What Does U1197 Mean?
Duplicate or secondary door lock communication fault on the SCP J1850 network. This code typically indicates a second door module or related controller has lost network communication.
Common Causes
35%
Failed rear door module or second door control module
30%
Wiring harness damage in rear door or B-pillar area
20%
Body Control Module communication error with multiple door modules
15%
SCP network bus fault affecting multiple nodes simultaneously
Diagnostic Steps
1
Step 1: Determine which specific door module (rear, passenger side) is not communicating via scan tool network test
2
Step 2: Check power supply and ground connections at the non-communicating door module
3
Step 3: Inspect wiring and connectors at door hinge and B-pillar areas for physical damage
4
Step 4: Test SCP bus signal integrity at affected module connector using oscilloscope or multimeter
5
Step 5: Replace affected door module if circuits test good but module remains offline
Estimated Repair Cost
$175 - $650
Parts + labor, varies by vehicle and location
Duplicate or secondary door lock communication fault on the SCP J1850 network. This code typically indicates a second door module or related controller has lost network communication.
The most common cause of U1197 (SCP (J1850) Invalid or Missing Data for Door Locks) is: Failed rear door module or second door control module
Typical repair costs for U1197 range from $175 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear door locks or additional door locks may not function, reducing vehicle security. Child safety locks may not operate as intended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1197 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network / Door Lock System
Difficulty
Type
Manufacturer
Recommended Tools
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