What Does U1217 Mean?
Secondary or redundant communication fault on the SCP J1850 network related to external lamp outage monitoring. Similar to U1216 but may indicate a different data parameter or module communication path failure.
Common Causes
35%
Body control module internal circuit failure or software corruption
25%
SCP network termination resistor failure or incorrect resistance
20%
Instrument cluster communication failure with lighting system
20%
Damaged SCP data bus wiring causing signal interference
Diagnostic Steps
1
Step 1: Compare U1216 and U1217 freeze frame data to identify which specific lamp circuit is affected
2
Step 2: Use advanced scan tool to monitor SCP network message traffic and identify missing PID messages
3
Step 3: Check for power and ground at body control module and lighting control module
4
Step 4: Inspect SCP bus for proper termination resistance at network endpoints
5
Step 5: Substitute known-good module if available to isolate faulty component
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
Secondary or redundant communication fault on the SCP J1850 network related to external lamp outage monitoring. Similar to U1216 but may indicate a different data parameter or module communication path failure.
The most common cause of U1217 (SCP (J1850) Invalid or Missing Data for External Lamp Outage) is: Body control module internal circuit failure or software corruption
Typical repair costs for U1217 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Redundant warning system failure may leave driver unaware of lighting malfunctions. Verify all exterior lighting operation manually before night driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1217 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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