2021 GMC Sierra 1500 · symptom sheet
Engine rattles or ticks
- 26owner reports
- 39,000median miles
- 0involved a crash
Newest report Aug 20, 2026 · checked Oct 2, 2026
350 of the 573 complaints on this car are about the engine. 26 of those describe engine rattle.
Tick what matches of 26 reports
Engine rattle on other Sierra 1500 years
Report counts are for each model year on its own, so a newer car has had less time to collect them. Model years with too few reports of it for a sheet: 2014, 2015, 2016, 2017, 2018, 2020, 2022, 2023, 2024, 2025, 2026.
What this problem usually is
Owners in this group hear something before anything breaks. Most describe a ticking or tapping at idle, a rattle that's worse on a cold start and fades as the engine warms, or a noise that comes and goes over weeks. Some report the check engine light following a while later. It's the early-warning end of the engine complaints, and the reports that end in a named part are useful to anyone hearing the same sound.
What got replaced
Owners who name the part that was replaced mention the lifters (10 reports).
Recalls and investigations
One recall on the engine covers the 2021 model year. A recall on the same system isn't always the same failure, so read the defect text.
The connecting rod and/or crankshaft engine components may have manufacturing defects that can lead to engine damage and engine failure.
All 7 recalls on the 2021 GMC Sierra 1500, with the owner complaints on each recalled system
NHTSA investigations into the engine on the Sierra 1500
Loss of motive power due to engine failure post recall remedy. Open.
Loss of motive power due to engine failure post recall remedy. Closed aug 20, 2026.
Loss of motive power due to engine failure. Open.
Loss of motive power due to engine failure. Closed oct 23, 2025, led to recall 25V-274.
When it happens
The middle half of failures fell between 22,000 and 56,802 miles, from the 9 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 8 service bulletins or notices for the 2021 GMC Sierra 1500 that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
This bulletin advises the tech that the Exhaust Roller Follower may be the issue with the engine Ticking noise, misfire or rough run and what to replace if found the cause.
This service bulletin provides a service procedure to correct a condition of a Ticking Noise from the Engine.
This bulletin advises the technician to Inspect the position of the head gasket locating tabs to determine if the head gasket(s) has been possibly installed backwards to correct a concern of an Engine Thermostat Tick Noise and/or Running Hot.
This Preliminary information communicates information on correcting a rattle noise from the underbody exhaust heat shield.
4 more on the 2021 GMC Sierra 1500 page.
What owners wrote
“Driving normal traffic . Started hearing ticking . Check engine light flashing ,service esc and braking system light up. Parking not loud ticking from engine bay”
Filed Apr 29, 2026
“At cold start-up, engine (6.2) makes a metal-to-metal grinding sound for 60-90 seconds. After warm-up, a steady tick on the right side of the engine while running. I contacted GM and they said, " this was normal at start up". however, with me being a mechanical engineer, all of my school and working experience tells me anything grinding metal to metal is not good.”
Filed Apr 2, 2025
“5300 miles and when you accelerate it knocks and or ticks, and loss of power all lights on dash came on”
Filed May 16, 2021 · 5,300 miles
Should you keep driving it?
This page can't tell you that. 0 of 26 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Paid for this repair before a recall covered it? How recall reimbursement works
Other problems on this car
- Engine failure, knocking or rod bearing 126 reports
- Check engine light or misfire 104 reports
- Engine stalls or loses power while driving 88 reports
- Engine overheats or leaks coolant 53 reports
- Transmission shudders, slips or shifts hard 43 reports
- Infotainment, screen or backup camera fails 26 reports