Cylinder Deactivation System (Bank 2)
What does P3417 mean?
The P3417 code means the vehicle's onboard diagnostic system has detected: Cylinder Deactivation System (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Vibration at highway speeds
- Rough idle during deactivation
- Engine noise changes at cruise
- Decreased fuel economy
Probable Causes (Ranked by Likelihood)
- Failed deactivation solenoid on Bank 2 Very High
- Low or dirty engine oil affecting Bank 2 solenoids High
- Clogged oil passages to Bank 2 deactivation lifters Moderate
- Failed deactivation lifter on Bank 2 Moderate
- ECM control circuit fault for Bank 2 deactivation Low
Step-by-Step Diagnostic Procedure
-
Check engine oil level and condition
-
Monitor Bank 2 deactivation solenoid operation with a scan tool
-
Test individual Bank 2 solenoids electrically
-
Check oil pressure at the Bank 2 solenoid gallery
-
Inspect deactivation lifters if solenoids test good
Frequently Asked Questions
What is the difference between P3400 and P3417?
P3400 is the general deactivation system code for Bank 1, while P3417 covers the same system on Bank 2. The diagnostic approach is identical but focused on the opposite cylinder bank.
Can both banks have deactivation issues at the same time?
Yes, if the root cause is shared, such as low oil level or poor oil quality, both banks can be affected simultaneously.
Should I change the oil before diagnosing?
If the oil is overdue for a change, starting with fresh oil of the correct specification is a good first step. Some deactivation codes clear after an oil change when dirty oil was the root cause.