B1109
Diagnosis Sensor Unit
B1109 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the wiring harness (harness), malfunction of the sensor diagnostic unit. Estimated repair cost: $56–167.
Symptoms
- The Security System (SRS) indicator light is on.
- Disabling airbags in the event of an accident
- Malfunctions in the operation of belt pretensioners
Causes
- Damage to the wiring harness (harness)
- Malfunction of the sensor diagnostic unit
- Short circuit or open circuit in the sensor circuit
- Contact corrosion
- Control unit software error
How to Fix
- Carry out diagnostics with an OBD-II scanner to read additional codes
- Check the integrity of the wiring harness (harness) and contacts
- Measure resistance in sensor circuits
- Check the status of the sensor diagnostic unit
- If necessary, replace faulty components or reflash the control unit
Related codes
FAQ
What does the B1109 code mean?
B1109 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1109 error code?
The most common causes of B1109 include: Damage to the wiring harness (harness); Malfunction of the sensor diagnostic unit; Short circuit or open circuit in the sensor circuit; Contact corrosion.
How do I fix a B1109 diagnostic trouble code?
To fix B1109: Carry out diagnostics with an OBD-II scanner to read additional codes. Check the integrity of the wiring harness (harness) and contacts. Measure resistance in sensor circuits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1109?
Do not drive — repair immediately
How much does it cost to fix B1109?
The estimated repair cost for B1109 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat