Interior Lamp Circuit Short to Ground
The interior lamp circuit has detected a short to ground.
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)
There's a problem with the wiring of the interior lights, causing them to not function properly because a wire is touching the ground somewhere.
What the computer is actually seeing
The Body Control Module (BCM) sees a voltage drop in the interior light circuit, indicating a short to ground, usually below 0.5 volts when it should be near battery voltage (around 12-14 volts).
What a healthy reading looks like
Interior light circuit should maintain a voltage level near battery voltage (12-14V) during operation.
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 condition of the wiring and connectors associated with the interior lights for damage or corrosion.
- 2Inspect the dome light switch for proper operation; test resistance across the switch.
- 3Measure voltage at the bulb socket; should be between 12-14 volts when the door is open or the switch is on.
- 4Look for any aftermarket modifications that could have disturbed the wiring.
Common causes
- Damaged wiring harness
- Faulty dome light switch
- Corroded connectors
- Aftermarket modifications or installations
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but the interior lights won't work, and it could lead to other issues if left unchecked.
Will this code come back after clearing?
If the short is still present, yes, it will return when the circuit is rechecked.
Why does this code appear with B162A?
Both codes are related to circuit issues in the interior lighting system.
Working a real vehicle right now?
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