PI1519B

Bulletin No.: PI1519B
Date: Mar-2016
Subject:
Stop/Start System Malfunction or DTC P1064, P1065, P1066, P1068, P1069, P1070, P1074, P1077, P1078,
P1079, P107A, P107B, P107C, P107D, P107E, P107F, P108A, P108B, P108C, P108D, P108E or P108F Set
Models:
2016 Cadillac ATS, CTS
Equipped with Stop/Start System (RPO KL9)
Attention:
This PI also applies to any of the above models that may be Export vehicles.
This PI has been revised to add updated information to the Condition/Concern and Recommendation/Instructions. This PI
also supersedes PI1518A. Please discard PI1518A and PI1519A.
Condition/Concern
Some customers may comment that the check engine light appears on the cluster or that the Stop/Start feature is no longer functioning.
During diagnosis, the technician may find DTC P1064, P1065, P1066, P1068, P1069, P1070, P1074, P1077, P1078, P1079, P107A, P107B, P107C, P107D,
P107E, P107F, P108A, P108B, P108C, P108D, P108E or P108F set as current or history.
Recommendation/Instructions
Command the Discharge Start/Stop Capacitor parameter with the scan tool and discharge the multifunction energy storage capacitor. Wait 3 minutes for the
capacitor to discharge. Refer to Multifunction Energy Storage Capacitor Replacement (KL9) in SI.
When removing terminal G400 or G402 for inspection, the 12V battery ground terminal must be removed first to prevent any accidental discharge of the
UltraCap and/or discharge from the 12V battery when diagnosing the G400 or G402 ground connections.
Disconnect the 12V battery negative cable by removing the IBS sensor from the negative post of the battery.
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Check the G400 (3) or G402 (2) ground nut for proper torque and then inspect and remove any paint on the G402 ground stud. If no issues are found, continue
with Service Information (SI) diagnostics.
The Ultracapacitor is also known as the Multifunction Energy Storage Capacitor, or Stop-Start Capacitor.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
5430962
Ground Connection Repair
Use Published Labor
Operation Time
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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