Code
B2310
HUMMER
B — Body
Hand Set Failure
AI status
Completed
Completed
100%
Causes
- Blown fuse or lost power feed to handset
- Poor ground or high resistance in ground circuit
- Damaged handset (microphone/speaker/button assembly)
- Corroded or loose connector(s) at handset or harness
- Open or short in handset wiring harness
- Faulty body control / infotainment module or handset interface module
Symptoms
- Hands-free handset does not power on or respond
- No audio (incoming or outgoing) through handset
- Buttons on handset are unresponsive or behave intermittently
- Error message or icon on cluster/infotainment referencing handset or phone failure
- Bluetooth/hands-free functions unavailable or limited
- Multiple related DTCs present (communication or phone subsystem errors)
What to check
- Retrieve all stored DTCs with a capable scan tool; record freeze frame and current data
- Visually inspect handset, connectors, and harness for corrosion, damage, or water intrusion
- Verify relevant fuses and fusible links for continuity
- Check for proper battery voltage at the handset power pin(s) with ignition ON (see signal_params)
- Check ground continuity from handset ground to chassis (low resistance)
- Wiggle harness and connectors while observing live data to reproduce an intermittent fault
Signal parameters
- Battery supply (key ON): ~11–14 V present at handset power pin
- Ground: continuity to chassis, resistance ideally
- CAN bus idle voltage: each CAN_H/CAN_L ~2.5 V (differential ~0 V idle) — modules should see normal CAN traffic
- Data/serial communication: data frames for hands-free subsystem present on scan tool (packets and expected IDs)
- Speaker/mic element checks: speaker continuity varies by design (check manufacturer spec); microphone bias if applicable present
Diagnostic algorithm
- Verify symptom and scan for DTC B2310 and any related codes; record all module IDs and descriptions.
- Inspect handset, mounting, and visible harness for damage, corrosion, or water entry; repair or clean connectors as needed.
- Check fuses and power feed: verify battery voltage at handset power pin with ignition ON; if absent, trace back to fuse and harness.
- Verify ground: measure resistance from handset ground pin to chassis ground; repair high-resistance ground.
- With scan tool, monitor data-bus traffic and verify the handset/phone module is present on CAN/LIN and exchanging messages; note communication errors.
- Perform wiggle test on handset harness and connector while watching live data and listening for symptom changes to locate intermittent wiring faults.
- If power/ground and wiring are good but communication fails, attempt a software reset/reflash of the infotainment or handset interface module per manufacturer service information.
- If software update/reset doesn’t restore function, bench-test or replace the handset assembly with a known-good unit and verify operation.
- If replacement solves the issue, reassemble and clear codes. If not, continue diagnosing upstream modules, harness, or body control module.
- After repair, clear codes and perform functional verification under all expected operating conditions; monitor for recurrence.
Likely causes
- No battery power to handset due to fuse or wiring fault
- Connector corrosion or pin damage causing intermittent or no connection
- Handset internal failure (speaker, mic, or circuit board)
- Loss of CAN/LIN communication between handset and control module
- Module software lockup requiring reprogramming or reset
Fault status
Status
Manufacturer-specific body code indicating the vehicle detected a malfunction in the handset (hands-free/telephone) circuit or module. May be caused by power/ground loss, communication failure, or internal handset fault. Further diagnostic steps required to isolate root cause.
Repair difficulty: Medium
Diagnostic time: 0.8-2.5 hours
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Repair manuals
Manual library for HUMMER
138
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