TransmissionCritical
Radiator internal failure mixing coolant into the transmission ('milkshake').
- Typically appears
- Age-related
- What to inspect
- Check transmission fluid for a pink, milky look; ask about radiator/bypass fix.
2005–2019 Nissan Frontier — common problems & known faults
The long-running D40 Frontier is tough, but the radiator-to-transmission cross-contamination fault is the critical check.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Known faults to check
EngineMedium
Timing chain tensioner rattle on the VQ40.
- Typically appears
- 120,000+ miles
- What to inspect
- Listen for rattle on cold start.
ExhaustLow
Exhaust manifold / stud failure with a tick.
- Typically appears
- 100,000+ miles
- What to inspect
- Listen for a tick that fades when warm.
BodyMedium
Bed and frame corrosion in salt regions.
- Typically appears
- Age-related
- What to inspect
- Inspect the frame and bed for rust.
Inspecting a Nissan Frontier?
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Generate a free checklistFrequently asked questions
Is the Frontier reliable?
Very tough mechanically; the radiator cross-contamination fault is the main watch-out.
What is the milkshake problem?
A failed radiator lets coolant into the transmission, wrecking it — check the fluid.
Should I bypass the transmission cooler?
Many owners fit an external cooler and bypass the radiator loop preventatively.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.