What Does U1171 Mean?
This is a duplicate or related fault for the cellular phone/paging system communication error. Multiple related codes suggest a persistent or intermittent network communication issue with the phone module.
Common Causes
35%
Intermittent connection at cellular phone module connector
30%
Intermittent open in SCP bus wiring to phone module
20%
Failing cellular phone module with intermittent internal fault
10%
Loose or corroded ground connection causing intermittent operation
5%
Voltage fluctuation or power supply issue to phone module
Diagnostic Steps
1
Step 1: Wiggle test all connectors while monitoring live data on scan tool for communication drops
2
Step 2: Check for corrosion inside connector boots using inspection camera or visual inspection
3
Step 3: Monitor power supply voltage to module during operation - should remain stable at 12-14V
4
Step 4: Inspect wiring harness routing for chafing points or areas where wire insulation may be damaged
5
Step 5: Use infrared thermometer to check for hot spots indicating high resistance connections
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
This is a duplicate or related fault for the cellular phone/paging system communication error. Multiple related codes suggest a persistent or intermittent network communication issue with the phone module.
The most common cause of U1171 (SCP (J1850) Invalid or Missing Data for Cellular Phone / Paging System) is: Intermittent connection at cellular phone module connector
Typical repair costs for U1171 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety concerns. Vehicle operation is not affected, only convenience features related to cellular phone integration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1171 to identify the root cause.
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Quick Info
Category
Network
System
Telematics/Cellular Communication System
Difficulty
Type
Manufacturer
Recommended Tools
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