Faint High Pitched Whine Noise In Auto 4 Wheel Drive – 2014-2017 Chevrolet GMC Cadillac

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#PIP5261B: Faint High Pitched Whine Noise In Auto 4 Wheel Drive – (Feb 9, 2017)

Equipped with RPO NQH or NP0

Supersession Statement:

This PI was superseded to provide repair direction. Please discard PIP5261A.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern

Some customers may comment on a high pitched whine noise from the vehicle noticed when driving in auto 4wd.

The customer may comment that it is an intermittent noise and no noticeable pattern to when it can be heard.

Recommendation/Instructions

The transfer case control module on these vehicles is located next to the accelerator pedal and is not covered by any close out or hush panels.

When the transfer case control module has to move the transfer case actuator motor the higher current passing through the module causes an “electronic buzz or whine” within some of the capacitors in the module that can be heard by some of our customers.

The latest transfer case control module in service parts has provisions to eliminate this noise. Replace transfer case control module with current part number in the catalog. When programming the module ensure that the description for the calibration installed states the following “New software (Version 9.2) to address field issue of setting DTC C0398 while being driven in AUTO mode for 1 hour due to the IPS sensor drifting.”

Warranty Information

For vehicles repaired under warranty use:

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.

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