Chevrolet Tahoe

LM2 3.0L Duramax I6 Diesel 277 hp Automatic SUV 2021–2025

– Be Careful

Engine LM2 – Be Careful 6,300–22,000 $

3.0L Duramax inline-6 diesel — the only I6 diesel in a US pickup. LM2 (2020-2022) had early issues: crankshaft reluctor wheel, rear main seal, DEF system. From 2023 completely revised (LZ0, steel pistons replacing aluminum). Buyers: avoid LM2 or inspect carefully, prefer LZ0.

Fun Factor? Decent

Tahoe 3.0 Duramax — highway diesel in an SUV

277 hp inline-6 diesel: the most economical Tahoe option. LM2 (2021-2022) with early issues, LZ0 (2023+) significantly better. Ideal for high-mileage drivers.

Engine Weaknesses 3

!! Engine Cranks Without Starting (LM2 2020-2022)

Crankshaft reluctor wheel fails — engine cranks without starting. Repair requires cab removal (40h labor).

Symptoms: Engine cranks without starting, especially cold, intermittent

3,000–8,000 $ from 30,000 km

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!! Rear Main Seal Leak

Seal leaks on early LM2 (2020-2022). Oil spots under the vehicle.

Symptoms: Oil spots under vehicle, dropping oil level

800–2,500 $ from 50,000 km

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!! DEF System Failure

"Service DEF System" warning, limp mode, no-start in extreme cases. Injector, sensor or pump defective.

Symptoms: Service DEF warning, power reduction, limp mode

500–3,000 $ from 60,000 km

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Vehicle Weaknesses 1

!! Gearbox 10-Speed Shudder

Same 10L80 issue as Silverado T1XX. Recall 26V085.

2,000–8,500 $ from 50,000 km

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