OBD2 Code P0278: Fuel Injector Circuit – Malfunction
Electrical anomaly injector circuit.
Detected Root Component
Injector
Technical Component Diagrams
Injector Layout
Diag Expert technical diagram
Injector Connector
Diag Expert technical diagram
Observed Symptoms
- Engine light on (MIL/Check Engine)
- Rough or unstable slow motion
- Abnormal engine vibrations
- Hesitation when accelerating
Possible Causes
- Clogged or faulty injector
- Damaged wiring
- Corroded connector
- Short circuit in harness
Tools Required
Interactive Diagnostic
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Diagnostic Result
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Parts likely to be the cause (Injecteur)
Injecteur
Photo d'illustration : Injecteur
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Frequently asked questions about code P0278
What does code P0278 mean? ▾
OBD2 Code P0278: Fuel Injector Circuit – Malfunction. Electrical anomaly injector circuit.
What are the symptoms of code P0278? ▾
Code P0278 may cause: Engine light on (MIL/Check Engine), Rough or unstable slow motion, Abnormal engine vibrations, Hesitation when accelerating. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0278? ▾
The most common causes of code P0278 are: Clogged or faulty injector, Damaged wiring, Corroded connector, Short circuit in harness. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0278? ▾
Code P0278 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code P0278? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Clogged or faulty injector, Damaged wiring, Corroded connector, Short circuit in harness. Difficulty: Medium · Estimated time: 60-90min.