Keyless Entry Transmitter Battery Low
Indicates that the keyless entry transmitter's battery is low.
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 battery in your key fob is getting weak, which might cause issues with locking/unlocking your vehicle remotely.
What the computer is actually seeing
The Body Control Module (BCM) detects a voltage drop in the key fob transmitter battery during normal operation.
What a healthy reading looks like
Key fob battery voltage should be around 3 volts when fresh; significantly less (under 2.5 volts) indicates a low battery.
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 the battery voltage in the keyless entry fob using a multimeter. If it's under 2.5 volts, replace the battery. Decision: If replacing the battery solves the issue, repair is complete.
- 22. Inspect the battery contacts in the key fob for corrosion or damage. Clean or repair as necessary. Decision: If cleaning resolves the issue, repair is complete.
- 33. If the problem persists after battery replacement and contact cleaning, replace the key fob. Decision: If a new key fob solves the problem, repair is complete.
Common causes
- Weak key fob battery
- Corroded battery contacts
- Faulty key fob
Typical repair cost
$10-$50
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, you can still drive the vehicle, but you might have trouble using the remote features.
Will this code come back after replacing the battery?
If the battery is properly replaced and the contacts are good, this code should not return.
Why does this code pair with B2698?
B2698 indicates a similar issue with another fob or an additional problem, often suggesting multiple key fob issues.
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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