Battery Management System Communication Error
There's a communication issue with the battery management system.
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 car's computer can't talk to the battery management system, which tracks the battery's health and status. This could happen if a wire is broken or a connector is loose.
What the computer is actually seeing
The vehicle's PCM (Powertrain Control Module) expects to receive specific signals indicating battery voltage and health status. If these signals are missing or erratic, the PCM triggers the B247E code.
What a healthy reading looks like
Normal battery voltage should be around 12.6 volts when fully charged. The expected communication signals should have consistent data updates between 1-2 seconds intervals when the vehicle is on.
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. Inspect the battery terminals for corrosion and ensure the connections are tight. Decision: If corroded, clean and retest. If connections are good, proceed to step 2.
- 22. Check the wiring and connectors between the battery and the battery management system for damage. Decision: If damaged, repair or replace wiring and retest. If wiring is intact, proceed to step 3.
- 33. Measure the battery voltage with a multimeter. Expected should be around 12.6 volts. Decision: If voltage is low, charge or replace battery and retest. If voltage is normal, proceed to step 4.
- 44. Scan for other related diagnostic trouble codes that may indicate a broader issue within the BMS or PCM. Decision: Address any additional codes before retesting.
Common causes
- Loose or damaged wiring to the battery management system
- Faulty battery management system module
- Corroded connectors at the battery or BMS
- Weak or failing battery
- Software issues in the PCM or BMS
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but should be fixed soon. Lack of proper battery management can lead to starting issues or electrical problems.
Will this fault code return after I clear it?
Yes, if the underlying issue isn’t fixed. Expect it to come back if there's still a communication problem.
Why does this code couple with other codes?
The BMS is part of a critical system. Issues here can influence battery performance, affecting other modules that rely on proper power supply.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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