6/23/2021 SS 3U/8-F 1L2UZ1 New Cascadia No Start and or Stalk... - VINA Solutions

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SS 3078-FTL2021 New Cascadia No Start and or
Stalk Switch Shift Lever Right Active Fault(s) [aa

Applicable Vehicles

The solution applies to New Cascadia vehicles built from 1/1/2020 with Detroit
Engines and DT12 transmissions.

Symptoms
No engine crank and or fault codes 0/521006/14 and 33/520848/31 being active.

Issue

New Cascadia vehicles built since 1/1/2020, have seen an increase of the stalk switch lever right
being replaced. Stalk switches returned for testing, have tested good. In most of the warranty
claims filed for stalk switch right replacement, both of the fault codes below appear to be
present. Stalk switch lever right controls both shifting and engine brake functions. Engine not
cranking, can occur if neutral signal is not detected from the transmission.

¢ CPC5 SA 0 SPN 521006 FMI 14—CPC shift Stalk Lever Position Not Plausible - Note:
current troubleshooting for this code states to replace the stalk switch. Efforts to update
the troubleshooting for this code, to provide better guidance, are being made.
¢ sSAM SA 33 SPN 520848 FMI 31—SSAM Stalk Switch Right Error - This code generates if
one of the three conditions exist.
e 1. Faulty wire/harness.
¢ 2. Faulty or corroded connector
e 3. Stalk Switch Right device failure

While continuing to investigate root cause(s), several factors can attribute to the fault codes
listed above becoming active. It is always important to look at all fault codes prior to
troubleshooting any system.

6/23/2021 SS 3U/8-F 1L2UZ1 New Cascadia No Start and or Stalk... - VINA Solutions

In investigating reported issues from the field, there appears to be three separate conditions
that can attribute to the fault codes listed above becoming active.

1. If other fault codes such as the following are also active, they can be an indication of a
failed sub-bus and should be trouble shot first, as they are most like likely the root cause.
1. sSAM 33/520880/13-subbus switch missing (if all switch are missing, this is an
indication that subbus is not communicating).
2.MPC 127/524049/19—DTC Camera MSF Data Error (code generates when the MPC
cannot see the turn signal switch or LDW switch)

2. SSAM requires a good power and ground connection to function properly. If power or
ground connections is compromised, or voltage drops occur between the sSAM and the
power and ground sources, then sSAM function can be affected.

3. Faulty wire / harness and or poor connections of wiring going to the stalk switch right.
Typically, when this occurs both left and right stalk switches do not function. There is
always a chance that a failed right stalk switch could be the failure, but typically, when this
occurs only the right stalk switch does not function.

Reports from the field also state that sometimes the codes is eliminated by just cycling the
ignition switch off and letting all of the modules go to sleep and then powering the ignition back
on. In other cases, vehicles with disconnect switches are cycled off for about 15 seconds and
then turned back on while the ignition is off and this too appears to clear the codes. Customers
have performed these actions to get vehicles going when a no crank condition occurs and the
two codes are active. In many cases, the field also reports that after performing the actions
above, the codes do not return. The solution below provides guidance, in hopes of eliminating
all of the above conditions and codes.

Solution

When troubleshooting for a “no crank” condition and or fault codes 0/521006/14 and
33/520848/31 are active, first check and see if any other codes are active.

1. If fault codes 33/520880/13 is active and when accessing the MSF Subbus switches
template all of the subbus switches are showing missing, then that is a good indication
that the problem is related to the subbus or a subbus switch. This condition would result
in all subbus switches not functioning and the two fault codes 0/521006/14 and
33/520848/31 becoming active. Several conditions can attribute to this kind of failure.

1. Metallic material form drilling or cutting of panels when aftermarket systems are
added

2. Poor connections or failed switches

3. Subbus wires being pinched, chaffed and or shorted

6/23/2021 SS 3U/8-F 1L2UZ1 New Cascadia No Start and or Stalk... - VINA Solutions

Wiring for the subbus switches is found in module 860. Since the subbus can have many
jumpers, slave modules and switches in the circuit, the best way to isolate the problem is to
unplug modules, jumpers and if needed switches to isolate where the problem exists. For more
details on trouble shooting the subbus, see Service Solution 1034544 for information including
troubleshooting for fault code Fault 520197/31- MQ Switch Malfunction, if present.

Subbus wiring example (per S/N schematics from module 860 should be used for
troubleshooting)

Aw

pas | FLOOR
(woo 320) { (MoD 267)

2. Poor power and or ground to the sSAM can result in erratic or non-functioning features of the
sSAM. It is important when running into intermittent or erratically operating systems, that the
sSAM be checked and validated for good power and ground supply. Blown fuses, poor
connections and damaged wiring are just a few conditions that can result in the sSAM not
receiving the correct system voltage to properly function. To ensure proper power and grounds
is being supplied to the sSAM, reference Service Solution 1034348 under the sections labeled
“Prior to running voltage drop tests, inspect the power and ground cables to the sSAM" for
inspection and cleaning of the ground and power cables, along with “Running voltage drop tests
on the two power and ground cables going to the SSAM" that ensures no voltage drops are
present.

6/23/2021 SS 3U/8-F 1L2UZ1 New Cascadia No Start and or Stalk... - VINA Solutions

The figure below is a reference of the power supply path to the SSAM. Reference the figure
when tracing out voltage drops if needed.

EXTERIOR FRONT Watt —_INTERIOR

BCA Outside BCA Inside

| | |
MGIB Outside’ | Ground Frontwall Pass-through Stud

Ground Frontwall
Pass-through Stud

3. Faulty wire / harness and or poor connections of wiring going to the stalk switch right can
also result in fault codes 0/521006/14 and 33/520848/31 becoming active. Typically, when this
occurs both left and right stalk switches do not function. Below is the LIN wiring for stalk
switches. If only these codes are active then insure the wiring between the sSAM and the stalk
switch has continuity and no shorts and open are present. Also validate that power and ground
is present at the stalk switches. If all of the wiring and connections are good and only the right
stalk switch is still not functioning, then the right stalk switch has most likely failed.

Lin wiring example for stalk switch (per S/N schematic from module 54C should be used for
troubleshooting)