# Used Truck Inspection Checklist

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Last modified: 2026-05-29T19:39:17+00:00
Type: efin_guide

## Summary

Used Truck Inspection Checklist. Comprehensive guide.

## Content

Buying a used Class 8 truck or commercial vehicle that you plan to finance? A pre-purchase inspection from a qualified mechanic is the single best protection against expensive surprises. Here is what to check and what to document.

Engine and powertrain

Engine oil sample analysis (look for metal particles, glycol contamination, fuel dilution)
Compression test on each cylinder
Turbo and exhaust manifold inspection (leaks, cracks)
Cooling system (radiator, hoses, water pump, EGR cooler condition)
Aftertreatment system: DPF (Diesel Particulate Filter) condition, SCR/DEF system, NOx sensors, regen history
Transmission: shift quality, fluid condition, prior rebuild history
Differential: oil sample, gear noise, prior rebuild
Drive shafts and U-joints


Frame and chassis

Frame rail inspection for cracks (especially near saddle area, fifth wheel mount, suspension mount)
Cross-member condition
Suspension components: airbags, leaf springs, shocks, bushings
Air system: leaks, dryer condition, governor cut-in pressure
Steering: gearbox, drag link, tie rod ends, kingpin play
Fifth wheel: top plate, locking jaw, height, pivot


Brakes

Foundation brakes: shoe and drum thickness on each wheel position
Air system: pressure tests, leak-down test, slack adjuster operation
ABS warning lamp and function
Brake balance under loaded condition (if test-drivable)


Tires and wheels

Tire depth on each position (steer minimum 4/32", drive/trailer minimum 2/32" DOT)
Sidewall condition (cracking, bulging)
DOT date code (avoid tires over 6 years old regardless of tread)
Wheel and rim condition (cracks, bent flanges)
Spare and tools


Electrical and HVAC

Battery condition and charging system test
Starter draw test
All lighting (DOT-required + cab interior)
Heater, AC, defroster operation
Dashboard gauges and warning indicators
ECM data: total miles, hours, fault history (request OEM diagnostic pull)


Cab and interior

Door seals and hinges
Window operation
Driver seat condition (airbag suspension on premium trucks)
Sleeper condition (if applicable): mattress, AC, refrigerator, inverter
Wiper operation and washer fluid


Documentation to request from seller

Maintenance records (full service history, ideally from OEM dealer)
Carfax / VIN history report
ECM mileage history pull
Prior DOT inspection records
Title with clear lien status (no active UCC or DMV liens)
Any warranty remaining (transferable extended warranty is gold)


What to budget for inspection
Qualified Class 8 truck inspector: $250-500. Mobile inspection (they come to you or the seller): $400-800. Pre-purchase inspection by an OEM dealer (Freightliner, Kenworth, Peterbilt, Mack, Volvo): $300-600.

Red flags that warrant walking away

Frame cracks anywhere
DPF aftermarket "delete" (illegal; will fail emissions inspection)
Coolant in oil or oil in coolant (head gasket or EGR cooler issue)
Major recent paint work hiding rust or accident damage
Maintenance records gaps over 6 months
Title issues (salvage, branded, prior repo on a recent title)
Excessive ECM fault codes with active warning lights


What lenders require
For used trucks financed over $25,000, most lenders require a third-party inspection report. The lender may have an approved inspector list or you can use any qualified mechanic. The report goes into the underwriting file along with the equipment quote and bank statements.

Apply for used-truck financing at /apply/.