Service bulletin 08-074-25 REV. D

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

RSU With Additional Sleep Cycles for HV Battery Integrity Check - Flash: Electronic Vehicle Control Unit (EVCU) Updates 11B3 Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **B12B4-00 - Charge Status Indicator Module Internal.** ● C10FA-00 - Wheel Hub disconnect Actuator Performance Left. ● C10FB-00 - Wheel Hub disconnect Actuator Performance Right. ● C10F8-00 - Left Front Wheel Hub Disconnect Actuator Position Sensor Circuit Range/Performance. ● C10F9-00 - Right Front Wheel Hub Disconnect Actuator Position Sensor Circuit Range/Performance. ● P061B-00 - Internal Control Module Torque Calculation Performance. Customers may also comment on one or more of the following: ● **Will not be able to start the vehicle. ● 12V battery dead resulting in no start. ● Improvements to minimize occurrences of Limp Home Mode (Turtle Mode). ● Loss of communication between EVCU and the Battery Pack Control Module (BPCM) can prevent high- voltage contactors from closing, resulting in a no-start condition. ● Remote start functionality fails when the vehicle is actively charging. ● "Charge Now" feature in application has multiple issues. Feature intermittently fails and does not close contactors, sometimes starts but charge port indicator lights are not commanded by EVCU and sets DTC B12B4-00. ● Closed loop 12V silent charging which can help mitigate the 12V drain issue on the vehicle. ● Drive-by-brake improvements and a resolved issue where the vehicle incorrectly enters turtle mode while driving. ● Powershot sometimes stuck at 0 seconds remaining which makes customer believe that Powershot is not working. ● Wheel End Disconnect closure at zero speed in case of miss at normal close speed. ● Drive-by-brake message update to Instrument Panel Cluster (IPC) in case of Limp Home mode.** ● Instrument Panel Cluster (IPC), radio range and charge time estimations and messages are not correct. ● Battery range incorrect. ● Improved battery State of Charge (SoC) accuracy in off-nominal conditions. ● Battery heating values incorrect on radio when on Performance Pages display. ● Charging does not start when plugged in. ● Charging is not indicating when battery is at full charge. ● Charging slow or takes too long. ● Bumps and jerks while accelerating or decelerating. Wrench icon is illuminated on the IPC. ● Turtle icon is illuminated on the IPC. ● Vehicle enters into limp home mode. In addition, the following software enhancement is also available: ● Enables compatibility with the Flo V3 Chargers. This bulletin involves reprogramming the IDCM, BPCM, MCP A, MCP B and the EVCU with the latest available software and then, if needed, performing a Wheel End Disconnect Position Learn routine.

The document

• NHTSA's copy of the document (PDF)
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The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

Trouble codes named

B12B4, C10F8, C10F9, C10FA, C10FB, P061B

Listing a model year does not mean every vehicle of it is concerned: the document says which.

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