7.4

pretty bad
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
7,073 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2020 GMC Sierra 1500 electrical problems

electrical problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2020 GMC Sierra 1500:

Unsubscribe any time. We don't sell/share your email.

2020 GMC Sierra 1500 Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #16

Jan 062021

Sierra 1500 8-cyl

  • 9,000 miles

A D V E R T I S E M E N T S

[xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Jackson, MO, USA

problem #15

Dec 202020

Sierra 1500

  • 15,000 miles
On two separate occasions, the truck has been dead when attempting to crank. There were no lights or devices left on after the previous time the truck had been used. Something is drawing power from the battery causing it to be dead. After recharging the battery, the check engine codes read that there is a problem with 'brake light illumination.' Help in determining wha T is causing the battery to die on such a new vehicle would greatly appreciated! I'm uncertain at this time as to whether or not the brake light illumination is causing a safety hazard.

- Greenwell Springs, LA, USA

problem #14

Dec 102020

Sierra 1500

  • 6,400 miles
After having all sorts of warnings over time like "service ESC, " "service parking brake, " and more, I now see "brake system failure: 62 mph top speed" flash across my dash. I am reading and hearing that this is a very dangerous problem. New truck. Brand new. Had it less than a year. Brake message always on start up.

- Sierra Madre, CA, USA

problem #13

Oct 142020

Sierra 1500

  • 2 miles

A D V E R T I S E M E N T S

There is no way to permanently disable the auto start stop on the vehicle. Several others have complained about this, no response from GM. There needs to be a firmware upgrade to the ECM to allow the owner make the decision on if that is enabled or disabled. On mine, I have to push a button each time I start the engine to disable that. Some GM vehicles don't have that option.

- Omaha, NE, USA

problem #12

Nov 052020

Sierra 1500

  • 550 miles
Keep getting "service safety restraint system " alerts. Vehicle only has 550 miles. Alerts are intermitent when driving. Contacted the dealer and was advised that unless it remains on they could not trace the issue.

- Hudson, OH, USA

problem #11

Sep 212020

Sierra 1500

  • 5,000 miles
Everything was fine for about 6 months after having purchased vehicle as new. Then I got warning lights asking me to both service the parking break and service ESC with a warning that driving would be compromised just over 60mph. I notified dealer who says they fixed the glitch but it happened again. The last time, most recently, I tried to start the truck the next day and all the warning lights came on. This was followed by a complete shut down. No engine, no lights - not even lock/unlock with key fob. It had to be towed. This is a 2020 vehicle and seems like it will strand me some place at the very least. Awful, expensive, and perhaps deadly dynamics here. GMC, get your act together. You owe us immediately. Provide the fix immediately or give me money back with no contest.

- Sierra Madre, CA, USA

problem #10

Sep 012020

Sierra 1500

  • miles

A D V E R T I S E M E N T S

Display is dangerously too bright when backing up cannot see to back up vehicle safely

- Terra Alta, WV, USA

problem #9

Sep 142020

Sierra 1500

  • 227 miles
Vehicle does not start and flashing various codes service just about everything on the vehicle

- Erath, LA, USA

problem #8

Mar 022020

Sierra 1500

  • miles
The night time backup camera is really bright and blurry and it makes it hard to see when backing at night

- Salem, IL, USA

problem #7

Aug 242020

Sierra 1500

  • 73 miles
Electronic ABS brake failure with 73 miles on odometer while stopped at red light alarm chimes sounded and power brakes were lost. Warning lights on dash ABS brake failure multiple engine warning lights came on. Dealer service was puzzled needed to contact GM technical support. Final outcome they are replacing the electronic brake module.

- Kearny, NJ, USA

problem #6

Aug 122020

Sierra 1500

  • 4,000 miles

A D V E R T I S E M E N T S

At 550 miles had to tow to dealer. They said needed to reprogram transmission. Now at 4000 miles, went to start and vehicle will not do anything. No power. It is being towed to dealer again. Pretty much bought a lemon as it looks now.

- North Richland Hills, TX, USA

problem #5

Jul 182020

Sierra 1500

  • 5,100 miles
Battery was dead in the garage. Called road side assistance who jump-started car. Car would not go into gear. We rolled it out into driveway where it sat for 24 hours. When it was loaded for travel to dealership, it cranked and was driven up on wrecker trailer like it had no apparent problems. Was carried to dealership where they recharged and checked the battery and reset 14 different codes which were lost with the low voltage.

- Etoile, TX, USA

problem #4

Jul 022020

Sierra 1500

  • 3,500 miles
Brand new truck purchased in May 2020. Vehicle would not start on 7/2/2020 and a new battery was placed in the vehicle. The truck would not start again on 7/17/2020 unknown reasons...

- Lima, OH, USA

problem #3

Apr 292020

Sierra 1500

  • 15 miles
Review camera is extremely bright when backing. It's so bright that a glare is thrown onto rear window making it next to impossible to see out rear window or use side view mirrors. I often revert to to open drivers door and looking backwards that way. Someone is going to get run over as you cannot see where you are backing. Very dangerous!

- Saranac Lake, NY, USA

problem #2

Feb 172020

Sierra 1500

  • 168 miles
Smell of smoke strong in the cab and outside hood of truck. Also have seen smoke coming from hood of truck. Smells like burning electrical or plastic

- Greensburg, PA, USA

problem #1

Feb 102020

Sierra 1500

  • 144 miles
Brand new truck. Stuck at the gym in the middle of the night truck wont start. The interior lights, head lights, and radio wont shut off. Vehicle wont start. I'm assuming the battery was drained because interior lights, exterior lights, radio, wont shut off. Has to be some kind of electrical malfunction. Waiting on GM roadside.

- Mesa, AZ, USA

Not what you are looking for?