Battery Voltage Low at Lamp
Indicates the battery voltage is low at the interior lamp 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 interior lights are getting less voltage than they need, causing them to dim or not work properly. This usually happens when the battery voltage is low or there’s an issue with the wiring.
What the computer is actually seeing
The body control module (BCM) monitors the voltage level coming from the battery through the interior lamp circuit. It expects to see around 12.5 to 14.5 volts when the vehicle is off and 14.5 to 15.5 volts when running.
What a healthy reading looks like
12.5-14.5 volts (off); 14.5-15.5 volts (running)
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.
- 1Check the battery voltage with a multimeter; should be 12.5-14.5 volts (off) and 14.5-15.5 volts (running). If low, recharge or replace the battery. Decision: Is battery voltage normal? (Yes: go to step 2; No: fix battery issue first)
- 2Inspect the battery terminals for corrosion or loose connections. Clean and tighten as needed. Decision: Are terminals clean and secure? (Yes: go to step 3; No: fix connections and retest)
- 3Check the wiring from the battery to the interior lamp circuit for damage, shorts, or opens. Look for bad connectors or frayed wires. Decision: Is wiring intact? (Yes: possible BCM issue; No: repair wiring as necessary)
- 4If all previous steps are good, test or replace the body control module (BCM) as it may be faulty causing low voltage readings.
Common causes
- Weak battery
- Corroded battery terminals
- Voltage drop due to poor connections or wiring
- Faulty body control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's generally safe, but interior lights may not work properly until it's fixed.
Will this code come back after reset?
If the underlying issue is not fixed (like a bad battery or wiring), it will likely return.
What does this have to do with other systems?
The BCM controls many functions, so a voltage issue can affect lights, locks, and other accessories.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →