Front Impact Sensor 1 - Internal Circuit Failure
Signal from the front impact sensor is faulty or missing.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The front impact sensor detects collisions. If it’s broken, the airbag system won't deploy.
What the computer is actually seeing
The airbag control module monitors the front impact sensor's resistance level. Normal operation shows low resistance (near 0 ohms) during continuity checks. If the resistance is too high or there’s no signal, this code triggers.
What a healthy reading looks like
Resistance should be close to 0 ohms when the circuit is good. The sensor should show a response to simulated impacts.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect the wiring and connectors for damage or corrosion at the front impact sensor. Fix any found issues. If okay, continue.
- 2Measure the resistance at the front impact sensor with the connector unplugged. It should be near 0 ohms. If not, replace the sensor.
- 3Recheck the wiring for opens or shorts. Use a multimeter while wiggling wires to find intermittent faults.
- 4Reinstall everything and clear the code. Test drive the vehicle and see if the code returns.
Common causes
- Faulty front impact sensor
- Damaged wiring or connectors
- Corroded terminals at the sensor
- Faulty airbag control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, driving with this code means the airbag system may not deploy in a crash.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will return.
Why is this code associated with multiple sensors?
B0103 relates to the front impact sensor, but other codes indicate issues with similar sensors or circuit faults.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →