What Does U1216 Mean?
Communication error on the SCP (Standard Corporate Protocol) J1850 network regarding external lamp outage status data. One module is not receiving proper lamp failure information from another module on the network.
Common Causes
35%
Faulty lighting control module (LCM) or body control module (BCM) not transmitting data
30%
Corroded or damaged SCP network wiring or connectors
20%
Failed bulb outage detection circuit or lamp driver in control module
15%
Intermittent ground connection at lighting control module
Diagnostic Steps
1
Step 1: Verify all external lamps (headlights, tail lights, turn signals) are functioning and none are burned out
2
Step 2: Check SCP network communication using scan tool datastream between BCM and LCM
3
Step 3: Inspect SCP network connectors at lighting control module and body control module for corrosion or bent pins
4
Step 4: Test continuity and resistance of SCP bus wiring between modules (should be 60-120 ohms)
5
Step 5: Monitor live data for lamp outage detection parameters while activating each lamp circuit
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
Communication error on the SCP (Standard Corporate Protocol) J1850 network regarding external lamp outage status data. One module is not receiving proper lamp failure information from another module on the network.
The most common cause of U1216 (SCP (J1850) Invalid or Missing Data for External Lamp Outage) is: Faulty lighting control module (LCM) or body control module (BCM) not transmitting data
Typical repair costs for U1216 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Lamp outage warning system may not alert driver to failed external lights, reducing visibility to other drivers. Vehicle is safe to drive but lighting should be manually checked regularly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1216 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network / Lighting System
Difficulty
Type
Manufacturer
Recommended Tools
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