What this code means

The 48V BSG system is unable to provide electric torque assist during acceleration events. The vehicle operates without hybrid boost.

Symptoms

• No electric assist during acceleration
• Slightly reduced off-the-line performance
• Increased fuel consumption
• Turbo lag more noticeable (if turbocharged)
• 48V system indicator may illuminate

Common causes

• 48V battery SOC too low for assist
• BSG torque output limited by temperature
• 48V system in degraded mode
• Drive belt condition preventing torque transfer
• Control software limiting assist

Diagnostic steps

1. Check 48V battery SOC level
2. Monitor BSG temperature
3. Read 48V system inhibit reasons
4. Inspect drive belt condition
5. Review recent 48V system fault codes

Repair notes

Resolve underlying 48V system issue. Charge 48V battery. Replace drive belt if worn. Address thermal issues.

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