PIP5853C

Bulletin No.: PIP5853C
Published date: 04/6/2023
Preliminary Information
PIP5853C TCCM Drivability DTCs and Possible Low Battery Charge
Models
Brand:
Chevrolet
Model:
Silverado 4500HD, 5500HD, 6500HD
Involved Region or
Country
Model Years:
2019 - 2023
VIN:
Engine:
from
to
All
All All
Transmissions:
All
North America
The vehicle may have a concern with the TCCM. causing DTC to set (see
below) and possible a discharged battery.
DTCs setting in the K69 Transfer Case Control Module:
C0396 SYM00 Range Actuator Position Sensor Circuit
P215A SYM5A Vehicle Speed Signal - Wheel Speed Signal Not
Plausible
U0121 SYM00 Loss communication with Brake Control Module
Condition
B0790 SYM00 Transfer Case Neutral Range Indicator Control Circuit
C0550 SYM00 Electronic Control Unit
C2A24 SYM00 Transfer Case Shift Pending Signal Not Plausible
P0606 SYM00 Control Module Processor Performance
C0398 SYM00 Range Actuator Position - Range Position Correlation
P279C SYM00 Transfer Case High or Low Range Detected In Neutral
Range
B2725 SYM00 Transfer Case Range Selection Switch Circuit
Cause
Possible low voltage or poor groung to the TCCM and/or internal diode
concern in the TCCM.
Correction:
There may also be a concern of a no shift with no DTC’S
When attempting an Actuator relearn there will be no noise heard from the actuator
In some instances, DTC C0398 may set following a failed re-learn attempt using either GDS2
or a manual relearn. During the GDS2 relearn an “Incorrect Power Mode” message may be
displayed
If this is found Inspect for ignition 1 voltage at the Transfer Case Control Module at
connector X4 terminal 25. It may be necessary to volt drop this circuit to see the low voltage
If there is no concern seen with the connections at the Transfer Case Control Module (K69)
then inspect for a spread or damaged terminal at the X61A IP Junction Block connector X4
Terminal 25
If a damaged terminal is found, please repair using the appropriate terminated lead
Also, there may be an issue at G110
This ground may be loose; however, it will feel tight due to the anti-corrosion paint that has
been applied. This paint will not only make the ground feel tight but will also seep behind the
ground and cause a poor connection
If no concern is seen with the ignition 1 voltage G110 should be removed and inspected for a
poor connection, for the presence of anti-corrosion paint behind the eyelet, or for a too long
bolt installed.
See the pictures below
If no issue is found there may be a diode issue internal to the Transfer Case Control Module
Diode
To test the diode follow the procedure below
Verify the TCCM internal diode function. With the TCCM connectors disconnected and the
key off, set multimeter to Diode Test Setting, Red lead to the X2-6 terminal and the Black
lead to the X2-4 terminal and record reading.
Next swap the leads red lead to X2-4 and Black lead to X2-6, record reading.
If both voltage readings are 1.65 +/- .33 volts.
There is no need to replace the TCCM if the voltages are 1.65+/- .33 volts
Clear the codes and return the vehicle to the customer
If one or both readings is below 1.32, replace TCCM and retest for fault code.
Engineering is looking into the concern, and information will be updated when obtained.
Note: Some of these codes can be set by multiple failed shift attempts with this transfer case;
we do need to have some movement. This could be as little as turning the steering wheel stop
to stop, for both 4 high and 4 low range. This transfer case does not use a synchronizer, it is a
gear to gear set up. Please refer to the following information from the Owner's Manual.
Per the Owner's
Manual:
Shifting Into 2 High from 4 High
The ignition must be on and the vehicle must be moving less than 16 km/h (10 mph).
Turn the knob to 2 m.
The indicator light will remain on the selected setting when the shift is complete.
If the vehicle is moving more than 16 km/h (10 mph), the indicator light will ash and the shift will not occur.
If the shift does not occur, turn the knob back to the original position and attempt the shift again.
Shifting Into 4 Low
The ignition must be on and the vehicle speed must be less than 4 km/h (3 mph) with the
transmission in N (Neutral).
Turn the knob to 4 n.
Wait for the 4 n indicator light to stop ashing before shifting the transmission into gear.
The indicator light will remain on the selected setting when the shift is complete.
If the vehicle is moving more than 4 km/h (3 mph), the indicator light will ash and the shift will not occur.
If the shift does not occur, turn the knob back to the original position and attempt the shift again.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
8486168*
Description
TCCM Drivability DTC's and Possible Low Battery Charge Diode test
*This is a unique Labor Operation for Bulletin use only.
Time
0.3 Hr.
Version History
Version
4
Modi ed
05/17/2022 - Created On.
07/27/2022 - Updated to correct labor operation
09/28/2022 - Updated to add additional information from owner’s manual
04/05/2023 - Updated to add additional diagnostic information
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