PIT4915D

File in Section:
Service Bulletin
Bulletin No.:
Date:
PIT4915D
December, 2014
PRELIMINARY INFORMATION
Subject:
Normal Characteristic - Sub-woofer Is Inoperative With a 2.4L Engine With RPO UW6
Models:
2010 - 2015 Chevrolet Equinox
2010 - 2015 GMC Terrain
with 6 Speaker System (RPO UW6)
This PI was superseded to update Model Years. Please discard PIT4915C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some customers with a 2.4L engine and RPO UW6 may complain that their subwoofer is inoperative. Equinox and
Terrain models with a 4 cylinder engine are equipped with an Active Noise Cancellation (ANC) system - which works
to reduce the amount of noticeable noise at certain vehicle speeds. The ANC system works with the vehicle’s audio
system to create sound waves that cancel out torque converter clutch (TCC) noise.
Recommendation/Instructions
On a vehicle with a 2.4L and RPO UW6 which is a 6 speaker system, the subwoofer is only used for the Active Noise
Cancellation (ANC). This speaker is not used to play any audio from the any of the radio sources.
Note: Do NOT block the cargo area speaker for optimal ANC performance.
Customer Information
Please communicate to the customer this condition is a normal operating characteristic of their vehicle. It will not
impact the designed performance or reliability of the vehicle. Please share this information with the customer,
including a copy of this message.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.