GMC

Sierra EV

2024-2026

All

All

All

All

Copyright 2026 General Motors. All Rights Reserved.

Page 2
Brand:

April, 2026
Model:

Bulletin No.: PIC6629D

Model Year:
from

VIN:
to

from

Engine:

Transmission:

to

GMC

Terrain

2025-2026

All

All

All

All

GMC

Yukon

2022-2026

All

All

All

All

GMC

Yukon XL

2022-2026

All

All

All

All

Involved Region or Country

United States

Additional Options (RPO)

IVA, IVD, IVE, IOK

Condition

Customer may comment about an issue with either the radio or IPC display. Please
reference the appropriate procedure based on the symptom list in the correction section
of this document.

Cause

Concerns may be caused by software or hardware anomalies

Correction
• (IVA, IVD, and IVE only) If the entire display (cluster and radio) is blank or black refer to Whole or both displays
are blank
• If only one display is blank refer to If one display is blank section of this document
• If one or both displays are flickering refer to the If one or both displays are flickering going blank but comes back
• If touch input is unresponsive, refer to Radio display does not respond to touch or radio appears to be
constantly restarting
• If the power/mute, and/or home button, or volume knob is not working refer to Volume knob, home button, and
or power/mute button inoperative
• For HVAC button concerns refer to the One or multiple HVAC hard buttons inoperative (GMC Acadia, Terrain,
Sierra EV, Yukon and Hummer only)
Note: If a customer comes in stating that their display went blank or black at some point, but is currently not blank or
black, please update the radio to the latest software and clear DTCs and attempt to duplicate the customers concern
before proceeding with this diagnostic.
Note: For Escalade and Escalade IQ only, if the passenger side of the display is inoperative, please investigate an
issue with the passenger infotainment system refer to SI diagnostics
Note: If at any point the display recovers following any of the procedures below, please update the radio to the latest
software and release the vehicle back to the customer
Note: If there is obvious damage to the display it is not necessary to follow the procedure below and a replacement
display can be ordered
Whole or both displays are blank (IVA, IVD and IVE only)
Examples of whole or both displays are blank or black

Bulletin No.: PIC6629D

April, 2026

Page 3

7019592

7019593

Verify if the screen is black (appears off), or if a backlight is present on the display refer to specific procedure below
based on symptom see pictures below
Display is backlit but there is no image
1. If back light is present, but there is no display this means that the display is powered on, but there is poor signal
from the radio or a bad connection, first check for any relevant DTCs.
2. If DTCs are present refer to SI diagnostics. If SI leads you to a radio or display replacement, please refer back to
this diagnostic.
3. Refer to PIC6540 and attempt to reboot the radio, if radio display does not return, please refer back to this
diagnostic and proceed to next step.

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April, 2026

Bulletin No.: PIC6629D

4. Perform a wiggle test where the wire meets the connector body of the LVDS cable. If display recovers, replace the
LVDS cable
5. If it passes the wiggle test disconnect and reconnect the connectors at the display. If concern is corrected by
disconnecting and reconnecting the display, check for a possible cable or connection issue and replace/repair the
cable or wiring if necessary
6. If that does not correct the concern, please refer to PIT6393 for IVD and IVE radio, PIC6611 for IVA radio for
further diagnosis
7. If after following PIT6393 or PIC6611 and the radio was ruled out or replaced and the concern is still present, all
displays are on restriction and when ordering a display from the ESC you must answer the following attestation
question at the bottom of this document.
Display appears powered off (no backlight)
1. Verify the radio is powered on and is communicating with the scan tool.
2. If radio is not communicating refer to PIT6393 for IVD and IVE radios or PIT6611 for IVA radios as there is an
issue with the radio, not the display.
If there is communication check for relevant DTCs. If DTCs are present refer to SI diagnostic.
If SI instructs you to replace the radio or display, please refer back to this document and proceed to the next step.
3. Refer to PIT6540 to attempt to restart the radio, if radio display does not return refer back to this document.
4. Wiggle test the LVDS connector where the wire meets the connector. If the display recovers, replace the LVDS
cable
5. Disconnect and reconnect all connections at the display and verify power and ground are present. If the screen
recovers after a disconnect and reconnect of the display, please investigate a possible connection or wiring issue
within the display wiring.
6. If display is still not turning on and there is communication with the radio refer to PIT6393 for IVD and IVE radio, or
PIC6611 for IVA radios for further diagnosis.
7. If after following PIT6393 or PIC6611 and the radio was ruled out or replaced and the concern is still present, all
displays are on restriction and when ordering a display from the ESC you must answer the following attestation
question at the bottom of this document.
If one display is blank
If one display is blank
Below are examples of one, or portion of the display is blank

Bulletin No.: PIC6629D

April, 2026

Page 5

7019594

7019595

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April, 2026

Bulletin No.: PIC6629D

7019596

7019597

Note: For RPO IOK only, this procedure will only apply to the radio display. If there is an issue with the IPC, this
procedure does not apply and follow SI diagnostics for IPC concerns.
Display is backlit
1. If back light is present, but there is no display this means that the display is powered on, but is there poor signal
from the radio or a bad connection, first check for any relevant DTCs.
2. If DTCs are present refer to SI diagnostics. If SI leads you to a radio, or display replacement, please continue with
this diagnostic.
3. Refer to PIC6540 and attempt to reboot the radio, if radio display does not return, please refer back to this
diagnostic and proceed to next step.

Bulletin No.: PIC6629D

April, 2026

Page 7

4. Wiggle test the LVDS connector where the wire meets the connector. If the display recovers, replace the LVDS
cable
5. Please disconnect and reconnect the LVDS connection at the radio and the display that is blank.
6. If concern is corrected by disconnecting and reconnecting the LVDS cable, check for a possible cable or
connection issue with the LVDS cable and replace the cable if necessary.
7. If that does not correct the concern please refer to PIT6393 for IVD and IVE radio, PIC6611 for IVA, or PIC6602
for IOK radio for further diagnosis.
8. If after following PIT6393, PIC6611, or PIC6602 and the radio was ruled out or replaced and the concern is still
present, all displays are on restriction and when ordering a display from the ESC you must answer the following
attestation question at the bottom of this document.
Display appears powered off (no backlight)
1. Check for any relevant DTCs.
2. If DTCs are present refer to SI diagnostics. If SI leads you to a radio, or display replacement, please continue with
this diagnostic.
3. Refer to PIT6540 to attempt to restart the radio, if radio display does not return refer back to this document.
4. Wiggle test the LVDS connector where the wire meets the connector. If the display recovers, replace the LVDS
cable
5. Disconnect and reconnect all connections at the display and verify power and ground are present. If the screen
recovers after a disconnect and reconnect of the display, please investigate a possible connection or wiring issue
within the display wiring.
6. If display is still not turning on refer to PIT6393 for IVD and IVE radio, PIC6611 for IVA radios, or PIC6602 for IOK
for further diagnosis.
7. If after following or coming from PIT6393, PIC6611, or PIC6602 and the radio was ruled out or replaced and the
concern is still present, all displays are on restriction and when ordering a display from the ESC you must answer
the following attestation question at the bottom of this document.
If one or both displays are flickering, going blank but comes back
Note: For IOK only this procedure will only apply to the radio display if there is an issue with the IPC, this procedure
does not apply and follow SI diagnostics for IPC concerns.
Note: If the display is flickering only while in a camera view, refer to SI for camera diagnosis.
Note: If flickering is only observed while using phone projection, verify that customers cellular device is up to date
and refer to SI for phone projection for further diagnosis.
1. Check for any relevant DTCs.
2. If DTCs are present refer to SI diagnostics. If SI leads you to a radio, or display replacement, please continue with
this diagnostic.
3. Verify radio is up to date and if it is not, attempt to update the radio.
4. Wiggle test the LVDS connector where the wire meets the connector. If the display recovers, replace the LVDS
cable
5. Once radio is up to date and the concern is still present, verify the power and ground connections at the displays
and the LVDS cable between the display and radio. If concern is corrected by disconnecting and reconnecting the
power and ground at the displays, or the LVDS cable between the radio and displays check for a possible cable or
connection issue and repair as necessary.
6. If condition still exists, please refer to PIT6393 for IVD and IVE radio, PIC6611 for IVA radio, or PIC6602 for IOK
for further diagnosis.

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April, 2026

Bulletin No.: PIC6629D

7. If after following PIT6393, PIC6611, or PIC6602 and the radio was ruled out or replaced and the concern is still
present, all displays are on restriction and when ordering a display from the ESC you must answer the following
attestation question at the bottom of this document.
Radio display does not respond to touch or radio appears to be constantly restarting
1. Attempt to restart the radio, refer to PIC6540.
2. Wiggle test the LVDS connector where the wire meets the connector. If the display recovers, replace the LVDS
cable
3. If the concern is still present disconnect and reconnect the connections at the display.
Caution: For EVs only - Please refer to SI Battery Negative Cable Disconnection and Connection for proper
procedure of disconnecting and reconnecting the 12 volt battery.
4. If the concern is still present refer to PIC6393 for IVD and IVE, PIC6611 for IVA, or PIC6602 for IOK.
5. If after following PIT6393, PIC6611, or PIC6602 and the radio was ruled out or replaced and the concern is still
present, all displays are on restriction and when ordering a display from the ESC you must answer the following
attestation question at the bottom of this document.
Volume knob, home button, and or power/mute button inoperative (IVA, IVD, and IVE only)
1. Verify mute and volume buttons from the steering wheel are operable, if they do not work refer to PIT6393 or
PIC6611.
2. If steering wheel buttons work, update the radio to the latest software.
3. Attempt to restart the radio, refer to PIC6540.
4. If the concern is still present disconnect and reconnect the connections at the display.
5. If the concern is still present refer to PIC6393 for IVD and IVE or PIC6611 for IVA.
6. If after following PIT6393 or PIC6611 and the radio was ruled out or replaced and the concern is still present, all
displays are on restriction and when ordering a display from the ESC you must answer the following attestation
question at the bottom of this document.
Volume knob, home button, and or power/mute button inoperative (IOK only)
Note: For the 2025 Silverado 1500, Sierra 1500, 2025 Silverado 2500/3500HD and Sierra 2500/3500HD built before
June 6, 2025, with this condition, refer to 25-NA-313 before proceeding.
1. Attempt to restart the radio, refer to PIC6540.
2. If PIC6540 does not correct the concern, please do a fuse pull of the radio.
3. If a fuse pull does not work, please disconnect the battery for 15 minutes and reconnect.
4. If the concern is still present disconnect and reconnect the connections at the display.
5. If the concern is still present refer to PIC6602.
6. If after following PIC6602 and the radio was ruled out or replaced and the concern is still present, all displays are
on restriction and when ordering a display from the ESC you must answer the following attestation question at the
bottom of this document.
One or multiple HVAC hard buttons inoperative (GMC Acadia, Terrain, Sierra EV, Yukon and Hummer only)
1. Check for any relevant DTCs.
2. If DTCs are present refer to SI diagnostics. If SI leads you to a radio, or display replacement, please continue with
this diagnostic.
3. Refer to PIT6540 to attempt to restart the radio, if the buttons still do not work, refer back to this document.
4. Update radio to the latest software.
5. Verify you can control the HVAC through the display instead of the buttons.

Bulletin No.: PIC6629D

April, 2026

Page 9

6. If only the hard buttons do not work, replace the display, if neither the display or the hard buttons work proceed to
the next step.
7. Disconnect and reconnect all connections at the display and verify power and ground are present. If the buttons
regain functionality after a disconnect and reconnect of the display, please investigate a possible connection or
wiring issue within the display wiring.
8. If the buttons still do not work refer to PIT6393 for IVD and IVE radio, PIC6611 for IVA radios, or PIC6602 for IOK
for further diagnosis.
9. If after following or coming from PIT6393, PIC6611, or PIC6602 and the radio was ruled out, please refer to SI for
an issue with the HVAC system.
Attestation question: Have you followed PIC6629 based on one of the symptoms/condition below and the vehicle
requires a display replacement?
• Physical damage
• Whole or both displays are blank
• One display is blank
• Radio and/or IPC display is flickering section
• Radio display does not respond to touch
• Volume knob, home button, and or power/mute button inoperative
• One or multiple HVAC hard buttons are inoperative (GMC Acadia, Terrain, Sierra EV, Yukon and Hummer only)

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April, 2026

Bulletin No.: PIC6629D

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

Description

Labor Time

3429852

Radio reset

0.5

3481408*

Disconnect and reconnect
the display

Envision,
Enclave
Encore GX,
Envista – 0.3
LYRIQ, XT4,
CT5, OPTIQ,
VISTIQ – 0.3
CELESTIQ,
Escalade,
and
ESCALADE
IQ – 1.2
Silverado EV
not WT,
Equinox EV,
Blazer EV,
Equinox,
Tahoe (IVE
only) – 0.5**
Colorado and
Canyon
Radio display
–0.3
Colorado and
Canyon IPC
display - ST
Acadia Radio
display– 0.9
Acadia IPC
display – 1.0
Sierra EV
Radio display
– 0.3
Sierra EV
IPC
display-0.8
Terrain Radio
display – 0.7
Terrain IPC
display – 0.4
Traverse
Radio
display– 0.4
Traverse IPC
display – 0.3
Yukon (IVE
only) Radio
display- 1.1
Yukon (IVE
only) IPC
display – ST
Trax,
Trailblazer –
0.5**
Silverado and
Sierra pickup
radio display
IOK only –
0.7
MY22 and 24
Tahoe and
Yukon Radio
display with
IOK – 0.5
Corvette
radio display
with IOK-1.6
Corvette

Bulletin No.: PIC6629D

April, 2026

Version

5

Modified

11/11/2025 - Created on.
11/13/2025 - Updated to add CELESTIQ to the models
12/12/2025 - Updated to add labor time for Traverse
03/05/2026 - Updated to clarify verbiage in correction
04/23/2026 - Updated to clarify verbiage in correction

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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