Cylinder 8 Deactivation/Exhaust Valve Control Circuit Open
What does P3416 mean?
The P3416 code means the vehicle's onboard diagnostic system has detected: Cylinder 8 Deactivation/Exhaust Valve Control Circuit Open. This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Vibration during cylinder deactivation mode
- Rough idle
- Exhaust tapping from cylinder 8
- Reduced fuel economy
Probable Causes (Ranked by Likelihood)
- Failed cylinder 8 exhaust deactivation solenoid Very High
- Open circuit in the solenoid wiring High
- Corroded connector Moderate
- ECM driver circuit failure for cylinder 8 Moderate
- Mechanical exhaust lifter failure Low
Step-by-Step Diagnostic Procedure
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Measure cylinder 8 exhaust solenoid resistance
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Inspect wiring for open circuits or damage
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Check connector for corrosion
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Actuate solenoid with a scan tool
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Replace solenoid if failed, inspect lifter if solenoid is functional
Frequently Asked Questions
P3416 is the last cylinder -- does that mean all deactivation solenoids could fail?
While any solenoid can fail, it is more common for one or two to fail rather than all at once. If multiple solenoid codes appear simultaneously, check oil condition and pressure as a common cause.
Are replacement solenoids expensive?
Individual deactivation solenoids are relatively affordable, typically $30 to $80 each. The labor to access them under the valve cover is the main cost factor.
Can I upgrade to non-deactivation lifters?
Yes, AFM delete kits replace the deactivation lifters with standard lifters and include a new camshaft designed for continuous all-cylinder operation.