B1003
Diagnosis Sensor Unit
B1003 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: open or short circuit in wiring harness, corrosion of diagnostic unit contacts. Estimated repair cost: $111–333.
Symptoms
- SRS (airbag) light is on
- The passive restraint system is not activated during the test
- The error persists after being reset by the scanner
Causes
- Open or short circuit in wiring harness
- Corrosion of diagnostic unit contacts
- Internal diagnostic unit fault
- Damage after an accident
- Incorrect connection of SRS components
How to Fix
- Check the wiring harness for opens and shorts
- Clean the contacts of the diagnostic unit
- Test the diagnostic unit on another car (if possible)
- Replace the diagnostic unit if the fault is confirmed
- Reset the error and check the system
Related codes
FAQ
What does the B1003 code mean?
B1003 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1003 error code?
The most common causes of B1003 include: Open or short circuit in wiring harness; Corrosion of diagnostic unit contacts; Internal diagnostic unit fault; Damage after an accident.
How do I fix a B1003 diagnostic trouble code?
To fix B1003: Check the wiring harness for opens and shorts. Clean the contacts of the diagnostic unit. Test the diagnostic unit on another car (if possible). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1003?
Do not drive — repair immediately
How much does it cost to fix B1003?
The estimated repair cost for B1003 is $111–333. Actual cost depends on your vehicle, location, and labor rates.
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