What Does U1202 Mean?
The control module is not receiving valid data from the window control module over the SCP (Standard Corporate Protocol) J1850 communication network. This indicates a breakdown in communication between modules responsible for power window operation.
Common Causes
35%
Faulty or corroded SCP network connections or wiring harness damage
30%
Failed Driver Door Module (DDM) or window control module
20%
Low battery voltage or poor power supply to network modules
15%
Faulty Generic Electronic Module (GEM) or Body Control Module
Diagnostic Steps
1
Step 1: Check battery voltage and charging system; ensure voltage is above 12.4V at rest and 13.5-14.5V while running
2
Step 2: Inspect SCP bus network wiring for damage, corrosion, or loose connections at all module connectors
3
Step 3: Use scan tool to monitor live data on SCP network and identify which module is not communicating
4
Step 4: Check ground connections for all body control modules, clean and tighten as needed
5
Step 5: Test window control module operation and replace if communication cannot be restored
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The control module is not receiving valid data from the window control module over the SCP (Standard Corporate Protocol) J1850 communication network. This indicates a breakdown in communication between modules responsible for power window operation.
The most common cause of U1202 (SCP (J1850) Invalid or Missing Data for Windows) is: Faulty or corroded SCP network connections or wiring harness damage
Typical repair costs for U1202 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety impact, but non-functional windows may prevent escape in emergency situations. Vehicle remains safe to drive.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1202 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network
Difficulty
Type
Manufacturer
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