B2615 on Cadillac
Passenger Compartment Dimming 2 Circuit
B2615 on Cadillac vehicles indicates passenger compartment dimming 2 circuit. Au7o has documented this code across 1 Cadillac model — most commonly on XTS. General Motors body code. The body control module supplies battery voltage to the interior courtesy, dome, and reading lamps and sets B2615 when that circuit does not behave as commanded - typically a short to ground, a short to voltage, or an open in the dome/courtesy lamp control circuit, or a loss of battery supply to the BCM from the instrument panel fuse block. Symptoms are interior courtesy and dome lamps that stay off entirely, stay on constantly, or flicker, along with erratic interior illumination dimming. It does not trigger the check engine light or affect drivability. Exact set conditions vary by platform, so confirm against the service information for the specific year and model. Typical repair costs on Cadillac range from $150 to $600, depending on the specific model and root cause.
Common Causes of B2615
- •Short to ground in the courtesy/dome lamp control wiring
- •Open circuit or broken wire between the BCM and the lamps
- •Circuit shorted to voltage
- •Blown fuse or loss of battery supply at the instrument panel fuse block feed to the BCM
- •Failed door jamb switch or corroded lamp socket
- •Faulty body control module (least common)
B2615 on Cadillac by Model
Cadillac XTS(1 issue)
- HID Xenon Headlight Ballast Failure & Housing Moisture2013-2019
XTS HID/Xenon headlamps suffer ballast (HID control unit) failures and headlight-housing condensation that cause intermittent or total loss of a low beam. Owners report flickering, a headlamp that cuts out then comes back, or a dead side after a new bulb. Moisture entering the housing is a frequent root cause — water reaching the ballast causes rapid failure — and corrosion in the headlight wiring/ground (often shared with the upper LED DRL) can take out both the ballast and DRL together.
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What does B2615 mean on Cadillac?▼
B2615 stands for "Passenger Compartment Dimming 2 Circuit." General Motors body code. The body control module supplies battery voltage to the interior courtesy, dome, and reading lamps and sets B2615 when that circuit does not behave as commanded - typically a short to ground, a short to voltage, or an open in the dome/courtesy lamp control circuit, or a loss of battery supply to the BCM from the instrument panel fuse block. Symptoms are interior courtesy and dome lamps that stay off entirely, stay on constantly, or flicker, along with erratic interior illumination dimming. It does not trigger the check engine light or affect drivability. Exact set conditions vary by platform, so confirm against the service information for the specific year and model. On Cadillac specifically, this code is documented across 1 model.
What causes B2615 on Cadillac vehicles?▼
Common causes on Cadillac: Short to ground in the courtesy/dome lamp control wiring, Open circuit or broken wire between the BCM and the lamps, Circuit shorted to voltage, Blown fuse or loss of battery supply at the instrument panel fuse block feed to the BCM, Failed door jamb switch or corroded lamp socket. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B2615 on a Cadillac?▼
Repair costs on Cadillac range from $150 to $600, depending on the specific model and root cause.
Which Cadillac models have B2615 documented?▼
Au7o has documented B2615 on 1 Cadillac model: XTS.