What Does U1206 Mean?
The control module cannot receive valid data from the primary identification module on the SCP network. This typically relates to anti-theft system, key recognition, or immobilizer communication failures.
Safety Warning
Vehicle may not start or may stall while driving if immobilizer activates. May leave driver stranded in unsafe location.
Common Causes
35%
Failed Passive Anti-Theft System (PATS) module or transceiver
25%
Damaged key or worn transponder chip
20%
Wiring issues between anti-theft module and body control module
20%
Powertrain Control Module (PCM) communication failure with security system
Diagnostic Steps
1
Step 1: Attempt to start vehicle with all available keys to rule out individual key failure
2
Step 2: Check anti-theft indicator light behavior during key-on and cranking cycles
3
Step 3: Use scan tool to verify PCM and BCM can communicate with each other
4
Step 4: Test voltage and ground at PATS transceiver module during key recognition attempt
5
Step 5: Perform key programming procedure if module communication is functional but keys not recognized
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The control module cannot receive valid data from the primary identification module on the SCP network. This typically relates to anti-theft system, key recognition, or immobilizer communication failures.
The most common cause of U1206 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Failed Passive Anti-Theft System (PATS) module or transceiver
Typical repair costs for U1206 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or may stall while driving if immobilizer activates. May leave driver stranded in unsafe location.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1206 to identify the root cause.
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Quick Info
Category
Network
System
Anti-Theft/Security System
Difficulty
Type
Manufacturer
Recommended Tools
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