B1864
Battery Power Supply ECU Circuit Failure
B1864 is an OBD-II diagnostic trouble code meaning: Battery Power Supply ECU Circuit Failure. Common causes: blown srs circuit fuse, open or short circuit in wiring harness. Estimated repair cost: $33–167.
Symptoms
- SRS/air bag indicator is on
- Security fault message on display
- Airbags disabled
- Belt pretensioners do not work
Causes
- Blown SRS circuit fuse
- Open or short circuit in wiring harness
- Corrosion of ECU connector contacts
- Faulty security power relay
- Problems with ground (grounding) of the ECU
- Low battery voltage
- Faulty SRS electronic control unit
How to Fix
- Check and replace the SRS circuit fuse if necessary.
- Visually inspect the wiring harness for damage
- Check the voltage at the computer terminals with the ignition on
- Clean connector contacts from corrosion
- Check the reliability of the ECU ground connection
- Scan the system for additional trouble codes
- If necessary, replace the SRS electronic control unit
Related codes
FAQ
What does the B1864 code mean?
B1864 is an OBD-II diagnostic trouble code that indicates: Battery Power Supply ECU Circuit Failure
What causes a B1864 error code?
The most common causes of B1864 include: Blown SRS circuit fuse; Open or short circuit in wiring harness; Corrosion of ECU connector contacts; Faulty security power relay.
How do I fix a B1864 diagnostic trouble code?
To fix B1864: Check and replace the SRS circuit fuse if necessary.. Visually inspect the wiring harness for damage. Check the voltage at the computer terminals with the ignition on. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1864?
Do not drive — repair immediately
How much does it cost to fix B1864?
The estimated repair cost for B1864 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat