P17F4: CVT Judder (Auxiliary Gearbox) (Nissan)
Severity: medium
What it means: Nissan's transmission computer has detected judder in the CVT's auxiliary gearbox clutch. Nissan labels it 'Auxiliary gearbox (CL judder)'. It doesn't turn on the check-engine light.
Safe to drive? Usually drivable short term, but the vibration can get worse. Get it checked.
Common symptoms
- Vibration when accelerating again quickly after braking
- Judder or shudder at low speed
- No check-engine light
Likely causes, ranked
- Auxiliary gearbox clutch judder inside the CVTShop
- Transmission computer softwareShop
- CVT fluid conditionShop
Vehicle-specific notes
- 2018–2019 Nissan Versa: Nissan's enhanced CVT diagnostic logic adds P17F0–P17F4, which don't turn on the check-engine light. A 2026 Nissan bulletin covers P17F4 on 2020–2022 Versa and 2018–2022 Kicks. Read the full answer · Source
What it means: Nissan's transmission computer has detected judder in the CVT's auxiliary gearbox clutch. Nissan labels it 'Auxiliary gearbox (CL judder)'. It doesn't turn on the check-engine light.
Severity: Medium. Safe to drive? Usually drivable short term, but the vibration can get worse. Get it checked.
DIY or shop?
Dealer. The fix follows Nissan bulletin steps.
Before you replace parts
- Ask the dealer to read transmission codes. This one won't show on a basic code reader that only reads engine codes.
- Check your VIN for Nissan CVT bulletins and software updates.
- Ask about extended CVT coverage on your VIN.
- Ask for the bulletin's inspection steps before agreeing to a full transmission.
Safety / mechanic note
Verify with a mechanic. Judder when pulling out can leave you short of power in traffic. A code points to a circuit or system, not always a specific part.