B1139
Diagnosis Sensor Unit
B1139 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the srs diagnostic module, short circuit or break in the wiring harness. Estimated repair cost: $111–556.
Symptoms
- SRS/airbag indicator is on
- Blocking the operation of the passive safety system
- No diagnostic signal from the module
Causes
- Damage to the SRS diagnostic module
- Short circuit or break in the wiring harness
- Oxidation of module connector contacts
- Exposure to moisture or corrosion
- Module software failure
How to Fix
- Check the integrity of the wiring harness and module connectors
- Clean contacts from oxidation
- Scan the module for additional errors
- Check the power supply and ground of the module
- Replace SRS diagnostic module if necessary
Related codes
FAQ
What does the B1139 code mean?
B1139 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1139 error code?
The most common causes of B1139 include: Damage to the SRS diagnostic module; Short circuit or break in the wiring harness; Oxidation of module connector contacts; Exposure to moisture or corrosion.
How do I fix a B1139 diagnostic trouble code?
To fix B1139: Check the integrity of the wiring harness and module connectors. Clean contacts from oxidation. Scan the module for additional errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1139?
Do not drive — repair immediately
How much does it cost to fix B1139?
The estimated repair cost for B1139 is $111–556. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat