Some 2020-2023 CT4, CT5, Corvette; 2021-2023 Envision, Escalade, Tahoe, Suburban, Yukon; and 2022 Silverado 1500 and Sierra 1500 models may have DTC P0606 (Control Module Processor Performance) set in the Body Control Module (BCM) along with an illuminated Check Engine MIL. There also may be performance concerns with the HVAC and lighting systems as well as several Driver Information Center messages displayed.
These conditions may be due to the BCM software or an incorrect BCM Program Flow Monitoring Status parameter. DTC P0606 will set if there is an internal malfunction or system programming malfunction in the BCM.
To review the parameters using GDS2, select the following path: Module Diagnostics > Body Control Module > Identification Information > Internal Control Module Performance Data. (Fig. 6) If the Program Flow Monitoring Status parameter is “active” and all other parameters are “inactive,” update the BCM with the latest calibration using SPS.
Fig. 6
After programming the BCM, or if the BCM was up to date, review the Program Flow Monitoring Status parameter again.
Program Flow Monitoring Status after BCM programming:
- If the Program Flow Monitoring Status parameter is still listed as “active” and all other parameters are listed as “inactive,” clear all codes. No other repairs are necessary. DTC P0606 may remain in the BCM. Do not replace the BCM. Additional information from GM Engineering will be released when available.
- If the Program Flow Monitoring Status parameter and all other parameters are listed as “inactive,” clear any codes. Repairs are complete.
- If the Program Flow Monitoring Status reads “active” or “inactive” while any other parameters read “active,” follow the diagnostic procedures for DTC P0606 in the appropriate Service Information.
Refer to #PIT5946 for additional information.
– Thanks to Paul Radzwilowicz
