Cadillac Escalade T1XX

3.0L inline-six diesel with aluminum block and single VGT turbo — the only I6 diesel in a US half-ton. Quiet, torque-rich and economical: 22-26 mpg unloaded on the highway. The early run (2020-2022) had several unusual design flaws: a factory-bent camshaft reluctor wheel caused crank-no-start (DTC P0341), and the first-generation timing chain stretched from poor lubrication at the rear of the block. The oil pump is driven by a wet belt running in oil that comes due at 95,000-150,000 miles — and the transmission has to come out to replace it. For 2022 GM revised the chain and reluctor, and for 2023 the LZ0 with steel pistons and a stronger turbo resolved most issues. Solid once the early-build gremlins are sorted — documented service history and a confirmed reluctor/chain status are key when buying.

• !! Crank-no-start: bent reluctor wheel (2020-2022) from 20,000 km

  Factory-bent camshaft reluctor wheel: if the engine stops in exactly the wrong position it cranks without firing (DTC P0341). Replacing the trigger wheel requires cab/transmission removal (40+ hours); a calibration is often tried first.

  Symptoms: Engine cranks 10-20 seconds or won't start at all, usually intermittent; check-engine light with DTC P0341. Often appears soon after purchase.
  0–6,000 $
  Ad camshaft reluctor wheel LM2 3.0 Duramaxcamshaft trigger wheel 3.0 Duramaxcalibration PIP5823B no start
• !! Timing chain stretch, early build (2020-2021) from 100,000 km

  The first-gen chain stretches from poor lubrication at the rear of the block — a camshaft cover let oil bypass the PCV system. Measured at 5.8 mm of slack across 52 links. Throws off valve timing, in extreme cases engine failure (~$10,000). GM revised it for 2021/2022.

  Symptoms: Rattle at the rear of the engine, power loss, timing-correlation fault codes; metal debris in the oil in advanced stages.
  3,000–9,000 $
  Ad timing chain 3.0 Duramax LM2revised timing chain kit 3.0 Duramaxcamshaft cover 3.0 Duramax PCV
• !! Rear Main Seal Leak from 50,000 km

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

  Symptoms: Oil spots under vehicle, dropping oil level
  800–2,500 $
  Ad 40009072 GM rear main seal 3.0 Duramax LM255506777 GM rear main seal LM2

+ 4 more engine weaknesses + vehicle weaknesses

6.2L V8 EcoTec3, 420 hp, same Gen V architecture as the 5.3 but with a deeper exhaust note and noticeably more shove. On the 2021–2024 build years the manufacturing process left metal debris and out-of-spec connecting-rod/crankshaft parts in roughly 600,000 engines — bearing failure without warning, in the worst case loss of propulsion while driving. GM's recall fix was a switch to 0W-40 oil, which doesn't address the root cause; NHTSA is investigating continued failures, including the excluded 2019–2020 trucks. Add the same DFM lifter risk as the 5.3 plus oil consumption. Pre-2021 examples or confirmed post-recall engines with a complete oil-change history are the ones to buy.

• !! Recall: rod-bearing / crankshaft defect — approx. 600,000 vehicles

  Manufacturing faults in the connecting rods and crankshaft (out of spec, machining debris in the oil galleries) destroy the bearings — engine failure without warning, in extreme cases loss of propulsion while driving. Affects 2021–2024 L87. GM fix: free inspection, engine replacement if needed, otherwise a switch to 0W-40 oil. NHTSA is investigating continued failures.

  Symptoms: Knocking/tapping, sudden loss of power or propulsion, oil-pressure warning, metal particles in the oil, in extreme cases a stall while driving.
  0–0 $
  Ad L87 rod bearing set 6.2crankshaft 6.2 V8 L87replacement engine 6.2 L87Mobil 1 FS 0W-40
• !! AFM/DFM lifter failure from 100,000 km

  Same lifter issue as the 5.3L: the cylinder-deactivation lifters collapse or stick, a pushrod bends, metal debris enters the oil. Also affects the 2019–2020 trucks excluded from the rod-bearing recall — cam/lifter damage there as early as 55,000 km, clustering around 145,000 km.

  Symptoms: Ticking/knocking from the valvetrain, misfires, power loss, check-engine light, rough running, in extreme cases engine failure.
  2,500–8,500 $
  Ad AFM DFM lifter set 6.2 V8 L87cylinder deactivation lifter 6.2DFM delete kit L87camshaft 6.2 EcoTec3
• !! Oil Consumption — Piston Rings (2019-2020 and older L87) from 120,000 km

  Piston rings and AFM oil nozzles pass oil — 0.5–1 litre per 3,000 km in bad cases. Especially affects the 2019–2020 L87 not covered by the rod-bearing recall. NHTSA is investigating these earlier years in a separate probe.

  Symptoms: Falling oil level between changes, blue smoke, oil-fouled plugs, oil-pressure light, in extreme cases knocking from oil starvation.
  2,500–7,000 $
  Ad piston rings GM 5.3 L84oil consumption fix Silverado

+ 1 more engine weaknesses + vehicle weaknesses

6.2-liter V8 with an Eaton TVS2300 1.7-liter supercharger, direct injection and variable valve timing — the final evolution of the small-block architecture. 650 hp at 6,400, 650 lb-ft at 3,600, boost from as low as 1,800 rpm and a wall of thrust from 3,500. Brutally effortless on the road. The catch only shows up on track: the air-to-water intercooler saturates after a few laps, charge-air temperature climbs, the ECU pulls timing and in the worst case drops into limp mode — exactly the behaviour the identical high-output variant in the Corvette is notorious for. If you plan to track it, budget for a larger heat exchanger and an extra cooling package. Mechanically the supercharger coupler is the weak point, isolated failures before 80,000 km. AFM affects only the automatic; the manual runs permanently on eight cylinders. Add DI carbon buildup on the intake valves and intercooler seals that age over time. Care: synthetic oil, keep an eye on oil temperature, catch can. The last factory-supercharged Camaro engine — sought after accordingly.

• !! AFM hydraulic lifter collapse (supercharged V8) from 70,000 km

  The blown V8 carries the AFM hardware too — only the automatic deactivates cylinders and can collapse a lifter. The manual runs all eight cylinders permanently and is far safer. A range disabler removes the risk.

  Symptoms: Ticking/knocking from the valve cover, misfires (P0300), rough running, power loss — almost only on automatics.
  3,000–7,000 $
  Ad LT4 AFM lifter ZL1
• !! Intercooler heat soak / power pull on track

  The air-to-water intercooler saturates after a few laps, charge-air temps climb and the ECU pulls timing — in the worst case dropping into 'Reduced Engine Power' limp mode. Same behaviour as the notorious C7 Z06. A larger heat exchanger cures it.

  Symptoms: Noticeable power loss after a few fast laps, 'Reduced Engine Power' message, rising intake air temperature.
  600–2,500 $
  Ad intercooler LT4 ZL1 Camaro
• !! Supercharger coupler/bearing noise from 60,000 km

  The Eaton blower can wear at the coupler and develop a rattle or metallic whine, some cases before 80,000 km and more common on track-driven cars. Comes with loss of boost and power. Fixed by replacing or rebuilding the supercharger unit.

  Symptoms: Rattle or metallic whine from the blower area, loss of boost, power drop — worse after track use.
  1,500–4,000 $
  Ad Eaton TVS2300 bearing LT4supercharger ZL1 6th gen

+ 2 more engine weaknesses + vehicle weaknesses