B0103 Warning

OBD2 code B0103: Front Crash Sensor Left Communication Lost

Communication with the left front crash sensor has been lost; SRS deployment logic for frontal impacts is degraded.

ECU: BCM

Detected Root Component

Body Component

Confidence level: low

Observed Symptoms

Warning light or symbol related to the affected system
Comfort or safety function impaired

Possible Causes

Open bus wiring
Gateway module routing CAN messages incorrectly
CAN terminating resistor (120 Ω) drifted out of spec

Diagnostic Progress 0 %

Difficulty Easy

Est. time 30-60min

Tools Required 5 tool(s)

Tools Required

multimeter OBD scanner wiring diagram flashlight mirror

Interactive Diagnostic

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Diagnostic Result

certainty points

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Parts likely to be the cause (Boîtier fusibles / BSI)

Boîtier fusibles / BSI

Photo d'illustration : Boîtier fusibles / BSI

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Frequently asked questions about code B0103

What does code B0103 mean? ▾

OBD2 code B0103: Front Crash Sensor Left Communication Lost. Communication with the left front crash sensor has been lost; SRS deployment logic for frontal impacts is degraded.

What are the symptoms of code B0103? ▾

Code B0103 may cause: Warning light or symbol related to the affected system, Comfort or safety function impaired. The intensity of these symptoms varies depending on the vehicle and driving conditions.

What causes code B0103? ▾

The most common causes of code B0103 are: Open bus wiring, Gateway module routing CAN messages incorrectly, CAN terminating resistor (120 Ω) drifted out of spec. A proper OBD2 diagnostic will pinpoint the exact cause.

Is it serious to drive with code B0103? ▾

Code B0103 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.

How do I fix code B0103? ▾

Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Open bus wiring, Gateway module routing CAN messages incorrectly, CAN terminating resistor (120 Ω) drifted out of spec. Difficulty: Easy · Estimated time: 30-60min.

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