Buyer's checklist · 6.2 Boss (gas)
Used 6.2 Boss (gas): what to check before you buy
The 6 documented failures of this engine, laid out in the order you inspect a truck: paperwork and VIN, a cold start, a code scan, under the hood, the test drive and a look after it. Each line is the sign as our record describes it, linked to the full failure page. At the end: what each repair costs.
1Before you go
Run the VIN and ask for the paperwork on the campaigns below: a done recall or program is a solved problem, an open one is a free repair the seller has not had done.
- Run the VIN
It confirms the engine and lists the campaigns for that model year. Whether a recall is still open on this VIN: nhtsa.gov/recalls.
- Safety recalls on this engine
2Cold start and idle
Ask the seller not to start or warm the engine before you arrive. Most of these only show on a cold engine; then let it idle and listen.
- Exhaust manifold leaks (broken manifold bolts)2011-2019
- ticking at cold start that quiets as metal warms
- Fuel delivery service (in-tank pump / PFI injectors)
- long crank / low rail pressure complaints on high-mileage trucks
- Ignition service wear (16 plugs / coils)
- rough idle / misfire as plugs age - doubled service surface (16 plugs per engine)
4Hood up and underneath
Engine off, in daylight, with a flashlight.
- Cooling service (water pump / thermostat / degas)
- weep-hole seepage / bearing noise at higher mileage
- temperature swings under tow; degas level drift
To confirm: pressure-test the system; inspect the weep hole and bearing play
- Oil consumption (owner reports)
- oil level drift between services without visible leaks
To confirm: rule out external leaks first; verify PCV function
6After the drive
Hot engine, parked: the dipstick and the coolant reservoir tell you what the drive did. Then shut it off and restart it hot: some failures only show on a hot restart.
- Exhaust valve seat wear (early builds)
- progressive rough idle and misfires that worsen when hot
To confirm: compression / leak-down test per cylinder, hot and cold
What it costs if you find it
Parts budgets from our repair recipes for this engine: Dave's Auto Center's prices where Dave's lists the part, approximate OEM and maker catalog prices (rounded) for the rest; labor not included. A campaign listed next to a failure may make the repair free on a covered truck: check it by VIN.
Everything on the 6.2 Boss (gas)Symptoms on this engineRecalls and bulletins
Built from the failure-mode records, recalls registry and repair recipes on this site; every line links to its source page with tiers and sources. This is a list of documented failures to check, not an inspection: a pre-purchase inspection by a diesel shop sees what we cannot. Years show where a failure covers only part of the engine's run. How we tier and source facts.