Engineering Information – Transmission Performance Issues without a Current or History DTC and Unable to Duplicate the Customer Concern (CCND) – 2020 Chevrolet Silverado & GMC Sierra

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Subject: Engineering Information – Transmission Performance Issues without a Current or History DTC and Unable to Duplicate
the Customer Concern (CCND)
This PI has been revised to end the need for information from the field. Please discard PIE0583A.
Brand: Model: Model Year: VIN: Engine: Transmission:
from to from to
Chevrolet Silverado 2500/3500 HD 2020 2020 – – Equipped with
6.6L Engine
(RPO L5P)
Equipped with 10 SPD
Transmission (RPOs
GMC Sierra 2500/3500 HD MGM, MGU)
If you encounter a vehicle with the above condition, refer to SI for further diagnosis.
Version 3
Modified Released September 09, 2020
Revised October 01, 2020 – Revised to update the Subject, Condition and Contact Information.
Revised November 18, 2020 – Ended the need for further information from the field.
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Subject: Engineering Information – Transmission Performance Issues without a Current or History DTC and Unable to Duplicate
the Customer Concern (CCND)
This EI has been revised to update the Subject Condition and Contact Information. Please discard PIE0583.
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 PIE and proceed with diagnostics found in published
service information. THIS IS NOT A RECALL — refer to Service Bulletin 04-00-89-053 for more details on the use of
Engineering Information bulletins.
Brand: Model: Model Year: VIN: Engine: Transmission:
from to from to
Chevrolet Silverado 2500/3500 HD 2020 2020 – – Equipped with
6.6L Engine
(RPO L5P)
Equipped with 10 SPD
Transmission (RPOs
GMC Sierra 2500/3500 HD MGM, MGU)
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 one or more of the following transmission performance conditions. After
evaluation you may find the Customer Concern Not Duplicated (CCND).
• Shifting early
• Shifting late
• Harsh shift
• Slipping
• Transmission Noise
Cause 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.
Correction
If you encounter a vehicle with the above concern, complete the survey below and contact one of the engineers listed below as General Motors Engineering is
attempting to collect transmission related Customer Concern Not Duplicated (CCND) data in an effort to improve vehicle quality and the ownership experience.
Check all that apply:
1. Driving Mode when issue occurs (Check all that apply)
___ Tow Haul
___ Manual
2. Exhaust Brake Active (HD Only) (Check one)
___ Yes
___ No
3. Does issue occur when towing or loaded only (Check one)
___ Yes
___ No
3.1. If Yes, estimated trailer / load weight (lbs)If Yes, estimated trailer / load weight (lbs) (Check all that apply)
___ 0 – 1000
___ 1000 – 3000
___ 3000 – 6000
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___ 6000 – 10000
___ 10000+
4. Shift Type (Check all that apply)
___ Range Change
___ Upshift
___ Downshift
5. Pedal position (Check all that apply)
___ Off
___ Light
___ Medium
___ Heavy
5.1. If on pedal, Acclerator Pedal Rate (Check all that apply)
___ Steady
___ Increasing
___ Decreasing
5.1. If off pedal, Brake Pedal position (Check all that apply)
___ Light
___ Moderate
___ Heavy
6. Cruise Control Active (Check one)
___ Yes
___ No
7. If Noise, please identify (Check all that apply)
___ Whine
___ Rattle
___ Groan
___ Buzz
___ Clunk
___ Slam
8. If Issue occurs outside of shift please identify (Check all that apply)
___ Surge
___ Shudder
___ Vibration
___ Bump
___ Tie Up
___ Flare / Slipping
9. If Shift Complaint, please identify (Check all that apply)
___ Harsh
___ Delayed
___ Shifts Early
___ Shifts Late
___ Shifts to Wrong Gear
___ Shifts to Wrong Range
10. Complaint Upshift (Check all that apply)
___ 12
___ 23
___ 34
___ 45
___ 56
___ 67
___ 78
___ 89
2
___ 910
___ Other
___ Unkown
11. Complaint Downshift (Check all that apply)
___ 109
___ 98
___ 87
___ 76
___ 65
___ 54
___ 43
___ 32
___ 21
___ Other
___ Unkown
12. Complaint Range Change (Check all that apply)
___ Key Up
___ Park to Drive
___ Park to Reverse
___ Reverse to Drive
___ Drive to Reverse
___ Drive to Park
___ Reverse to Park
___ Key Off
13. Vehicle Speed Range (MPH) (Check all that apply)
___ 0-10
___ 10-20
___ 20-30
___ 30-40
___ 40-50
___ 50-60
___ 60-70
___ 60-70
14. Engine RPM Range (Check all that apply)
___ 0-500
___ 500-1000
___ 1000-1500
___ 1500-2000
___ 2000-3000
___ 3000-4000
___ 4000+
15. Time Since Startup (Minutes) (Check all that apply)
___ 0-2
___ 2-5
___ 5-10
___ 10-20
___ 20+
16. Time Since Last Key Down (Hours) (Check all that apply)
___ 0-1
___ 1-3
___ 3-6
___ 6-12
___ 12+
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17. Frequency of issue during drive cycle (Check one)
___ Less than once
___ Once
___ Multiple
___ Frequent
18. Is issue still occurring (Check one)
___ Yes
___ No
18.1. If no, mileage when issue stopped
____________
Contact Information
The preferable method of contact is email. Please include the following information when emailing:
– Technician name and phone number
– Dealer name
– Complete VIN and repair order (R.O) number
– Mileage
– Completed Survey
– Any Current or History DTC’s
– Any recorded GDS sessions that may have been captured.
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
8481078* Engineering Information – Early, Late, Harsh and/or Slip Type Transmission
Performance
0.3 hr
* This is a unique labor operation for bulletin use only.
Version 2
Modified Released September 09, 2020
Revised October 01, 2020 – Revised to update the Subject, Condition and Contact Information.
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The Contact Information has been redacted.

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