C106B

Code

Generic C — Chassis

Vehicle Stability Control Module — Internal Fault

Brand: Generic

Type: C — Chassis

Views: UK: 20 EN: 20 RU: 15

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Page language: EN

Causes

Internal processor, memory, or electronic component failure inside the VSC/ESC control module
Corrupted or failed module firmware/software
Low or intermittent power supply (battery/ignition circuit) to the module
Poor or corroded ground or connector pins (power, ground or CAN bus)
Water ingress or physical damage to the module
CAN-bus communication errors or bus termination faults

Symptoms

ESC/VSC warning lamp illuminated on dash
ABS/Traction Control may be disabled or show fault lights
Loss of traction/stability control or some related functions degraded
Possible logged CAN communication errors and inability to communicate with the VSC module with a scan tool
Diagnostic trouble codes related to ABS, wheel speed sensors, yaw/steer sensors, or communication (U-codes) may appear

What to check

Use a capable scan tool to read all codes from ABS/ESC module and gateway modules; note freeze frame and bus error info
Confirm ability to communicate with the VSC module; check for U0100-type communication codes
Inspect battery condition and measure battery voltage with key on and engine cranking
Visually inspect module connectors, pins and wiring for corrosion, bent pins, water entry or damage
Check power and ground circuits at the module (voltage on +12V terminal, continuity to chassis ground)
Inspect fuses and relays related to ABS/VSC power supply

Signal parameters

CAN bus presence and message traffic to/from VSC module (message IDs, error frames)
Module supply voltage (expected ~12V with key ON, stable within spec)
Module ground resistance to chassis (low ohms)
Wheel speed sensor signals (frequency/voltage per RPM) on each wheel
Yaw-rate sensor output and steering angle sensor values
Brake pressure or brake switch signals (if applicable)

Diagnostic algorithm

Retrieve and record all DTCs from all modules. Note any related U-communication codes or sensor faults.
Attempt to communicate with the VSC module. If communication is lost, check vehicle network/gateway and other modules for communication.
Clear the codes, then key cycle and re-scan to see if C106B returns immediately or intermittently.
Verify battery state-of-charge and charging system; recharge or replace battery if voltage is low or unstable during tests.
Inspect the VSC module connector: disconnect, inspect pins for corrosion, bent pins, water entry, or debris; clean and reconnect securely.
With ignition ON, measure module power and ground at the connector; verify +12V and good ground continuity. Repair wiring if out of spec.
Check CAN bus integrity: measure for 2.5V idle levels, proper differential signals, and look for excessive error frames with a scope or advanced scan tool.
Verify related sensor inputs (wheel speeds, yaw, steering angle) are present and plausible. Repair any failed sensors that may cause module faults.
Check for available software updates or reflash procedures from the manufacturer; follow OEM reprogramming steps if firmware corruption is suspected.
If all wiring, power, ground and communication are good and software reflash fails to clear the fault, consider module replacement per OEM procedure and reprogram new module.
After repair/replacement, clear codes, perform recommended calibrations (steering angle, yaw sensor), and road test to confirm proper function.

Likely causes

Failed control module electronics (most common)
Loss of battery voltage or weak battery while module was active
Damaged connector, pin, or wiring short/open to power/ground/CAN
Corrupted firmware after an update or interrupted programming
CAN bus errors (short, high resistance, missing termination) causing module fault
Moisture or impact damage to module housing

Fault status

⚠️ Status

Internal fault detected in Vehicle Stability Control (VSC/ESC) module — module self-check/diagnostics reported an internal failure. Functions may be disabled until fault is cleared and root cause corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours