Subject:

Engineering Information – Intermittent No Forward and/or No Reverse While Driving

Attention:

Proceed with this EI ONLY if the customer has commented about this concern AND the PIE number is
listed in the Global Warranty Management / Investigate History link (GWM/IVH). If the customer has not
commented about this condition or the EI does not show in GWM/IVH, disregard the PI and proceed
with diagnostics found in published service information. THIS IS NOT A RECALL — refer to the latest
version of Service Bulletin 04-00-89-053 for more details on the use of Engineering Information
bulletins.

Brand:

Cadillac

Model:

Model Year:

VIN:

from

to

from

to

Escalade Models

2015

2017

-

-

ATS

2017

2019

Engine:

Transmission:

-

Equipped with
Automatic
Transmission
(RPO M5U)

CTS

Chevrolet

CT6

2018

Equipped with
Automatic
Transmission
(RPO M5X)

Camaro

2019

Equipped with
Automatic
Transmission
(RPO M5U)

Corvette
Express

GMC

Silverado

2017

2018

Silverado 1500
(New Model)

2019

2019

Equipped with
Automatic
Transmission
(RPO MQE)

Savana

2015

2019

Equipped with
Automatic
Transmission
(RPO M5U)

Sierra

2018

Yukon Models

2017

Sierra 1500 (New
Model)

2019

2019

Equipped with
Automatic
Transmission
(RPO MQE)

Involved Region or Country

North America

Condition

Important: If the customer did not bring their vehicle in for this concern, DO NOT proceed with this EI.
Some customers may comment on intermittent no forward and/or no Reverse while driving.

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GM Engineering is attempting to determine the root cause of the above condition. Engineering has a need to
gather information on vehicles PRIOR to repair that may exhibit this condition. As a result, this information will be
used to "root cause" the customer's concern and develop/validate a field fix.

Cause

Correction
If you encounter a vehicle with the above concern, BEFORE answering the questions below and contacting the engineers listed with your findings, remove the
transmission oil pan and inspect for nickel to quarter size pieces of aluminum debris in the oil pan. The 2-3-4-6-8 and 4-5-6-7-8 reverse clutch assembly and the 1-3-56-7 clutch assembly may be broken in several pieces.
1.

Check and record all DTCs in all modules.
Important: DO NOT clear any DTCs or disconnect the battery.

2.

Were you experiencing any transmission performance concerns before the loss of Drive and/or Reverse?

3.

Has there been any previous DTCs?

4.

What type of driving (city, stop and go, highway) were you doing before you experienced the loss of Drive and/or Reverse?

5.

What was the outside ambient temperature?

6.

How long had the vehicle been running/driving (time and mileage)?

7.

What was the approximate vehicle speed?

8.

Were you accelerating or decelerating?

9.

Were you traveling up hill, down hill or on a flat road surface?

10. Were you using the manual shift mode?
11. What range was the transfer case in at the time of failure?
12. Was the shift lever moved just prior to the loss of propulsion condition?

Contact Information
Engineer Name

Phone Number

Martin Hefter

734-320-8635

Russ Maki

248-249-9452

Please include the following information if leaving a message:
–

Technician name

–

Dealer name and phone number

–

Complete VIN and repair order (R.O) number

On the repair order, document the date and time the call was placed (even if the engineer was not reached).
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information found in SI.

Warranty Information
If engineer was contacted or required information was provided, use:
Labor Operation

Description

Labor Time

8480878*

Engineering Information – Intermittent No Forward and/or No Reverse While
Driving

0.4 hr

*This is a unique Labor Operation for Bulletin use only.

Version

1

Modified

Released August 06, 2019

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