What Does B2723 Mean?
DTC B2723 indicates a fault in the PASS-Key (Passive Anti-theft System) detection circuit. The Body Control Module (BCM) or Theft Deterrent Module has detected an abnormal voltage, resistance, or signal from the key transponder detection system. This prevents the vehicle's anti-theft system from properly recognizing the correct ignition key, which may result in a no-start condition or extended cranking times.
Safety Warning
Vehicle may not start or may stall shortly after starting, leaving you stranded. While not immediately dangerous if the vehicle is already running normally, the anti-theft system failure creates a critical no-start risk and should be repaired promptly to avoid being stranded.
Common Causes
35%
Faulty ignition lock cylinder with damaged or contaminated PASS-Key sensor coil
30%
Worn or damaged ignition key with degraded or missing transponder chip
20%
Damaged wiring harness or corroded connector between ignition cylinder and BCM/Theft Deterrent Module
15%
Failed Body Control Module or Theft Deterrent Module internal circuitry
Diagnostic Steps
1
Step 1: Perform visual inspection of the ignition key for physical damage, wear, or cracks in the transponder housing. Test with a known-good spare key if available to determine if the issue is key-specific.
2
Step 2: Inspect the ignition lock cylinder for debris, moisture, or physical damage around the PASS-Key sensor area. Remove cylinder if necessary and examine sensor coil for breaks or contamination.
3
Step 3: Using a digital multimeter, measure resistance across the PASS-Key sensor coil terminals at the ignition cylinder connector (typical values range 1-3 ohms, consult manufacturer specifications). Check for open or short circuits.
4
Step 4: Inspect wiring harness from ignition cylinder to BCM/Theft Deterrent Module for chafing, breaks, or corrosion. Pay special attention to flex points near steering column. Measure continuity and check for shorts to ground or power.
5
Step 5: Monitor live data stream for PASS-Key signal voltage or resistance value during key insertion and ignition on position. Compare readings to manufacturer specifications (typically 0.5-4.5 volts or specific resistance values).
6
Step 6: If all previous tests pass, suspect BCM/Theft Deterrent Module failure. Verify proper ground and power supply to module, then consider module replacement or reprogramming as final repair step. Clear codes and verify proper key recognition.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
DTC B2723 indicates a fault in the PASS-Key (Passive Anti-theft System) detection circuit. The Body Control Module (BCM) or Theft Deterrent Module has detected an abnormal voltage, resistance, or signal from the key transponder detection system. This prevents the vehicle's anti-theft system from pro...
The most common cause of B2723 (PASS-Key Detection Circuit) is: Faulty ignition lock cylinder with damaged or contaminated PASS-Key sensor coil
Typical repair costs for B2723 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or may stall shortly after starting, leaving you stranded. While not immediately dangerous if the vehicle is already running normally, the anti-theft system failure creates a critical no-start risk and should be repaired promptly to avoid being stranded.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2723 to identify the root cause.
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Quick Info
Category
Body
System
Anti-theft Security System
Difficulty
Type
Generic (SAE)
Recommended Tools
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