General Motors Releases May 2021 Over The Air Update

General Motors has released a new over the air (OTA) update for vehicles running its Global B architecture, including the 2020 Corvette as well as 2020 Cadillac CT4 and CT5 sedans.

Improvements made through this May 2021 update may vary by model, build configuration, system, and sales region, the automaker says. Additionally, not all vehicles have all features that this OTA update applies to, so some of the changes will not be applicable to certain vehicles. With that said, here’s a list of the various problems and bugs that this update looks to fix:

Audio

• Loss of chime may occur when switching from Run to Propulsion after second chime sounds
• No media audio could occur at startup
• Mute could be inoperative while turn signal is active
• Volume may change unwanted
• Volume may ramp up at startup if the Steering Wheel Control Vol Up is pressed for 3-4 seconds during bootup
• Increase chime volume for trunk ajar

Bluetooth

• Contacts may show unavailable, may only partially download or sync after changing User Profiles, or may get stuck at any percentage of the download

HMI

• Blank screen could occur when transitioning from Performance Data Recorder (PDR) to radio

Home screen

• Porch/summary view may display Climate Off message for a couple of seconds after an ignition cycle
• Using embedded media app (Ex: iHeart) the Home screen may still display the previous Source logo
• Upper status bar may not display connected Bluetooth device information
• Changing Favorites with steering wheel controls (SWC) may respond slower than changing them with on-screen touch input
• When rapidly changing Favorites on radio, the metadata in the DIC Audio Page may not match what is shown in the radio audio page or Porch/summary view display
• When rapidly changing Favorites in a connected device, the Favorite selected might toggle back and forth before settling on one selected
• My Mode, Engine Sound Settings, and Remote Mirror Folding descriptions may have text cut off
• Auto indicator in HVAC popup may not illuminate to match active Auto status
• During an OTA update the radio may display a Settings page instead of the Programming screen
• Powertrain mode could show Normal instead of Tour
• (Non-GMNA) The PDR Auto Recording pop up may only appear in English
• (Non-GMNA) Errors may occur in displaying the Korean keyboard
• Attempting to make a phone call through a connected phone or Android Auto, the system may attempt to make the call through OnStar
• Instrument cluster Favorites and PTT Menus may disappear for remainder of drive cycle after changing Favorites
• The Head Up Display (HUD) may not display SXM metadata if user switches from AM/FM Favorite to SXM Favorite
• Radio display may toggle or flicker between PDR screen, Home screen, and PDR screen with Status bar
• In rare occurrences where powering moding is changing quickly and repetitively, there may be a no audio condition at startup until user enters the Audio app
• May not be able to make an outgoing call when selecting a contact from the Recent list
• During an OTA update the user may see the Settings page instead of the Update status
• After an OTA update the user may see the Update page instead of the Home page
• Error in translations of Ionizer, Location Based Auto Lift, PDR Auto Recording, and My Mode
• Incorrect message may be displayed in Valet mode at startup when PDR is only recording video, not audio
• (Non-GMNA) HVAC dials and radio display may show mismatched values
• Driver Information Center (DIC) may be blank
• Favorites list may not appear in the instrument cluster during an active navigation route

Navigation

• Changing language in an active navigation route could cause nav app to stop working
• In Porch/summary view the navigation maneuver or highlighted route might get stuck or be incorrect for next maneuver
• Directions sent from the myBrand app may be lost if vehicle is remote started

Projection

• Android Auto audio may drop out for approximately one second
• While in CarPlay and during an OnStar Advisor call, the driver may not be able to hear the Advisor if a CarPlay incoming call session is active
• If Android phone enters full sleep it may not recover connection for Android Auto
• Apple CarPlay could display a blank screen
• When using Apple CarPlay Driver Information Center (DIC) may display device is unreadable
• Apple music may cut out
• The HUD Audio page may overlay the display every two seconds for an entire drive cycle when Android Auto is the source
• The song title may not appear in HUD Audio page when playing Pandora via Android Auto

Systems

• Improved RVC rolling count diagnostics
• When changing the Teen Driver PIN, a Retry popup may appear after entering the new number the second time
• Radio display may be non-responsive to touch
• Radio may create a parasitic battery drain
• With Performance Data Recorder active, shifting to Reverse may not transition to rear view camera
• If an OTA Download or Install message is ignored, subsequent ignition cycles might show Update Available message without first seeing a Drive to Park shift event
• OTA Install Update message may not appear if vehicle was started using Remote Start
• During OTA Installation, if ignition mode transitions to Accessory, Run, or Propulsion mode as display Update Successful command is sent, the radio may instead display Update Failed even though it was successful
• If the LVDS cable is disconnected (during technician diagnosis) it may cause the radio System Server to crash
• Improve diagnostic algorithm of U3000 Symptom Byte 4B to reduce occurrences of a false DTC
• Improve diagnostic algorithm of B1A1F Symptom Byte 00 to configure DTC enable conditions
• Radio display may go blank when user switches to rear seat infotainment (RSI) secondary video input
• In very rare cases OnStar may not go to sleep when OTA Install fails due to a user turning the vehicle on during its second OTA Installation attempt

Voice Recognition (VR)

• Connected phone may not respond to Voice commands
• Voice Recognition may not respond only when using SiriusXM (SXM) commands Voice •Recognition may not respond for an entire ignition cycle
• Navigation app may not launch when using VR

To reiterate, the only GM vehicles that these OTA updates will apply to are 2020 models that use the Global B electric architecture, including the 2020 Chevrolet Corvette, Cadillac CT4 and Cadillac CT5. Global B, which is also referred to by GM as the Vehicle Intelligence Platform, will be present in most of the automaker’s production vehicles by 2023. It will be particularly important to the automaker’s new line of electric vehicles, enabling it to remotely adjust an EV’s motor and battery settings, among more.

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