Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
full bulletin at NHTSA ↗2020 Toyota Supra electrical problems
moderate 3 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
3
Recalls
0
Avg fix
$850
What stands out
Electrical accounts for 20% of all owner complaints filed against this vehicle, across 3 categories tracked.
No new NHTSA electrical complaint has been filed on this vehicle in over 3 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
full bulletin at NHTSA ↗TECHNICAL INSTRUCTIONS FOR LIMITED-SERVICE CAMPAIGN 24TD04 DATA COMUNICATION MODULE (DCM) UPDATE CERTAIN 2020 - 2023 SUPRA
full bulletin at NHTSA ↗Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
full bulletin at NHTSA ↗Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
What owners are reporting 3 most recent
Rear hatch will not open electrically and/or from the interior manual release handle. If someone gets stuck in the trunk or a pet, won't be able to come out. I had items I bought and if they included battery or dangerous item, my safety would be at risk. There is no rear realse hatch button from the outside the car. NO other problems or accidents. Is there any additional weight mounted on the…
There was a beep and then my dashboard went completely blank (was just dark) so I couldn't see any information such as how many miles per hour I was driving or how much gas I had or my navigational information or what gear I was in. Then the dashboard came back on and it said there was reduced driver assitance (but did not say what was wrong). The dealer says my dashboard should not have gone…
The 2020 - 2025 Toyota Supra is manufactured by BMW and uses virtually all components supplied by BMW. The vehicle includes dual climate controls (driver / passenger) and the temperature of the air from the vents is controlled independently. It is known by BMW that the blend door or the actuator (motor) - which regulates how much cold versus hot air is mixed per the control setting - can break or…
Had electrical trouble with your 2020 Toyota Supra?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2020 Toyota Supra?
It's a documented issue but not catastrophic. 3 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2020/Toyota/Supra.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.