Limited Vehicle Speed, Malfunction Indicator Lamp (MIL) Illuminated – DTC P07A7 – 2016-2018 Cadillac CT6 Plug-in

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Service Bulletin Bulletin No.: 19-NA-128
Date: December, 2020
TECHNICAL
Subject: Limited Vehicle Speed, Malfunction Indicator Lamp (MIL) Illuminated – DTC P07A7
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Cadillac CT6 Plug-in 2016 2018 — — 2.0L (LTG)
Automatic-
Hybrid
Electric (MRD)
Involved Region or Country North America, China
Additional Options (RPOs) Equipped with ELECTRIFIED PROPULS-ELECTRIC, PHEV, GEN 2, RWD (HP9)
Condition
Some customers may comment on one or more of the following conditions:
• MIL is illuminated
• Limited vehicle speed
Some technicians may find DTC P07A7 (Transmission Clutch 3 Stuck On) set in the
Hybrid Powertrain Control Module (HPCM).
Cause
5224678
This condition may be caused by the 1-3 clutch return spring ring (1) that has come
out of its groove, causing the Variable 1-4 and 1-3 Clutch Piston Return Spring Plate to
contact (2) the variable clutch plate assembly.
Page 2 December, 2020 Bulletin No.: 19-NA-128
Correction
Note: The addition of this C3 snap ring retainer will correct the condition and allow for
repair, in lieu of transmission replacement.
Engineering has designed a snap ring retainer that will stop the snap ring from rotating,
which keeps it securely in its designed groove.
⇒ The C3 clutch assembly must be disassembled, replacing both the clutch
pack and the snap ring as well as adding the new snap ring retainer.
Service Procedure
Refer to Variable 1-2-3-4 and 1-2-3 Clutch Disassemble
in SI.
5224585
Important: During assembly, position the 1-3 clutch
return spring ring, as shown in the above picture, to aid
in retainer installation.
Parts Information
Causal
Part
Description Part
Number
Qty
X RETAINER, VAR
1-4 & 1-3 CLU
SNP RNG
24298424 1
X GASKET, A/
TRNS TORQ
DPNR HSG
24268461 1
X PLATE SET, VAR
1-4 & 1-3 CLU
24268430 1
X SEAL, A/TRNS
TORQ DPNR
24266675 1
Causal
Part
Description Part
Number
Qty
X RING, A/TRNS
TORQ DPNR
FLUID SEAL RET
24257281 1
X RING, VAR 1-4 &
1-3 CLU
RTN SPR
24256243 1
X RING, VAR 1-4 &
1-3 CLU BKG
LKT RET
24253178 1
X FLUID, A/TRANS
(DEXRON HP)
(1QT/0.946
LITRES)
Refer
to EPC
10 QT (9.5
Liters)
Bulletin No.: 19-NA-128 December, 2020 Page 3
Warranty Information
For submitting this repair under the Hybrid Component
Limited Warranty coverage, use the following Labor
Operation. Reference the Applicable Warranties
section of Investigate Vehicle History (IVH) for
coverage information.
Labor
Operation
Description Labor Time
8480828* C3 Snap Ring Retainer
Installation 8.5 hrs
*This is a unique Labor Operation for bulletin use only.
Version 2
Modified
Released June 07, 2019
December 16, 2020 – Changed the Warranty Information coverage statement to Hybrid
Component Limited Warranty coverage.

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