Haynes lists these early warning signs of transmission fluid trouble: delayed or sluggish gear engagement, shuddering or hesitation between gears, a burnt smell after extended driving, fluid spots under the car and the transmission warning light. It says low or degraded fluid can increase internal wear and lead to costly transmission damage. The first check is the fluid level and condition.
What are the warning signs?
- Delayed or sluggish gear engagement, for example pulling onto a highway on-ramp.
- Shuddering or hesitation when the transmission moves between gears.
- A burnt smell from under the hood after extended driving.
- Fluid spots under the vehicle after it has been parked.
- The transmission warning light.
Haynes says each suggests that the fluid level or condition may need attention. Other faults can cause similar symptoms, so a persistent problem needs a proper diagnosis.
What should you check first?
- Check the fluid level and condition: see how to check transmission fluid.
- Look under the car for leaks.
- Do not ignore the warning light; check your manual and have the car scanned if it stays on.
How can you prevent problems?
Haynes says transmission fluid is not something to deal with only when problems appear, and that clean fluid at the correct level keeps the transmission reliable. Its schedule lists a level check every 3,000 miles or 3 months and a fluid and filter check or change at 30,000 miles or 30 months; see our car maintenance schedule.
What we could not source
We did not find a source we could read on solenoid failures, CVT or dual-clutch problems, repair or replacement costs, or the difference between a flush and a fluid change, so this page does not cover them.
Frequently asked questions
Why is my automatic transmission slipping?
Haynes’ guide lists low or degraded fluid as one possible cause of sluggish or hesitant shifts. A mechanic should diagnose persistent slipping.
Is a burnt smell from the transmission serious?
Haynes lists it as a warning sign that fluid level or condition may need attention. Have it checked.
Sources: Haynes, “How To Check Transmission Fluid Level On A 2019 RAM 1500 Classic” (March 2026); Haynes, “Complete car maintenance schedule” (May 2025).