What Does B1980 Mean?
B1980 indicates the Body Control Module (BCM) has detected a bulb outage in one of the vehicle's exterior or interior lighting circuits. The BCM continuously monitors current draw through lighting circuits and sets this code when it detects an open circuit or insufficient current flow indicating a burned-out bulb or circuit fault. This is a manufacturer-specific code, so the exact bulb location varies by vehicle make and model.
Common Causes
50%
Burned out bulb in exterior lighting (tail light, brake light, turn signal, license plate light, or headlight)
25%
Corroded or damaged bulb socket causing poor electrical contact
15%
Open circuit in wiring harness between BCM and bulb (broken wire, damaged connector)
10%
BCM internal circuit fault or faulty bulb outage detection module
Diagnostic Steps
1
Step 1: Using the scan tool, access BCM freeze frame data and active parameters to identify which specific bulb circuit triggered the code (e.g., left tail lamp, right brake light, etc.)
2
Step 2: Perform visual inspection of all exterior and interior bulbs, focusing on the circuit identified in Step 1. Check for obvious burned-out filaments, broken bulbs, or moisture in lamp housings
3
Step 3: Remove the suspected bulb and inspect the socket for corrosion, melted terminals, or burnt contacts. Clean terminals with electrical contact cleaner and check socket resistance (should be less than 0.5 ohms to ground)
4
Step 4: With bulb removed, use a multimeter to check for proper voltage at the socket (typically 12V) when circuit is activated. If no voltage present, backprobe wiring harness connectors toward BCM checking for open circuits or damaged wiring
5
Step 5: Install a known-good bulb of correct specification and activate the circuit. Monitor BCM data stream for current draw (typical draw: 0.5-2.1A depending on bulb type). If current is within specification but code persists, suspect BCM fault
6
Step 6: Clear codes and perform functional test of all lighting circuits. Road test vehicle and verify code does not return and all bulb monitoring functions operate correctly
Estimated Repair Cost
$15 - $350
Parts + labor, varies by vehicle and location
B1980 indicates the Body Control Module (BCM) has detected a bulb outage in one of the vehicle's exterior or interior lighting circuits. The BCM continuously monitors current draw through lighting circuits and sets this code when it detects an open circuit or insufficient current flow indicating a b...
The most common cause of B1980 (Bulb - Outage Condition Detected) is: Burned out bulb in exterior lighting (tail light, brake light, turn signal, license plate light, or headlight)
Typical repair costs for B1980 range from $15 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven but should be repaired promptly, especially if brake lights, turn signals, or headlights are affected as this creates a safety hazard and may result in traffic citations. Non-functional lights significantly increase risk of rear-end collisions or being unseen by other drivers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1980 to identify the root cause.
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Quick Info
Category
Body
System
Exterior/Interior Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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