What Does B1682 Mean?
This code indicates that the Passive Anti-Theft System (PATS) has been disabled or has lost communication with the transponder key system. The body control module (BCM) or powertrain control module (PCM) has detected a failure in the communication link between the PATS control module and the transponder receiver that reads the chip in the ignition key. This prevents the vehicle from verifying key authenticity, which may result in a no-start condition or inability to arm/disarm the security system.
Safety Warning
The vehicle may be immobilized and unable to start, leaving you stranded. While not a direct safety hazard if the vehicle runs, losing anti-theft protection increases theft risk and the no-start condition requires immediate repair to restore vehicle operation.
Common Causes
35%
Faulty or damaged transponder key chip or weak signal from key
30%
Failed transceiver module or antenna ring around ignition cylinder
20%
Damaged wiring harness or poor connections between PATS module and transceiver
15%
Failed body control module or PATS control module requiring reprogramming or replacement
Diagnostic Steps
1
Step 1: Attempt to start the vehicle with all available keys to determine if the issue is key-specific or system-wide. Observe security light behavior during key-on and cranking attempts (rapid flashing indicates no key communication, solid indicates system fault).
2
Step 2: Using a multimeter, check for proper voltage supply (typically 12V) and ground at the transceiver module connector near the ignition lock cylinder. Verify continuity in the wiring between the transceiver and the BCM/PCM.
3
Step 3: Inspect the transponder antenna ring around the ignition lock cylinder for physical damage, loose connections, or corrosion. Remove and reinstall connectors, cleaning with electrical contact cleaner if necessary.
4
Step 4: Access PATS module status and key programming information through the scan tool's enhanced diagnostics. Check if keys are properly programmed to the system and if the PATS module recognizes any valid keys in memory.
5
Step 5: If all keys fail recognition, attempt to reprogram or relearn keys using factory procedures through the scan tool or security access mode (may require PIN code or dealer-level access).
6
Step 6: If wiring, keys, and transceiver test good but code persists, suspect BCM/PATS module failure. Verify module communication on network buses and consider module replacement followed by key reprogramming.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates that the Passive Anti-Theft System (PATS) has been disabled or has lost communication with the transponder key system. The body control module (BCM) or powertrain control module (PCM) has detected a failure in the communication link between the PATS control module and the transpo...
The most common cause of B1682 (PATS Is Disabled (Check Link Between PATS And Transponder)) is: Faulty or damaged transponder key chip or weak signal from key
Typical repair costs for B1682 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may be immobilized and unable to start, leaving you stranded. While not a direct safety hazard if the vehicle runs, losing anti-theft protection increases theft risk and the no-start condition requires immediate repair to restore vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1682 to identify the root cause.
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Quick Info
Category
Body
System
Anti-Theft/Security System
Difficulty
Type
Manufacturer
Recommended Tools
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