ASE T8 Truck PM Exam Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q1During a preventive maintenance inspection, a technician notices that the hood latch mechanism requires excessive force to operate. The FIRST action the technician should take is:
✓ Correct answer: D. Clean and lubricate the latch mechanism.
When a hood latch requires excessive force to operate, the technician should first clean and lubricate the mechanism as part of routine maintenance. This often resolves stiffness issues before considering more extensive repairs or adjustments.
Q2When inspecting the truck's instrument cluster, several warning lights remain illuminated after engine start. The MOST likely cause is:
✓ Correct answer: C. Faulty instrument cluster ground connection.
A faulty instrument cluster ground connection can cause multiple warning lights to stay illuminated after startup, as proper grounding is essential for the electrical system to function correctly.
Q3A driver reports that the HVAC system blows only hot air regardless of temperature setting. Technician A says to check the blend door actuator. Technician B says to check the refrigerant level. Who is right?
✓ Correct answer: B. Both A and B
Both technicians are correct. The blend door actuator controls airflow through the heater core and evaporator, while insufficient refrigerant would prevent cooling. Both could cause the system to blow only hot air.
Q4According to FMCSR requirements, which of these windshield conditions would make a commercial vehicle OUT OF SERVICE?
✓ Correct answer: A. A crack that obscures the driver's view in the area swept by the wipers.
FMCSR regulations state that any crack or discoloration that obscures the driver's view in the area swept by the wipers is an out-of-service condition, as it impairs safe operation of the vehicle.
Q5When retrieving diagnostic trouble codes using the dashboard display, the technician must:
✓ Correct answer: D. Turn the ignition to the ON position.
The ignition must be in the ON position (but engine not necessarily running) to power the electronic systems needed to retrieve diagnostic codes through the dashboard display.
Q6Technician A says that hood hinges should be lubricated during every preventive maintenance inspection. Technician B says worn hood guides can cause hood misalignment and potential safety issues. Who is right?
✓ Correct answer: C. B only
Technician B is correct; worn hood guides can cause misalignment issues that could be safety concerns. Hinges require lubrication periodically but not necessarily during every PM inspection.
Q7While inspecting a commercial truck cab, the technician notices a small crack in the passenger side mirror. According to FMCSR regulations, this condition:
✓ Correct answer: B. Requires replacement of the mirror.
FMCSR regulations require all mirrors to be securely mounted and free from cracks that could distort the driver's view. Any crack, regardless of size, requires mirror replacement.
Q8During a cab inspection, which seat belt condition would be cause for immediate replacement?
✓ Correct answer: A. Frayed webbing
Any fraying of seat belt webbing compromises the structural integrity of the restraint system and is cause for immediate replacement, as it could fail in a crash situation.
Q9When checking the operation of the truck's horn during inspection, the technician finds it produces a weak sound. The MOST likely cause is:
✓ Correct answer: D. Loose electrical connection
A loose electrical connection is the most likely cause of a weak horn sound, as it reduces the current flow to the horn, resulting in diminished output.
Q10Technician A says that the windshield washer fluid level should be checked during every preventive maintenance inspection. Technician B says that windshield wiper blades should be replaced only when they fail to clear the windshield effectively. Who is right?
✓ Correct answer: C. A only
Technician A is correct that washer fluid should be checked during every PM inspection. Technician B is incorrect because wiper blades should be replaced based on their condition before they completely fail to function effectively.
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