Bulletin No.: PIT5839B
Published date: 08/18/2021

Preliminary Information
PIT5839B Radio System Settings Lost or Returning to Default
Values
Models
Brand:

Model:

Model Years:

VIN:
from

Engine:

to

Transmissions:

Chevrolet

Blazer

2020

All

All

All

All

Chevrolet

Camaro

2020

All

All

All

All

Chevrolet

Colorado

2020 - 2021

All

All

All

All

Chevrolet

Equinox

2020 - 2021

All

All

All

All

Chevrolet

Malibu

2020

All

All

All

All

Chevrolet

Sonic

2020

All

All

All

All

Chevrolet

Trax

2020 - 2021

All

All

All

All

GMC

Canyon

2020 - 2021

All

All

All

All

GMC

Terrain

2020 - 2021

All

All

All

All

North America, Middle East, Israel, Palestine, Argentina, Brazil, Chile, Colombia,
Involved Region or Country Ecuador, Paraguay, Peru, Uruguay, Korea, Thailand, Australia/New Zealand, Egypt,
Africa
Additional Options (RPO)
Equipped with Infotainment system IOR
Customers may comment about any combination of the following Radio System
Settings being lost, not retained, or returning to a default value after the ignition is
turned o and the radio goes to sleep:

Condition

Cause

Audio Tone Settings; including equalizer or EQ, Fade, Balance, or Sound Mode
return to a neutral, zero, or default value
Language setting defaults back to English from any other language
Radio Maximum Startup Volume has changed leading to a complaint the
volume is louder or not as loud as what it was during the previous drive cycle
Radio starts on a page di erent than what was displayed in the previous drive
cycle. Examples: next ignition the radio is O or at OnStar page instead of
Audio page
(This condition now has a service procedure for Silverado/Sierra contained in
TSB 21-NA-182)
The cause of this condition is unknown but appears to only occur with software
version V135118. This software was built into 2021 model year vehicles listed but
would not be present in a 2020 model year vehicle unless the radio was
reprogrammed or replaced and programmed with the V135118 software version.
(This condition now has a service procedure for Silverado/Sierra contained in TSB
21-NA-182)

Correction:
Do NOT replace parts for this condition. Engineering is aware of the issue and investigating the root cause. A
workaround has been identi ed that may provide temporary relief of the symptoms described above.
(This condition now has a service procedure for Silverado/Sierra contained in TSB 21-NA-182)
Service Procedure
Note: this PI condition only exists in software version V135118. If any other software version is in the radio then
stop, this PI does not apply. Refer to SI for diagnostics.
1. Verify the radio software version as this issue only pertains to version V135118. On the radio display, select
Home, Settings, About. On this page will be what appears like a long le name. In the middle of this le
name will be 135118.

If the version is V135118 proceed to Step 2.
If the version is numerically less than V135118 then this PI does not apply. Refer to SI for diagnostics.
Tip: Before resetting the radio, please record the customer’s stored Favorites so that they can be re-entered
afterward. Once selected it is important to wait for the radio to complete this process and reboot itself
before the ignition is turned o .
Note: The reset may not provide any more than temporary relief of the symptoms. Engineering is still
working to identify a root cause. If the condition returns, please submit a Field Product Report with
reference to this PI number. Any information provided through Field Product Reports on how long the
symptoms were gone, and what symptoms returned can be used to assist engineering in the root cause
e orts.
2. Perform a radio reset by selecting “Erase settings and personal data” under the “Restore to factory
settings.” Please document in the Warranty claim submission whether this was successful in preventing a
loss of settings.
We apologize for any inconvenience this may cause. This PI will be updated, or replaced by a bulletin, as
additional information becomes available.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation
3487318

Description
Labor Time
Verify radio software version V135118
0.2
*This is a unique Labor Operation for Bulletin use only.

Version History
Version
Modi ed

2
04/27/2021 - Created on.
05/07/2021 updated to add an additional condition and a potential

temporary workaround for the conditions listed.
08/18/2021 Updated to remove Silverado and Sierra fix
available for these models in 21-NA-182

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