B1125
Diagnosis Sensor Unit
B1125 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the wiring harness (harness), corrosion of contacts in the diagnostic circuit. Estimated repair cost: $56–167.
Symptoms
- Airbag light is on
- Restraint system fault message on the instrument panel
- The safety system may not work in an accident
Causes
- Damage to the wiring harness (harness)
- Corrosion of contacts in the diagnostic circuit
- Malfunction of the sensor diagnostic unit
- Problems with squibs or shock sensors
How to Fix
- Check the integrity of the passive restraint system wiring harness
- Inspect contacts and connectors for corrosion
- Scan the system for other related error codes
- Test the sensor diagnostic unit with specialized equipment
- If necessary, replace the faulty component
Related codes
FAQ
What does the B1125 code mean?
B1125 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1125 error code?
The most common causes of B1125 include: Damage to the wiring harness (harness); Corrosion of contacts in the diagnostic circuit; Malfunction of the sensor diagnostic unit; Problems with squibs or shock sensors.
How do I fix a B1125 diagnostic trouble code?
To fix B1125: Check the integrity of the passive restraint system wiring harness. Inspect contacts and connectors for corrosion. Scan the system for other related error codes. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1125?
Do not drive — repair immediately
How much does it cost to fix B1125?
The estimated repair cost for B1125 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat