PIT5888B

Bulletin No.: PIT5888B
Published date: 10/26/2022
Preliminary Information
PIT5888B Air Leveling Suspension Is Low After An Overnight Soak
In Very Cold Temperatures
Product Investigation Review Required
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Cadillac
Escalade Models
2021 - 2022
SOP
December 1, 2021
All
All
Chevrolet
Suburban
2021 - 2022
SOP
December 1, 2021
All
All
Chevrolet
Tahoe
2021 - 2022
SOP
December 1, 2021
All
All
GMC
Yukon Models
2021 - 2022
SOP
December 1, 2021
All
All
Involved Region or Country North America
Additional Options (RPO)
Condition
F47 - Air Leveling Suspension
Some customers may report that following an overnight cold soak, in temperatures
below 0 Degs F (-15 Degs C), that the front air springs have leaked down resulting in
severe suspension sag. A "Service Air Leveling System" message may be present on
the driver information center (DIC) accompanied with DTC C118B and/or C118C.
Note: This condition is not known to manifest itself in ambient temperatures
warmer than 0 Degs F or -15 Degs C.
Cause
Air spring to upper mount crimp ring.
Correction:
Note: Do not drive the vehicle if the air springs have no pressure as this can damage them to the point that they
will require replacement.
- Perform normal air leak diagnostics and verify all air line connections are fully seated. Repair any leaks that are
found and reevaluate.
- If no root cause is found, engineering has found air may leak around the area of the upper air spring to upper
mount crimp, which only occurs in very cold temperatures. To correct this concern, replace both front air
springs. Follow SI "Shock Absorber, Shock Absorber Component, or Spring Replacement - (F47)" for the air spring
replacement procedure. During this repair, the air spring seals must be replaced and the seals come as a kit (1),
shown below. The seal kit will contain seals for the air spring itself and two additional o-rings (4) that are used for
the shock spring seat (3), see below. These two additional o-rings should also be replaced during the air spring
replacement.
After the new air spring and seal kit is installed, use the CH-52667 Air Spring In ator to ll the air spring to 4 bar
(60 psi), before installing the assembly on the vehicle. It is very important to make sure the air spring has in ated
correctly. The easiest way to verify this is with the corrugated boot removed visually inspect the lower portion of
the air spring to make sure it is uniform all the way around (5), as shown below. If the spring did not ll correctly
it will need to be de ated and then re in ated. To aid in proper in ation make sure the air spring assembly is
held vertically and fully extended while in ating the air spring.
Parts Information
Part Number
85521597
85521598
85546609
Description
Air Spring with RPO 6WL and 7WL
Air Spring with RPO 6WM and 7WM
Seal Kit - All
Qty
2
2
2
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
*8080668
Description
Replace Both Front Air Springs With Seal Kits
* This is a unique Labor Operation for bulletin use only.
Additional SI Keywords
level, spring
Version History
Labor Time
2.4 Hrs.
Version
Modi ed
3
01/28/2022 - Created on.
03/09/2022 - Update to the Models, Condition, Cause, Correction, Parts and
Warranty sections.
10/26/2022 - Update to the Model years.
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