VinCanary

Reliability report · 2019 GMC Sierra 1500 · Updated July 2026

Launch year of the new truck — same DFM lifter risk as the Silverado, plus a couple of Sierra-only quirks to check.

2019 launched the current-generation Sierra, and launch-year growing pains fill the file: ten recalls including battery-cable, driveshaft, and pretensioner items that carry stall or fire risk, plus a wave of remote-start electronic-brake-warning failures ('Brake System Failure, 62 mph top speed'). Both bodies sold in 2019 — the new T1XX and the carryover Limited — are covered here.

The bigger story is shared with the Silverado: 2019 introduced Dynamic Fuel Management (DFM), whose lifters fail more often and earlier than the old AFM, plus an oil-cooler-line leak GM covered under a Customer Satisfaction Program. Sierra-specific things to check: the MultiPro powered tailgate (a slam-open complaint) and the rear sliding-window leak. Same truck under the skin — see the 2019 Silverado 1500 report.

Evidence: 406 NHTSA complaints · 10 recall campaigns · 6 mechanic & forum sources

Canary status

Squawking

What that means: First year of the T1XX Sierra and the first year of Dynamic Fuel Management — a lifter system mechanics say fails more often and earlier than the old AFM. Ten recalls, several fire- or brake-related. Add the Sierra's MultiPro tailgate and the launch-year electronic-brake-warning wave, and it's a buy-with-the-checks-done truck.

CalmChirpingSquawkingFainted

406

Federal complaints

10

Recalls

$3,000–$10,000

Lifter/valvetrain repair after failure

~$150

DFM disabler module (preventive)

Known issues

Ranked by the cost of ignoring them. Every claim carries its source.

5.3L / 6.2L Dynamic Fuel Management (DFM) lifter failure

major

2019 is the pivot from AFM to DFM, and it's a durability downgrade: DFM can deactivate any of all eight cylinders, doubling the problematic two-piece lifters and running deactivated more of the time, so lifter failure comes more often and at lower mileage. Symptoms are a tick, misfire, power loss, sometimes a 'pop' and sudden shutdown; repair is $3,000–$10,000. No blanket recall — a class action alleges the defect and GM repairs reactively. A cold-start valvetrain tick is a walk-away; a DFM disabler or documented lifter history is the protection.

What to check

Pink and cleanServiced. Proceed.

Dark brownDamage underway.

DFM disabler module (preventive)

~$150

Lifter/valvetrain repair after failure

$3,000–$10,000

Sources: NHTSA complaint database, 2019 Sierra 1500 and Sierra Denali · Independent mechanic transcripts (T1XX Silverado/Sierra; AFM/DFM lifter deep-dives)

Engine oil-cooler line leak — Customer Satisfaction Programmajor

GM ran a Customer Satisfaction Program for 2019 trucks covering engine oil-cooler (EOC) lines that leak and detach at the crimp joints — worse in cold weather. A Sierra Denali owner in the file describes it exactly: 'Turn off engine, no oil pressure' at 30 mph, the dealer finding the oil-cooler line detached at 77,000 miles. Continued driving after a detachment risks loss of propulsion and engine damage. The remedy replaces the lines, oil, and filter. Some owners find their VIN isn't included and pay out of pocket — confirm eligibility and whether the work was done.

Sources: NHTSA complaint database, 2019 Sierra 1500 and Sierra Denali · NHTSA recall database and manufacturer communications (oil-cooler-line CSP; recall documents)

$0

Under the oil-cooler-line CSP

hundreds to thousands

Out-of-program line/engine repair

MultiPro tailgate slam-open (Sierra-specific)moderate

The Sierra's signature feature is the MultiPro multi-function powered tailgate — and a 2019 owner reported it slamming open rather than lowering gently, striking a child in the chest, both from the key fob and the dash button. It's a GMC-exclusive item not found on the Silverado, and there's no recall. On any Sierra with the powered tailgate, exercise every tailgate function and watch for abrupt, uncontrolled motion.

Sources: NHTSA complaint database, 2019 Sierra 1500 and Sierra Denali

Rear sliding-window leaks and launch-year brake/electrical recallsmoderate

Two launch-year clusters. The power sliding rear window (2019–2022 crew cabs) can leak where the sliding pane meets the frame, wetting the headliner and killing the backup camera. And a wave of remote-start electronic-brake-control failures throws 'Brake System Failure 62 mph top speed / Service ESC / reduced steering assist' — addressed by EBCM software recalls 19V889 and 20V055 (both free). Several fire/stall recalls (battery cable 19V888, driveshaft 20V650, pretensioner 19V814) round out the year. Check the rear headliner for staining and confirm every recall by VIN.

Sources: NHTSA complaint database, 2019 Sierra 1500 and Sierra Denali · NHTSA recall database and manufacturer communications (oil-cooler-line CSP; recall documents)

8-speed transmission shuddermoderate

The 2019 trucks pair some engines with the 8-speed automatic, which carries the same shudder and hard 1–2 shift the third generation was known for — enough to feed a class action on 2019–2020 models. Sierra owners report it 'shakes at all speeds' with hard shifts that 'chirp the rear tires.' The 10-speed on other trims is much better. Test-drive for shudder and prefer the 10-speed or a documented fluid service.

Sources: NHTSA complaint database, 2019 Sierra 1500 and Sierra Denali · Independent mechanic transcripts (T1XX Silverado/Sierra; AFM/DFM lifter deep-dives)

'Turn off engine, no oil pressure' at 30 mph — the dealer found the engine oil cooler line had detached.
6 mechanic & owner sources

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Open recalls

Free fixes at any GMC dealer. Run the VIN — “completed” isn’t always completed.

  1. 19V888Battery positive (B+) cable connection can be intermittent — risk of stall and, from arcing, fire (2019–2020); inspect/clean/replace, free.open
  2. 20V650A driveshaft weld may not be complete and the shaft can separate, causing loss of propulsion (2019–2020); driveshaft replaced free.open
  3. 19V814Seat-belt pretensioner can vent hot gas that ignites the carpet — fire risk (2019–2020); bracket opening closed off, free.open
  4. 20V792Front-center seat-belt bracket may not be secured to the seat frame (2019–2021); inspected/reassembled free.open
  5. 19V889EBCM software error can disable stability control and ABS without a warning light (2019 Sierra); reprogram, free.open
  6. 20V055Follow-up EBCM software error can disable electronic brake assist (2019 Sierra); reprogram, free.open
  7. 18V868Passenger frontal airbag module may have been damaged in assembly and not inflate properly (2019 crew cab); module replaced free.open
  8. 21V115Continental tires may have been overcured and can lose air or shed tread (2019–2020); inspect/replace as needed, free.open
  9. 21V423Additional overcured Continental tire recall (2019); inspect/replace, free.open
  10. 21V98517-inch spare may be incompatible with certain accessory wheels, affecting ABS (2019–2021); compatible spare/wheel provided free.open

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