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NHTSA ID Number: 10205579
Manufacturer Communication Number: 21NA259
Summary
This service bulletin provides diagnostic information to correct customer concerns of Speed Limited Message or Reduced Propulsion Power Message Displayed on Driver Information Center (DIC) with no DTCs Set.
4 Affected Products
Vehicle
MAKE | MODEL | YEAR |
CHEVROLET | VOLT | 2016-2019 |
Condition
Some customers may comment on one or more of the following messages displayed on the DIC:
• Speed Limited to (X) mph
• Reduced Propulsion Power
– When the message disappears, full propulsion power is restored.
Technicians may find no DTCs stored or may not be able to duplicate the customers
concern.
Cause
This could be caused by low transmission fluid.
Correction
Inspect for transmission fluid leaks and verify fluid level. Due to the sensitive and complex nature of this drive unit:
• If the fluid level is low, it may cause the conditions described above.
• If fluid level is low or a leak is found, follow the outlined procedure in SI to complete the repair.
• If no fluid leak is found and fluid level is full, review the Pack Capacity and compare the vehicle Battery Pack Capacity to what is published in Hybrid/EV High Voltage Battery Reduced Range Analysis document in SI.
Ensure the vehicle is getting occasional full charging. This is how the HPCM2 evaluates the battery.
After an extended period of time of not receiving a full charge may result in:
– A less accurate battery capacity estimation.
– Limiting power from the battery under certain conditions while the engine is running.
SEOCONTENT-START
Service Bulletin Bulletin No.: 21-NA-259
Date: November, 2021
INFORMATION
Subject: Diagnostic Tip on Speed Limited Message or Reduced Propulsion Power Message
Displayed on Driver Information Center (DIC) with no DTCs Set
This bulletin replaces PIC6428. Please discard PIC6428.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Volt 2016 2019 All All All All
Involved Region or Country North America
Condition
Some customers may comment on one or more of the following messages displayed on
the DIC:
• Speed Limited to (X) mph
• Reduced Propulsion Power
– When the message disappears, full propulsion power is restored.
Technicians may find no DTCs stored or may not be able to duplicate the customers
concern.
Cause This could be caused by low transmission fluid.
Correction
Inspect for transmission fluid leaks and verify fluid level. Due to the sensitive and
complex nature of this drive unit:
• If the fluid level is low, it may cause the conditions described above.
• If fluid level is low or a leak is found, follow the outlined procedure in SI to complete
the repair.
• If no fluid leak is found and fluid level is full, review the Pack Capacity and compare
the vehicle Battery Pack Capacity to what is published in Hybrid/EV High Voltage
Battery Reduced Range Analysis document in SI.
Ensure the vehicle is getting occasional full charging. This is how the HPCM2 evaluates
the battery.
After an extended period of time of not receiving a full charge may result in:
– A less accurate battery capacity estimation.
– Limiting power from the battery under certain conditions while the engine is running.
Version 1
Modified Released November 09, 2021
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-259
Date: November, 2021
https://www.nhtsa.gov/recalls?nhtsaId=10205579
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Last update on 2024-04-16 / Affiliate links / Images from Amazon Product Advertising API
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