PIT6015A Service Bulletin/Repair Instructions

Bulletin No.: PIT6015A

Published date: N/A
Preliminary Information

PIT6015A Diagnostic Tips When Having Di culties Programming

Or Adding Key Fob Transmitters

Models

Brand:

Cadillac
Model:

Escalade Models
Model Years:

2021 - 2024
VIN:

from to
Engine: Transmissions:
All
All All
All
Chevrolet Silverado 1500 New (RPO J22, VIN Digit 5 = A or D) 2022
All
All All
All
Chevrolet Silverado 1500
2023 - 2024
All
All All
All
Chevrolet Silverado 2500/3500 HD
2024
All
All All
All
Chevrolet Suburban
2021 - 2024
All
All All
All
Chevrolet Tahoe
2021 - 2024
All
All All
All
GMC
Sierra 1500 New (RPO J22, VIN Digit 5 = H or U)
2022
All
All All
All
GMC
Sierra 1500
2023 - 2024
All
All All
All
GMC
Sierra 2500/3500 HD
2024
All
All All
All
GMC
Yukon Models
2021 - 2024
All
All All
All
Involved Region or Country North America

Condition
In some cases, when performing the IMMO Immobilizer Learn to program or add

key fob transmitters, there has been some di culties or even error messages such

as, "0004 DEVICE CONTROL NOT AVAILABLE" Or "Communication Error".
Cause
The cause of these concerns could be one of many di erent possibilities.
Correction:

The information below is only for reference and normal SI diagnostics and programming instructions should

always be followed. When having di culties programming or learning key fob transmitters to a vehicle, the

following tips may help.

1. If programming new key fobs, verify the correct part number fob is being used. Also, make sure there is not a

VIN already learned to the new key fob by using the EL-52545 and follow the latest version of bulletin 21-NA-061.

2. Do not assume where the programming fob pocket is located, as it can vary from vehicle to vehicle. Use the

owner's manual to verify the proper location of the programming fob pocket.

NOTE: If there is still a fob transmitter programmed to the vehicle, one quick test to determine that the IMMO coil

is working properly and you have the correct programming fob pocket location, is to perform the following:

- Remove the battery from the fob that is still programmed to the vehicle.

- Move all fobs away from the vehicle.

- Try to start the vehicle and the results should be a DIC message stating no fob detected.

- Place the learned fob, with the battery removed, into the programming fob pocket and try to restart or power up

the vehicle. If the vehicle powers up, then you have veri ed the IMMO coil is working properly, and the correct
programming fob pocket is being used.

3. If there was any reprogramming, a module replaced, or any modules with a current DTC U1962, then make

sure the Serial Data Authentication Con guration (SDAC) has completed.

4. If there are any "Environment Identi er" DTC's set, they should be addressed.

5. During the IMMO Immobilizer Learn, after the ignition automatically powers on, make sure to set the parking

brake. Also, on vehicles with an Electronic Transmission Range Shifter, press the "Park" button on the shifter.

6. During the IMMO Immobilizer Learn, only place the key fob transmitter in the programming fob pocket when

instructed, and make sure ALL additional transmitters are AT LEAST 3 m (9.8 ft) away from the vehicle. Do NOT

place key fob transmitters on the roof, hood, etc. keep them away from the vehicle.

7. During the IMMO Immobilizer Learn, always stay with the TLC computer and the vehicle at all times so you can

follow ALL programming instructions, as SPS will instruct multiple times to perform various functions. If these

instructions are missed, the learn could fail.

8. During the IMMO Immobilizer Learn a "Communication Error" message maybe displayed. This error has been

seen when an aftermarket device is connected inline with the DLC, see the latest version of bulletin 13-08-116001H. Inspect and remove any aftermarket devices.

9. In some rare cases, if the computer/lap top being used to do the IMMO Immobilizer Learn is inside the vehicle

it, could cause interference. Make sure the computer/lap top is outside the vehicle when performing the IMMO

Immobilizer Learn.

10. When performing an IMMO immobilizer learn, there are 6 di erent "Immobilizer System Component

Programming" functions to choose from listed in SPS/TLC, see example SI Document ID: 4430507. It is important

to read and select the most appropriate function when performing the IMMO immobilizer learn.

NOTE: On VIP vehicles, if the "Engine Control Module and Body Control Module IMMO Learn" function is

selected, it will invalidate all previously learned fobs and in most cases those fobs will not be able to be relearned

back to the vehicle. When this happens, the IMMO learn will indicate "0 fobs learned" and then ask if you would

like to program additional fobs and it will be stuck in this loop. In these cases, the original fobs will need to be

replaced with new fobs.

11. If a vehicle has other complaints, such as passive entry/start inoperative or no fob/key detected message,

then repair those issues rst. Even though the exterior or interior passive antennas are not used for the IMMO

immobilizer learn there has been some cases where an issue with one of these antennas has caused the IMMO

learn to fail. Below is a GDS2 screen shot of the BCM Keyless Entry Data List from a 2023 Tahoe. In this example,

the vehicle did have a complaint of the IMMO fob learn not completing/failing, but it also had a complaint of a no

fob detected message. When vehicle the GDS2 data it was found that one of the antennas was showing "Short to

Ground". After repairing this fault, the IMMO fob learn would now complete successfully.
Version History

Version

Modi ed
2

05/11/2023 - Created on.
03/22/2024 - Update model list and Correction sections
© 2024 General Motors. All Rights Reserved.

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