C0398 on the 2015 Cadillac Escalade
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| PIP5250E | 2018-06-04. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a Service 4WD message on the Driver Information Center when operated below 10 degrees Fahrenheit (-12 Celsius). Technician may find C0398 or C0326 stored in the Transfer Case Control Module. For vehicles with Regular Production Option Code NQH and NQ6 and only setting Diagnostic Trouble Codes C0398 or C0398 and C0326 the replacement of the actuator motor will correct the concern. Dealer will need to contact General Motors Product Quality Center for further assistance. For vehicles with Regular Production Option Code NQH and NQ6 with other transfer case Diagnostic Trouble Codes. If the vehicle had a Diagnostic Trouble Code C0398 in the transfer case control module stored with any other codes such as C0392, C0396, C0306 or other codes related to rotational position sensor or actuator position sensor it is likely that is causing a C0398 to set and replacement of the actuator will likely not repair the vehicle. For vehicles with Regular Production Option Code NP0 and only have a Diagnostic Trouble Code C0398 stored in the transfer case control module, the technician should insure the transfer case control module calibrations are up-to-date in Tis2Web. |
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| PIP5250D | 2018-06-04. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a Service 4WD message on the Driver Information Center when operated below 10 degrees Fahrenheit (-12 Celsius). Technician may find C0398 or C0326 stored in the Transfer Case Control Module. For vehicles with Regular Production Option Code NQH and NQ6 and only setting Diagnostic Trouble Codes C0398 or C0398 and C0326 the replacement of the actuator motor will correct the concern. Dealer will need to contact General Motors Product Quality Center for further assistance. For vehicles with Regular Production Option Code NQH and NQ6 with other transfer case Diagnostic Trouble Codes. If the vehicle had a Diagnostic Trouble Code C0398 in the transfer case control module stored with any other codes such as C0392, C0396, C0306 or other codes related to rotational position sensor or actuator position sensor it is likely that is causing a C0398 to set and replacement of the actuator will likely not repair the vehicle. For vehicles with Regular Production Option Code NP0 and only have a Diagnostic Trouble Code C0398 stored in the transfer case control module, the technician should insure the transfer case control module calibrations are up-to-date in Tis2Web. |
| PIP5250C | 2018-06-04. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a Service 4WD message on the Driver Information Center when operated below 10 degrees Fahrenheit (-12 Celsius). Technician may find C0398 or C0326 stored in the Transfer Case Control Module. For vehicles with Regular Production Option Code NQH and NQ6 and only setting Diagnostic Trouble Codes C0398 or C0398 and C0326 the replacement of the actuator motor will correct the concern. Dealer will need to contact General Motors Product Quality Center for further assistance. |
| PIP5220B | 2018-05-07. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a repeat service 4 wheel drive message. Technician may find Diagnostic Trouble Codes C0398, C038D or C0397. Technician will need to reprogram the Transfer case control module with latest software available through tis2web. If the vehicle has Regular Production Option Code (NQH) and has a Diagnostic Trouble Code C0398 setting after being Dinghy towed please see the latest version of PIP5217. If the vehicle has a Diagnostic Trouble Code C0398, inspect circuits 7477, 7478, 7479 for any terminal or connection issues between the B2227 Gear Position Sensor and the Transfer Case Control Module and repair as needed. |
| PIP5250G | 2018-01-22. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a Service 4WD message on the Driver Information Center when operated below 10 degrees Fahrenheit (-12 Celsius). Technician may find C0398 or C0326 stored in the Transfer Case Control Module. For vehicles with Regular Production Option Code NPO, NQH and NQ6 and only setting Diagnostic Trouble Codes C0398 or C0398 and C0326 reprogram the transfer case control module with the latest calibration from TIS2WEB and perform the setup procedure. |
| GCUS-9-286 | 2017-11-17. Service bulletin. 15304 - Service Update. This bulletin provides a service procedure to reprogram the transfer case control module on the vehicles listed above. In low ambient temperatures, below 5°F (-15°C) a transfer case brake motor assembly malfunction may occur. Diagnostic Trouble Code (C0398 - Range Position Correlation Fault) will be set, locking the transfer case in ?4HI? until the vehicle is serviced. This software update also addresses other transfer case control issues for overall improved drivability. |
| PIP5250F | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a Service 4WD message on the Driver Information Center when operated below 10 degrees Fahrenheit (-12 Celsius). Technician may find C0398 or C0326 stored in the Transfer Case Control Module. For vehicles with Regular Production Option Code NQH and NQ6 and only setting Diagnostic Trouble Codes C0398 or C0398 and C0326 the replacement of the actuator motor will correct the concern. Dealer will need to contact General Motors Product Quality Center for further assistance. For vehicles with Regular Production Option Code NQH and NQ6 with other transfer case Diagnostic Trouble Codes. If the vehicle had a Diagnostic Trouble Code C0398 in the transfer case control module stored with any other codes such as C0392, C0396, C0306 or other codes related to rotational position sensor or actuator position sensor it is likely that is causing a C0398 to set and replacement of the actuator will likely not repair the vehicle. For vehicles with Regular Production Option Code NP0 and only have a Diagnostic Trouble Code C0398 stored in the transfer case control module, the technician should insure the transfer case control module calibrations are up-to-date in Tis2Web. |
| PIP5250B | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have Service 4WD message in the Driver Information Center. During inspection technician may find Diagnostic Trouble Code C0398 or C0326 stored in the Transfer Case Control Module. If the vehicle has Regular Production Option Code NP0 and only has diagnostic trouble code C0398 stored in the Transfer Case Control Module, then use Service Programming System to update the Transfer Case Control Module. When working with vehicles equipped NHQ and NQ6 and setting Diagnostic Trouble Code C0398 when operated in areas where the ambient temperature is below 32 Fahrenheit (0 Celsius) use Global Diagnostic System 2 to review the freeze frame failure records, record all findings and Diagnostic Trouble Codes then clear the DTCs and data. Technician will need to operate the vehicle in all ranges and ensure that no Diagnostic Trouble Codes reset. If the vehicle had a Diagnostic Trouble Code C0398 in the Transfer Case Control Module stored with any other Diagnostic Trouble Code such as C0392, C0396, C0306 or other codes related to rotational position sensor or actuator position sensor it is likely that is causing a C0398 to set and replacement of the actuator will likely not repair the vehicle. If no Diagnostic Trouble Codes reset and C0398 was set without other rotational position sensor, or actuator position sensor Diagnostic Trouble Codes then replace the actuator motor with part number 23355888. Dealer will need to contact General Motors Product Quality Center for further assistance. |
| PIP5217B | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a service 4 wheel drive message and the transfer case is stuck in neutral. Technician may find Diagnostic Trouble Code C0398 set in the Transfer Case Control Module. Technician should verify if the vehicle was dinghy towed the vehicle using the owner’s manual procedure. If the vehicle has a C0398 after this type of procedure then performing SUB15304 will correct the condition. |
| PIP5220A | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that may have a repeat service 4 wheel drive message. Technician may find Diagnostic Trouble Codes C0398, C038D or C0397. Technician will need to reprogram the Transfer case control module with latest software available through tis2web. If the vehicle has Regular Production Option Code (NQH) and has a Diagnostic Trouble Code C0398 setting after being Dinghy towed please see the latest version of PIP5217. If the vehicle has a Diagnostic Trouble Code C0398, inspect circuits 7477, 7478, 7479 for any terminal or connection issues between the B2227 Gear Position Sensor and the Transfer Case Control Module and repair as needed. |
13 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.