2024-2025 GM EV MIL & Service High Voltage Message DTC P061B

Owners of 2024-2025 Cadillac, Chevrolet, and GMC electric vehicles may notice a Malfunction Indicator Lamp (MIL) illuminating or a "Service High Voltage" message appearing on their instrument panel. This issue is often accompanied by the diagnostic trouble code (DTC) P061B, which may be stored as either a history or current fault. General Motors has issued Service Bulletin PIP6140 to address this concern, identifying a potential software anomaly as the root cause.

This bulletin provides guidance for technicians on how to correct the issue, ensuring proper vehicle operation and preventing recurrence of the warning messages. The resolution involves updating the vehicle's software and calibrations, which can be performed via an Over-The-Air (OTA) update or through service programming.

Symptoms

Vehicle owners may observe a few key indicators that point to this specific issue. The primary symptom is the illumination of the Malfunction Indicator Lamp (MIL), commonly known as the "Check Engine" light. Additionally, the instrument panel cluster (IPC) may display a "Service High Voltage" message. Some customers might report that the vehicle appeared to have no issues after a sleep cycle, only for the warning to reappear.

Fault Codes / DTCs

The diagnostic trouble code associated with this condition is P061B. Technicians may find this DTC stored in the vehicle's system as either a current or historical fault.

Diagnosis / Trigger Conditions

When a technician encounters a vehicle exhibiting these symptoms and the Chevrolet Silverado EV DTC P061B is present, the primary cause is suspected to be a software anomaly. The diagnostic process involves checking for the presence of DTC P061B. If the vehicle already has the latest K107 Drive Motor Control Module Software and Calibrations, the Service Programming System (SPS) will display "SKIP." If the DTC P061B resets after the initial software update, further diagnostics outlined in the Service Information are required, specifically involving a test drive with One Pedal Drive (OPD) ON.

Repair Procedure Summary

The recommended correction for the Chevrolet Silverado EV DTC P061B involves updating the software and calibrations for the K107 Drive Motor Control Module(s). This can be done using the Service Programming System (SPS) and Vehicle Wide Programming. Technicians should reference bulletin 24-NA-132 for detailed instructions on claim submission. If the vehicle already possesses the most current software, the SPS will indicate "SKIP" during the programming attempt. Following the software update, a test drive with One Pedal Drive (OPD) enabled is necessary. If the DTC P061B reappears, technicians must then follow the standard diagnostic procedures outlined in the Service Information.

Required Tools or Parts

The repair primarily involves software updates rather than physical part replacement. Technicians will utilize the Service Programming System (SPS) for Vehicle Wide Programming. For warranty claims related to this service, specific labor operations are provided:

• Labor Operation 5080528*: Used for updating the K107 Drive Motor Control Modules, with an estimated labor time of 1.5 hours. This is a unique labor operation specifically for this bulletin.
• Labor Operation 2819505: Used for Vehicle Wide Programming, following the guidelines in bulletin 24-NA-132 for claim submission.

Important Warnings

General Motors emphasizes that these bulletins are intended for use by professional technicians and are NOT for