ASE G1 Auto Maintenance and Light RepairAutomatic Transmission/TransaxleHard
A customer complains that their vehicle with an automatic transmission hesitates and slips when shifting from first to second gear, especially when cold. The fluid level is correct, and the fluid appears clean and reddish-brown. What is the most likely cause of this symptom?
- AA clogged transmission fluid filter.
- BA faulty torque converter.
- CWorn clutch packs or band.
- DAn incorrectly adjusted throttle position sensor (TPS).
Show answer & explanationAnswer & explanation
Correct answer: C. Worn clutch packs or band.
Hesitation and slipping, particularly between specific gears and especially when cold, are classic symptoms of internal friction component wear, such as worn clutch packs or bands. These components lose their ability to grip effectively, leading to slippage during gear changes.
Why the other options are wrong
- A. A clogged filter usually leads to overall low pressure and delayed engagement or no engagement, not typically specific gear slipping.
- B. A faulty torque converter typically causes issues like shuddering, poor acceleration, or locking/unlocking problems, not specific gear-to-gear slipping.
- D. An incorrectly adjusted TPS can affect shift points and harshness but is less likely to cause distinct slipping between specific gears without other symptoms.
Transmission Slipping
Transmission slipping occurs when the engine RPM increases without a corresponding increase in vehicle speed, indicating a loss of power transfer within the transmission.
- Often worse when cold or under load.
- Can be caused by low fluid, worn internal components, or hydraulic issues.
- Requires prompt diagnosis to prevent further damage.
Memory trick: Fluid, Friction, or Faulty Valve Body, can make your transmission slip and slide, oh my!