circuitry.
Diagnostic Steps
- Check whether the engine is running roughly and whether the check-engine light is flashing. Stop driving if symptoms are severe.
- With the engine off, visually inspect accessible wiring and the cylinder 12 injector connector for damage, looseness, corrosion, or signs of fuel leakage.
- Check for other diagnostic codes and note when symptoms occur; related codes can help guide diagnosis.
- Use model-, year-, and engine-specific service information before disconnecting components or performing electrical tests. Leave circuit measurements and control-module diagnosis to a qualified technician if you lack the required tools or procedure.
When to Call a Professional
A technician can check related codes and scan data, inspect the injector connector and harness, and test the circuit and injector using the vehicle's service information. Comparing the control signal and injector current can help distinguish a wiring fault from an injector or engine-computer driver problem. Do not replace parts based on this code alone.
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Commonly Asked Questions
Does P0295 prove the cylinder 12 injector is faulty?
No. It reports a high electrical signal in the injector circuit. Wiring, connections, the injector, or the engine computer's injector driver may be involved.
Does “circuit high” mean fuel pressure is too high?
No. The code refers to the injector's electrical control circuit, not a direct measurement of fuel pressure.
Can I keep driving with P0295?
If the vehicle runs normally, arrange diagnosis promptly and monitor for changes. Stop when safe if the check-engine light flashes, the engine runs very roughly, power drops substantially, or fuel is leaking.
Why might there be no symptoms?
The fault may be intermittent or may not noticeably affect engine operation under current conditions. A stored code still needs diagnosis.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.