What Does B1874 Mean?
This code indicates that the Body Control Module (BCM) or infotainment system has detected that a cellular phone handset is not present in its cradle or docking station. This is part of an integrated hands-free phone system where the vehicle expects to communicate with a phone module but cannot detect it. The system monitors the phone cradle connection status and sets this code when the handset is missing or the connection is interrupted.
Common Causes
45%
Phone handset physically removed from cradle or not properly seated in docking station
30%
Faulty or damaged phone cradle connector pins or docking station
15%
Wiring harness damage or connector corrosion between phone cradle and BCM
10%
Failed BCM or communication module not detecting handset presence signal
Diagnostic Steps
1
Step 1: Visually inspect the phone cradle/docking station for presence of handset and verify it is properly seated and locked into position according to manufacturer specifications
2
Step 2: Remove handset and inspect cradle connector pins for damage, bent pins, debris, or corrosion; clean contacts with electrical contact cleaner if necessary
3
Step 3: Using a multimeter, check for continuity and proper voltage (typically 5V or 12V reference) at the phone cradle connector with ignition on; compare readings to vehicle-specific wiring diagrams
4
Step 4: Inspect wiring harness from phone cradle to BCM for chafing, pinching, or damaged insulation; check all intermediate connectors for corrosion and proper seating
5
Step 5: Reinstall handset properly, clear the code, and verify system operation; monitor for code recurrence and confirm BCM recognizes handset presence through scan tool live data
Estimated Repair Cost
$0 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or infotainment system has detected that a cellular phone handset is not present in its cradle or docking station. This is part of an integrated hands-free phone system where the vehicle expects to communicate with a phone module but cannot dete...
The most common cause of B1874 (Cellular Phone Handset Not Present) is: Phone handset physically removed from cradle or not properly seated in docking station
Typical repair costs for B1874 range from $0 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability and it is completely safe to continue driving. This is a convenience feature fault that only impacts hands-free phone functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1874 to identify the root cause.
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Quick Info
Category
Body
System
Comfort/Convenience Systems - Integrated Hands-Free Phone System
Difficulty
Type
Manufacturer
Recommended Tools
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