22NA034

Bulletin No.:
Service Bulletin
Date:
22-NA-034
February, 2022
INFORMATION
Subject:
Brand:
Chevrolet
EV Normal Characteristic – Traction Steer
Model:
Model Year:
VIN:
from
to
Bolt EV
2017
2022
Bolt EUV
2022
2022
from
to
—
—
Engine:
Transmission:
All
All
Involved Region or Country
North America, Brazil, Middle East, GM Korea Company
Condition
Some customers may comment that the vehicle pulls left/right under acceleration.
Cause
This condition may be due to one of the following causing the vehicle to pull left/right
under acceleration:
• Vehicle out of alignment
• Mismatched left versus right front tires
• Worn front suspension components
• Road conditions
• Traction Steer
Note: It may be very difficult to diagnose the actual root cause without having a detailed
conversation with the customer and/or road testing the vehicle.
Correction
If the customer describes the vehicle as always pulling in the same direction, excessive
torque steer may be present. Review Torque Steer and Torque Steer Description in SI.
Refer to Torque Steer in the Service Manual for additional details and also inspect for
worn front suspension or propulsion system mounting components before proceeding
with a vehicle alignment.
If the customer describes the pull as occurring both to the right and the left depending on
road traction conditions, the customer may be experiencing what is referred to as traction
steer. This is a result of the combination of high drive torque of the propulsion system and
front wheel drive platform. It is caused by unequal tractive forces at the two front tire
patches. These unequal forces are the result of slight wheel speed differences between
the front left and front right wheels during acceleration. The unequal wheel speeds cause
unequal torque output from the drive unit differential to the left and right drive axles due to
internal differential friction. The end result is the vehicle will pull toward the side with the
slightly higher wheel speed. The direction of the pull can change from side to side, and
sometimes change very quickly.
If the customer is experiencing Traction Steer, please advise them that this is normal
operating behavior of their vehicle under the specific conditions described above.
Leaving Traction Control on will usually help minimize traction steer disturbances, but
disturbances will still be noticeable under certain road / acceleration conditions.
Service Procedure
No repairs should be attempted for this Traction Steer
behavior. Performance and long-term durability are
NOT impacted.
Please communicate to the customer that the steering
system is functioning as designed and this is a normal
condition of their vehicle. Please share this information
with the customer, including a copy of this message.
Version
1
Modified
Released February 09, 2022
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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