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BODY SYSTEM

Body Trouble Codes

Browse all 50 trouble codes starting with B in the body subsystem.

Driver Frontal Stage 1 Deployment Control Fault

OBDAssistant

AI-powered vehicle intelligence for Android. Connect an ELM327 Bluetooth adapter to decode trouble codes and get live mechanic guidance.

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Diagnose by symptom

It cranks, but it will not fire
It failed the emissions test
The light came on right after you filled up
It hesitates when you ask for power
The temperature is not where it should be
Why your engine shakes at idle
Something is rattling underneath
It stalls when you come to a stop
Your fuel economy fell off a cliff
Several warning lights came on together

Trouble codes

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Guides & reference

Technical wiki
CAN Bus Architecture: The Vehicle's Nervous System
ECU Knock Logic: The Physics of Engine Protection
OBD2 Emissions Readiness Monitors Explained
Fuel Trim Mastery: Cracking the STFT/LTFT Puzzle
O2 Sensor Volatility: Signal Cross-Count Analysis
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