Bulletin No.: PIT5556A
Published date: 03/24/2020

Preliminary Information
PIT5556A (Inspect Wiring Harness) Multiple Warning Lights /
Messages / High Speed Lan / Chassis Expansion Bus / Intermittent
Engine Stall at Stops / Service Power Steering / Service Stabilitrak /
Service Park Assist / Service Traction Control / Service Suspension
/ Service Trailer Brake Message / Shift to Park / PRNDL May Not
Display Gear
Product Investigation Review Required
Models
Brand:

Model:

Model Years:

VIN:
from

Engine:

to

Transmissions:

Cadillac

Escalade

2015 - 2017

All

All

All

All

Chevrolet

Tahoe

2015 - 2017

All

All

All

All

GMC

Yukon

2015 - 2017

All

All

All

All

Involved Region or
Country
Additional Options
(RPO)
Condition

North America and N.A. Export Regions
N/A
Some customers may comment on any of the following warning
messages and/or issues:
-

Intermittent Engine Stall at Stops
SES MIL
Service Power Steering/Reduced Power Steering Assist Message
Service Stabilitrak Message
Service Park Assist Message
Service Traction Control Message
Service Suspension System Message
Service Trailer Brake Message
Service Air Bag System
Shift to Park Message
PRNDL does not display current gear
Blown Fuses - F23UA, F24UA, F25UA, F36UA, and/or F74UA

When checking for DTC's the following may be set: C0045, C0050,
C0544, C0575, C0580, C0585, C0590, C0615, C0620, C0625, C0630,
C0660, C0696, C0710, C0711, C0712, C1112, C1113, C1114, C1115,
C1116, C1117, C1118, C111B, C0880, U0073, U0077, U0100, U0101,
U0102, U0104, U0121, U0126, U0128, U0131, U0139, U0140, U0151,
U017E, U023A, U026A, U026A, U0401, U0415, U0422, U0428, U0452,
U1505, U1556, U2099
These concerns will likely be intermittent and could be more
noticeable during the following situations: when getting in/out of
the vehicle, when loading items or passengers in the rear, while
stepping on rear cargo area, rocking the vehicle, under

moderate/hard braking, driving up/down an incline, or any
maneuvers when body/frame flexing may occur.
Cause

If the source of the issue(s) are not found after performing normal SI
diagnostics, they could be caused by a shorted chassis harness (3)
where it passes between the underbody floor structure and frame
cross member above the spare tire, as shown below. Depending on
which wire(s) are damaged will determine which vehicle system(s)
are affected: Communication Busses High Speed Lan/Chassis
Expansion, Electronic Suspension Control, Trailer Brake Control, etc.

The spare tire has been removed to access the area.
1. Spare Tire Hoist
2. Left Rear Frame Rail
3. Area of Shorted Harness

Correction:
Repair the affected wiring as needed. To provide more clearance between the wiring harness
and the frame / body, attempt to reshape or flatten the harness in the affected area so it is
more of an oval shape. Apply anti abrasion tape to help hold the shape, and, if needed,
add additional protection to the harness to prevent any damage from reoccurring.

Warranty Information
For wiring repairs covered under warranty, please refer to latest version of bulletin 10-00-89005.

Additional SI Keywords
parking

Version History
Version
Modi ed

2
12/13/2017 — Created on
03/24/2020 - Updated Condition

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