P0268: Cylinder 3 Injector Circuit High
Can you still drive? Not recommended. Excess fuel can foul the spark plug, damage the catalytic converter, and dilute engine oil.
What Does P0268 Mean?
Code P0268 indicates the ECM has detected an abnormally high voltage in the cylinder 3 fuel injector circuit. This suggests a short to power in the wiring or an internally failed injector. The injector may be stuck open, causing excessive fuel delivery to cylinder 3.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Shorted injector wiring to battery voltage
- Internally failed fuel injector
- Chafed wiring harness
- ECM injector driver malfunction
Symptoms
- Check engine light on
- Rough idle
- Black smoke from exhaust
- Fuel odor
- Engine misfire on cylinder 3
Diagnostic Steps
- 1Inspect cylinder 3 injector wiring for shorts or damage
- 2Measure injector connector voltage with engine off
- 3Test injector coil resistance against specifications
- 4Disconnect injector and recheck circuit voltage
- 5Inspect wiring harness routing for contact with metal edges
Recommended Parts & Tools
fuel injector
wiring harness repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $600 |
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Chat with AI About P0268Commonly Affected Vehicles
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Frequently Asked Questions
Can a high injector circuit cause hydro-lock?
In extreme cases, yes. If the injector is stuck wide open, liquid fuel can fill the cylinder and cause hydro-lock, which can bend connecting rods.
Should I replace the wiring or the injector?
Diagnose first. If the injector resistance is out of spec, replace the injector. If the wiring is shorted, repair the harness.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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