Battery Disconnect Signal
There's a fault in the battery disconnect signal circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer isn’t seeing the battery disconnect switch like it should, which can affect power flow and system operation.
What the computer is actually seeing
The vehicle's computer monitors the battery disconnect signal for proper voltage (typically around 12V when connected). If the signal is absent or below a certain threshold (like 5V), it triggers this code.
What a healthy reading looks like
The expected voltage from the battery disconnect signal should be close to battery voltage, around 12V; if it drops below 5V, the fault is triggered.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check battery connections for tightness and corrosion. Repair as needed.
- 22. Measure voltage at the battery disconnect switch with the key on. You should see around 12V.
- 33. If voltage is low or absent, check wiring between the switch and the ECM for damage or shorts.
- 44. Replace the battery disconnect switch if it's not functioning correctly.
- 55. Clear the code and recheck after repairs.
Common causes
- Loose or corroded battery terminal connections
- Faulty battery disconnect switch
- Damaged wiring in the disconnect circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix it soon; it can affect vehicle power management.
Will this code come back after clearing?
If the problem persists, it will likely return. A proper fix is required.
Why does this code pair with B160D?
Both codes relate to the battery disconnect system, indicating issues in the circuit.
Working a real vehicle right now?
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