B1204
Diagnosis Sensor Unit
B1204 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the srs wiring harness, oxidation of contacts in the connectors of the diagnostic unit. Estimated repair cost: $56–167.
Symptoms
- The SRS indicator on the dashboard is on
- The passive safety system may not work in an accident.
- Error persists after OBD-II scan
Causes
- Damage to the SRS wiring harness
- Oxidation of contacts in the connectors of the diagnostic unit
- Malfunction of the sensor diagnostic unit itself
- Problems with power or grounding of the unit
- Incorrect programming of the unit after repair
How to Fix
- Check the SRS wiring harness for damage.
- Clean the contacts in the connectors of the diagnostic unit
- Check power supply and grounding of the unit
- Scan the system for additional errors
- If necessary, replace the sensor diagnostic unit
- Reset the error and check if it returns
Related codes
FAQ
What does the B1204 code mean?
B1204 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1204 error code?
The most common causes of B1204 include: Damage to the SRS wiring harness; Oxidation of contacts in the connectors of the diagnostic unit; Malfunction of the sensor diagnostic unit itself; Problems with power or grounding of the unit.
How do I fix a B1204 diagnostic trouble code?
To fix B1204: Check the SRS wiring harness for damage.. Clean the contacts in the connectors of the diagnostic unit. Check power supply and grounding of the unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1204?
Do not drive — repair immediately
How much does it cost to fix B1204?
The estimated repair cost for B1204 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat