Cylinder 4 Deactivation/Intake Valve Control Circuit Open
What does P3404 mean?
The P3404 code means the vehicle's onboard diagnostic system has detected: Cylinder 4 Deactivation/Intake Valve Control Circuit Open. This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough idle during cylinder deactivation
- Engine vibration
- Ticking from cylinder 4 area
- Poor fuel economy
Probable Causes (Ranked by Likelihood)
- Failed cylinder 4 deactivation solenoid Very High
- Open circuit in cylinder 4 solenoid wiring High
- Corroded solenoid connector Moderate
- ECM driver fault for cylinder 4 Moderate
- Low oil pressure to the solenoid Low
Step-by-Step Diagnostic Procedure
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Test cylinder 4 deactivation solenoid resistance
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Inspect wiring and connector for opens or corrosion
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Verify power and ground at the connector
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Check engine oil level and condition
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Replace solenoid if internal coil has failed
Frequently Asked Questions
Which cylinders use deactivation?
On GM V8 engines with AFM, cylinders 1, 4, 6, and 7 are typically deactivated. On Chrysler V8 MDS engines, cylinders 1, 4, 6, and 7 or 2, 3, 5, and 8 may be deactivated depending on the design.
Can I tell which cylinder is affected without a scan tool?
It is difficult to identify the specific cylinder without a scan tool. The code number directly corresponds to the cylinder number with the fault.
Will a failed solenoid cause a misfire code?
It can. If the solenoid fails to properly control the valve, the affected cylinder may not fire correctly, which can trigger a misfire code like P0304 for cylinder 4.