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NHTSA ID Number: 10090008
Manufacturer Communication Number: 15303
Summary
15303 – SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE FOR CERTAIN 2015 MODEL YEAR CHEVROLET TAHOE AND CHEVROLET SUBURBAN, GMC YUKON AND GMC YUKON XL 2WD VEHICLES EQUIPPED WITH AUTO LEVELLING REAR SUSPENSION (RPO Z85 AND AVF). THESE VEHICLES MAY HAVE AN AUTO-LEVELING FEATURE THAT IS INOPERATIVE. THE AUTO-LEVELING FEATURE WORKS BY SENSING WHEN THE REAR OF THE VEHICLE IS LOADED. REAR SHOCK ABSORBERS – INTEGRAL AIR SACKS (BOOTS) ARE INFLATED TO COMPENSATE AND LEVEL THE VEHICLE. CUSTOMERS MAY NOTICE THE REAR TRIM HEIGHT LOWER IN THE REAR OF THE VEHICLE WHEN LOADED COMPARABLE TO VEHICLES WITHOUT AUTO-LEVELING REAR SUSPENSION.
4 Affected Products
Vehicles
Parts
Absorber, Shock | 2 | 23458661 |
SEOCONTENT-START
Subject: | Auto-Leveling Rear Suspension Inoperative |
Models: | 2015 Chevrolet Suburban, Tahoe |
2015 GMC Yukon, Yukon XL | |
2WD Vehicles Equipped with Auto Leveling Rear Suspension | |
(RPO Z85 and AVF) |
Service procedure for 2015 model year Chevrolet Tahoe and Chevrolet Suburban, GMC Yukon and GMC Yukon XL 2WD vehicles equipped with auto levelling rear suspension (RPO Z85 and AVF).
These vehicles may have an auto-leveling feature that is inoperative. The auto-leveling feature works by sensing when the rear of the vehicle is loaded.
Rear shock absorbers’ integral air sacks (boots) are inflated to compensate and level the vehicle. Customers may notice the rear trim height lower in the rear of the vehicle when loaded comparable to vehicles without auto-leveling rear suspension.
Parts Information
Part Number | Description | Quantity/ Vehicle |
23458661 | Absorber, Shock | 2 |
Service Procedure
This procedure involves:
- Inspection of the rear auto leveling air shocks
- Reprogramming the Engine Control Module (ECM)
- Verification of the level control system function
- Replacement of both shocks in pairs, if necessary
Rear Shock Absorber Inspection
- Inspect the shocks while the vehicle is on the ground, or on a drive-on hoist, with the shocks loaded. Look for the air sacks being kinked, pinched, or trapped.
Air Sack Damage
Arrows point to trapped air sack between the shock body and the dirt shield. If this condition exists, the shock must be replaced. Inspect for rolling, folding, or any kinks in the rubber tube. Any shock with these conditions must be replaced.
- Raise and support the vehicle, with the rear axle unsupported to allow the rear shocks to extend.
- Inspect the lower roll of the air sack. Some “polishing” of the rubber (as seen in the picture below) is normal and ok.
If the sack exhibits any cracking, splitting, peeling, is darker than the surrounding rubber, or shows any spalling or material loss, it is damaged and must be replaced.

Air Sack Damage
Engine Control Module (ECM) Reprogramming
Reprogram the ECM with the latest calibration. Refer to K20 Engine Control Module: Programming and Setup.
System Pressure Check
To complete an Air Replenishment Cycle (ARC), the vehicle must have the engine running. For further information refer to Automatic Level Control Description and Operation (With Z85).
- Start the engine and listen for the ARC running the system air compressor for 3 seconds. Note ride height of vehicle adjusting.
- Ignition OFF.
- Raise and support the vehicle with the rear axle unsupported to allow the rear shocks to extend.

-
- Check System Pressure Check shock absorbers for system pressure. Shock “A” has no pressure, and displays a tapered “waist” just above the bottom roll of the boot. Shock “B” has the correct pressure with a nearly uniform width top to bottom.

-
- Air Sack Pressure Check Squeeze the air sack. The more firm the sack, the more pressure is present. If, after pressurizing the system the air sack is not holding pressure, it is damaged and must be replaced.
Rear Shock Absorber Replacement
For rear shock absorber replacement refer to Rear Leveling Shock Absorber
SEOCONTENT-END
GM Bulletin No.: 15303
Date: May 2015
To View or Download this Document Click Here
Reprogramming
GM Diagnostic/Programming (TIS2Web)
Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The following are the supported interface tools:
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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