B1904
Air Bag Crash Sensor 2 Feed/Return Circuit Failure
B1904 is an OBD-II diagnostic trouble code meaning: Air Bag Crash Sensor 2 Feed/Return Circuit Failure. Common causes: open or short circuit in shock sensor 2 circuit, corrosion of contacts or connectors. Estimated repair cost: $56–167.
Symptoms
- The passive safety system fault indicator is on
- Airbags may not deploy in a crash
- Error B1904 is stored in the SRS module memory
Causes
- Open or short circuit in shock sensor 2 circuit
- Corrosion of contacts or connectors
- Shock sensor 2 malfunction
- Wiring harness damage
- SRS control module problem
How to Fix
- Check the integrity of the shock sensor 2 circuit (open/short circuit)
- Inspect connectors and contacts for corrosion or damage
- If necessary, replace shock sensor 2
- Check wiring harness for damage
- Scan the SRS module for other errors
- Reset the error and check for its reappearance
Related codes
FAQ
What does the B1904 code mean?
B1904 is an OBD-II diagnostic trouble code that indicates: Air Bag Crash Sensor 2 Feed/Return Circuit Failure
What causes a B1904 error code?
The most common causes of B1904 include: Open or short circuit in shock sensor 2 circuit; Corrosion of contacts or connectors; Shock sensor 2 malfunction; Wiring harness damage.
How do I fix a B1904 diagnostic trouble code?
To fix B1904: Check the integrity of the shock sensor 2 circuit (open/short circuit). Inspect connectors and contacts for corrosion or damage. If necessary, replace shock sensor 2. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1904?
Do not drive — repair immediately
How much does it cost to fix B1904?
The estimated repair cost for B1904 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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