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GMC · Pickup Truck · 2019–2025

GMC Sierra 1500 T1XX

Weaknesses, engine ratings and buying advice

★★★★★
3.0 / 5.0 · Based on 4 engine variants
Most Fun Engine

426 PS

6.2L V8 EcoTec3 Benzin

6.2 Denali T1XX — peak GM truck, recall shadow

Fun to Drive!
Most Reliable Engine

314 PS

2.7L Turbo I4 Benzin

5 weaknesses

Good Choice
Problem Engine

360 PS

5.3L V8 EcoTec3 Benzin

3 weaknesses

Stay Away!

Generations

Engine Overview

The GMC Sierra 1500 T1XX is available with 2 engine variants — from 282 to 426 hp. 1 variants had engine changes — the model year is crucial.

Sierra 1500 · Diesel· 277 PS
2020 2025
Be Careful 3 weaknesses
Show all weaknesses →
Sierra 1500 · Petrol· 310–420 PS Engine Change
2019 2025
Stay Away! 3 weaknesses
Show all weaknesses →
2019 2025
Be Careful 4 weaknesses
Show all weaknesses →
2019 2025
Good Choice 5 weaknesses
Show all weaknesses →

The GMC Sierra 1500 (Diesel, 277 PS) has the LM2 (3.0L Duramax I6) — rated: "Be Careful", 3 known weaknesses.

The GMC Sierra 1500 (Petrol, 310–420 PS) comes with 3 different engines: L84 (2019–2025, Stay Away!) und L87 (2019–2025, Be Careful) und L3B (2019–2025, Good Choice). Pay attention to the model year for the Sierra 1500!

Vehicle Weaknesses

WeaknessCost
!10L80 10-Speed Transmission Shudder — Class Action

10L80 transmission develops harsh shifts and shudder. Multiple class actions filed. GM fluid flush (Mobil 1 LV ATF HP) helps temporarily. Severe cases require torque converter or complete transmission replacement under warranty extension.

Symptoms: Harsh 1-2 and 3-4 shifts, shudder at low speed, hesitation on acceleration, clunking into reverse
from 40,000 km
Ad 24291289 ACDelco 10L80 filterMobil 1 LV ATF HP 10L80torque converter 10L80 Sierra
 High
NHTSA Owner Complaints
Below average
2,400 complaints · 2019–2025
Engine
700 ⚠ 10
Powertrain
380 ⚠ 12
Brakes
280 ⚠ 18
Electrical
220 ⚠ 5
Body/Paint
180

Top Reported Issues

⚠ Engine (700 complaints)
⚠ Powertrain (380 complaints)
⚠ Brakes (280 complaints)
Source: NHTSA (nhtsa.gov) · 2026-04

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Known Problems and Issues

A total of 21 weaknesses have been documented for the GMC Sierra 1500 T1XX (2019–2025) — 15 engine-related and 6 vehicle-related. One problem engine: L84 (5.3L V8 EcoTec3). Typical issues affect Gearbox, Electronics, Rust, Body. Considered reliable: L3B (2.7L Turbo I4).

Sierra 1500 (LM2, 2020–2025) — Be Careful: Engine Cranks Without Starting (LM2 2020-2022), Rear Main Seal Leak, DEF System Failure. Power: 277 PS.

Sierra 1500 (L84, 2019–2025) — Stay Away!: AFM/DFM Lifter Failure — Class Action, Oil Consumption — Piston Rings (Class Action), Timing Chain Wear. Power: 355 PS.

Sierra 1500 (L87, 2019–2025) — Be Careful: Recall: Metal Shavings in Engine — 597,000 Vehicles, AFM/DFM Lifter Failure, Oil Consumption — Piston Rings (2019-2020 and older L87). Power: 420 PS.

What to watch out for with the GMC Sierra 1500? See the detailed listing of all engine and vehicle weaknesses in the sections above.

Frequently Asked Questions

What problems and weaknesses does the GMC Sierra 1500 T1XX have? +
The GMC Sierra 1500 T1XX has 15 known engine weaknesses and 6 vehicle weaknesses.
What should I look for when buying a used GMC Sierra 1500 T1XX? +
faq.watch_a_avoid faq.watch_a_rec
Which engine is recommended? +
Good choice: L3B (2.7L Turbo I4). The most reliable engine is the L3B (2.7L Turbo I4) with the lowest risk score. The most fun to drive is the L87 (6.2L V8 EcoTec3). Problem engine: L84 (5.3L V8 EcoTec3) — stay away!
Which GMC Sierra 1500 T1XX engine is the most reliable? +
The {code} ({displacement}) is the most reliable engine in the GMC Sierra 1500 T1XX. It has the lowest risk score of all available engines and is rated "Good Choice". However, there are 5 known weaknesses to be aware of.
Which GMC Sierra 1500 T1XX engine is the most fun? +
The {code} ({displacement}) offers the most driving fun in the GMC Sierra 1500 T1XX — rated: "Fun to Drive!". {description} This is the truck GM wants to sell: 420 hp, Denali interior, MultiPro tailgate, magnetic ride. Then 597,000 L87 engines got recalled for metal shavings. NHTSA investigating if the oil-swap fix works. A post-recall Denali with clean oil analysis is a magnificent truck — if the engine holds.
Is the GMC Sierra 1500 T1XX worth buying used? +
The GMC Sierra 1500 T1XX requires careful consideration — choosing the right engine variant is crucial.
What horsepower variants are available for the GMC Sierra 1500 T1XX? +
The GMC Sierra 1500 T1XX is available with engine variants from 282 to 426 hp. Petrol: L84 (5.3L V8 EcoTec3), L87 (6.2L V8 EcoTec3), L3B (2.7L Turbo I4). Diesel: LM2 (3.0L Duramax I6).

Last updated: February 2026 · All information without guarantee