18/06/2026 8:38 am
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Automotive Q&A
2016 Altima CVT judder near 25 mph: engine misfire or lockup behavior?
Review the evidence, add a focused answer, and distinguish confirmed measurements from assumptions.
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A light shudder occurs between 22 and 28 mph under gentle throttle. Engine misfire counters stay at zero and the vibration stops immediately when converter lockup command releases. Primary and secondary pulley ratios remain steady, and no CVT code is stored. Fluid level is correct but service history is unknown.
Which data and fluid checks should be captured before recommending transmission work?
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19/06/2026 7:37 am
Graph engine torque, lockup command, lockup slip, input and output speed, and ratio through a repeatable route. Confirm the symptom follows lockup rather than a particular engine load or wheel speed. Inspect fluid condition and verify it is the exact specified type; do not judge condition only by color. Review applicable calibration and service information for the VIN.
A controlled lockup release that immediately removes the shudder is useful evidence, but pressure tests or adaptation data may still be required before deciding between fluid service, valve-body control and internal converter wear.
Topic starter
20/06/2026 7:11 am
The slip trace oscillated with the vibration only during partial lockup. The installed fluid failed the specification check and service history showed a universal fluid top-up. After the approved exchange and adaptation procedure, slip stabilized and the route was smooth.