Diagsheet

2020 Chevrolet Blazer · symptom sheet

Check engine light or misfire

  • 34owner reports
  • 60,000median miles
  • $1,400median quote
  • 0involved a crash

Newest report Jun 5, 2026 · checked Sep 9, 2026

127 of the 213 complaints on this car are about the engine. 34 of those describe misfire.

Tick what matches of 34 reports

1
8

What got replaced

Owners who name the part that was replaced mention the sensor (14 reports).

Recalls and investigations

No recall on the engine covers the 2020 model year as of Sep 9, 2026.

NHTSA investigations into the engine on the Blazer

EA94-029opened Jul 29, 1994
Engine And Engine Cooling · model years 1989 to 1993

Engine compartment fires. Closed jul 31, 1996.

NHTSA summary
AN ALLEGED MALFUNCTION IN THE ATLERNATOR RESULTING IN ENGINE COMPARTMET FIRES.
PE94-050opened Jun 27, 1994
Electrical · model years 1989

Fire in dash/instrum.clstr. Closed sep 14, 1994.

NHTSA summary
There is no summary currently available
PE87-003opened Oct 27, 1986
Electrical · model years 1983 to 1984

Elect. failures/fires. Closed jul 16, 1987.

NHTSA summary
SUMMARY OF INFORMATION FROM THE MANUFACTURER: FORD HAS SUBMITTED 40 OWNERCOMPLAINTS WHICH ALLEGE IN-DASH FIRES. IT DOES NOT BELIEVE THAT THECOMPLAINTS INDICATE A DEFECT NOR ARE THEY SAFETY RELATED.ANALYSIS:A REVIEW OF THE COMPLAINTS WAS CONDUCTED.VARIOUS COMPONENTSWERE ALLEGED TO HAVE BEEN THE SOURCE OF THE FIRES.THE FAN MOTOR, BLOWERRESISTOR, WIRING, INSULATION, AND THE A/C CONTROL MODULE HAVE BEEN REPORTEDAS DEFECTIVE.THERE IS NO PATTERN OF DEFECT.NO REPORTED INJURIESSTATUS:CLOSED 6/30/87.======

None of these investigations covers the 2020 model year.

What owners paid

6 of the 34 reports quote a price. Each dot is one quote. The middle half runs $1,000 to $1,400.

$1,000$1,400$1,400
$0k$2k$4k$6k$8k

When it happens

The middle half of failures fell between 50,000 and 70,000 miles, from the 12 reports that gave a mileage.

121
223
624
1125
1426

What owners wrote

“2020 Blazer, 65,000 miles. Temp stuck on cold, A/C blows warm aor and driving assistance off. The radiator fan runs continuously. Check engine light on.”

Filed Apr 9, 2026 · 65,000 miles

“P0128 code for thermostat issue. Fans run after shutting car off. Steering assist reduced message. Check engine light. Chevy knows this is a common issue. This needs to be investigated asap.”

Filed Mar 10, 2026

“There seems to be a constant problem with the service driver assist error code popping up and check engine light coming on. The ac heating keeps losing temperature. I've looked for support for this issue and it seems to be a common problem for chevy owners. Why isn't there a recall on this.”

Filed Dec 23, 2025

“Engine light on, power steering assist, air conditioning stop working diagnostic tool read p0128 coolant thermostat”

Filed Oct 8, 2025

Should you keep driving it?

This page can't tell you that. 0 of 34 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.

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