The 2020 Infiniti QX60's continuously variable transmission (CVT) offers smooth acceleration when functioning properly—but when shudder develops at low speeds and P0700 appears, that smoothness becomes vibration. Understanding the CVT's operation helps interpret these symptoms and approach diagnosis correctly.
Understanding P0700
P0700 is a generic transmission fault indicator—it signals the transmission control module has detected an issue and stored more specific codes. Always scan for additional transmission codes to find the actual diagnostic direction.
CVT Shudder Characteristics
- Vibration or shuddering during light acceleration from stops
- Judder during low-speed coasting
- Feeling like driving over rumble strips on smooth pavement
- Often worse when transmission is cold
- May improve slightly as transmission warms
Primary Causes
CVT Fluid Degradation
CVT fluid is highly specialized—it must provide correct friction characteristics for the belt and pulley system. Degraded fluid loses these properties, causing the belt to slip and grab alternately, creating shudder.
Belt Wear
The steel belt transferring power between variable pulleys can wear or develop damage that creates inconsistent friction and vibration.
Pulley Wear
The variable pulleys that change ratios can develop wear patterns affecting belt grip and smooth operation.
Torque Converter Issues
The CVT still uses a torque converter for initial engagement. Lockup clutch shudder from this component mimics internal CVT problems.
Valve Body Problems
Hydraulic control issues affect pulley clamping pressure, causing belt slip and shudder.
Repair Costs
| Repair | Parts | Labor | Total |
|---|---|---|---|
| CVT fluid exchange | $150-$250 | $150-$250 | $300-$500 |
| Torque converter replacement | $400-$700 | $800-$1,200 | $1,200-$1,900 |
| CVT rebuild | $1,500-$2,500 | $1,500-$2,500 | $3,000-$5,000 |
| CVT replacement (new/reman) | $3,500-$6,000 | $1,500-$2,500 | $5,000-$8,500 |
Important Note on CVT Fluid
CVT fluid is NOT interchangeable with regular automatic transmission fluid. Using incorrect fluid causes immediate damage. Only Nissan NS-2 or NS-3 CVT fluid (or approved equivalent) should be used.