482656

What the Code Means

482656 is stored in the 1C Integrated chassis management module (variant icm_25) and reads “Slip angle estimator — internal degradation due to SBS”: internal degradation of the slip angle estimator caused by the power supply system (SBS) condition. Slip angle estimation is part of the DSC calculations. With unreliable input data or power supply problems, the module can't guarantee correct operation of the stabilization loops.

This code was logged alongside three related codes: 482651 (Slip angle estimator — inputs not valid SBS), 4827B3 (Internal control unit — Undervoltage at Terminal 30), and 48002C (LDM function — high-level operational readiness brake control unit). The cluster points to a common cause: low voltage at Terminal 30. For code 48002C, bmwfault.codes reports that driver assistance activation is not possible and DSC won't allow activation; permissible supply voltage is between 9 and 16 volts with Terminal 15 on.

The instrument cluster shows “Chassis Stabilization: Drive moderately” and “Brake system: Stop carefully”.

Symptoms

• The instrument cluster displays “Chassis Stabilization: Drive moderately” and “Brake system: Stop carefully”.
• Codes 482651, 482656, 4827B3, and 48002C are stored in the 1C Integrated chassis management module.
• Driver assistance activation is not possible: DSC won't allow activation (per code 48002C).
• Code 4827B3 indicates low voltage at Terminal 30.

Diagnosis and Repair

1. Start by checking the battery. The discussion recommends testing the battery first, since code 4827B3 for low voltage at Terminal 30 is stored in the module — that's the most likely root cause of the whole code cluster.

1. If the fault is confirmed, replace the battery and make sure to register (code) it in the control module: “Make sure you have it properly coded on install”. Replacing it without registration leads to incorrect operation of the power supply system and new codes.

1. After replacing the battery, clear all codes and see which ones return: “Changing out the battery will always produce a bunch of fault codes. Clear all the codes and find which come back”. The battery swap itself generates a set of codes, so you can only judge real faults after re-scanning.

1. For code 48002C, bmwfault.codes recommends continuing diagnosis in the DSC control module and working through the fault using the test plan, then clearing the fault in Integrated Chassis Management.

A typical diagnostic mistake is starting by replacing ICM or DSC components without checking the battery and the Terminal 30 circuit: with low voltage, the slip angle estimator and brake circuit readiness codes show up as a consequence.