2021 Chevrolet Blazer · symptom sheet
Engine stalls or loses power while driving
- 25owner reports
- 42,000median miles
- $1,800median quote
- 0involved a crash
Newest report Sep 17, 2026 · checked Oct 2, 2026
92 of the 134 complaints on this car are about the electrical system. 25 of those describe stalling, which makes it the most reported problem on the 2021 Blazer.
Tick what matches of 25 reports
Stalling on other Blazer 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: 2020.
What this problem usually is
Stalling reports are some of the most alarming on the site. The engine quits while the car is moving, sometimes on a highway and sometimes at a stop. Many owners say it restarted right away and the dealer found no stored code, which is part of why these complaints pile up before anything gets fixed.
What got replaced
Owners who name the part that was replaced mention the fuel pump (5 reports) and the battery (4 reports).
Recalls and investigations
No recall on the electrical system covers the 2021 model year as of Oct 2, 2026.
NHTSA investigations into the electrical system on the Blazer
Upper control arm ball joint breakage. Closed jul 30, 1999.
Engine compartment fires. Closed jul 31, 1996.
Fire in dash/instrum.clstr. Closed sep 14, 1994.
Elect. failures/fires. Closed jul 16, 1987.
None of these investigations covers the 2021 model year.
What owners paid
6 of the 25 reports quote a price. Each dot is one quote. The middle half runs $700 to $2,000.
When it happens
The middle half of failures fell between 14,000 and 68,400 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 Chevrolet Blazer 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 service bulletin provides a procedure to replace the FPDCM if found to cause customers concerns of Crank No Start, Stalling, Malfunction Indicator Lamp (MIL) Illuminated – DTC P023F or P129F Set.
This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
This service bulletin advises the tech that the rotational Clicking Noise Heard After Engine Shut Down may be normal characteristics of the vehicle.
This Preliminary information communicates a vehicle may come to the dealer with a complaint of no start, stalling, rough idle, no acceleration, loss of power, erratic shifting, fuel gauge inoperative, MIL illuminated with various codes stored.
4 more on the 2021 Chevrolet Blazer page.
What owners wrote
“Driving along vehicle shut down in middle of road replace fuel pump, fuel module control in August 2025. Now both top and bottom fuel hose needs replacing. On Nov 2025 I smelled gas and vehicle shut down”
Filed Dec 3, 2025
“I was driving down 776 (a busy highway)Blazer completely shut off, so scary almost got hit by a semi, I donât know how he managed to get around me , I jumped out of car! Sure thought it was my day to die! Called police for help! Had it towed home then to garage , was told it was the electrical fuel modular! Havenât slept right in 3 days ! Iâm still so shaken up!”
Filed Sep 3, 2025
“The temp gage stays on cool. Ac does not work and the radiator fan stays on after car shuts off. Dealership finds nothing wrong.”
Filed May 4, 2025
Should you keep driving it?
This page can't tell you that. 0 of 25 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 Taking it to a shop? How to describe this problem so it gets found