TCCM Drivability DTCs and Possible Low Battery Charge – 2019-2023 Chevrolet Silverado 4500 HD, 5500HD, 6500HD

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Bulletin No.: PIP5853B Published date: 09/29/2022 Preliminary Information IP5853B TCCM Drivability DTCs and Possible Low Battery Charge odels Brand: Chevrolet Model: Silverado 4500 HD, 5500HD, 6500HD Model Years: 2019 – 2023 VIN: from to All All Engine: All Transmissions: All Involved Region or Country North America Condition 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: C0396/00 Range Actuator Position Sensor Circuit P215A/5A Vehicle Speed Signal – Wheel Speed Signal Not Plausible U0121/00 Loss communication with Brake Control Module B0790/00 Transfer Case Neutral Range Indicator Control Circuit C0550/00 Electronic Control Unit C2A24/00 Transfer Case Shift Pending Signal Not Plausible P0606/00 Control Module Processor Performance C0398/00 Range Actuator Position – Range Position Correlation P279C/00 Transfer Case High or Low Range Detected In Neutral Range B2725/00 Transfer Case Range Selection Switch Circuit Cause Possible internal diode concern in the TCCM. Correction: 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. 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 flash 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 flashing 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 flash 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 Description Time 8486168* TCCM Drivability DTC’s and Possible Low Battery Charge Diode test 0.3 Hr. *This is a unique Labor Operation for Bulletin use only. Version History Version 3 05/17/2022 – Created On. 07/27/2022 – Updated to correct labor operation Modified 09/28/2022 – Updated to add additional information from owner’s manual © 2022 General Motors. All Rights Reserved.

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