Code
B2375
HUMMER
B — Body
Keyless Entry Receiver Circuit Malfunction
AI status
Completed
Completed
100%
Causes
- Faulty keyless entry/RKE receiver module
- Damaged wiring or connectors between receiver and body/control module
- Bad ground or fused power supply to receiver
- Faulty key fob (dead battery or defective transmitter)
- Antenna or antenna amplifier fault
- Corrosion or water intrusion at connectors
Symptoms
- Remote lock/unlock does not work or works intermittently
- Must be very close to vehicle for remote to operate
- Security or anti-theft warnings or lamp illumination
- Doors do not unlock with key fob, but manual key works
- Multiple related communication or body control codes present
What to check
- Scan for B2375 and any related codes; record freeze frame and vehicle electrical state
- Verify key fob(s) operate (check with spare fob) and replace fob battery
- Inspect receiver/antenna connectors and wiring for damage, corrosion, or water ingress
- Check fuses and relay feeding the receiver circuit
- Verify receiver power supply voltage and ground at connector
- Check for CAN/LIN communication with a scan tool; verify module presence and messages
Signal parameters
- Receiver supply voltage: ~11–15 V with vehicle battery nominal (~12.6 V) and ~13.5–14.5 V with engine running
- Receiver ground: near 0 Ω to chassis ground; voltage near 0 V
- LIN bus idle: approximately battery voltage (high) when idle; check specified OEM value
- CAN bus common-mode: approx. 2.5 V per CAN high/low line at rest (differential ~0 V until active)
- Antenna/coax: continuity expected; low resistance between antenna and receiver antenna input
Diagnostic algorithm
- Retrieve and record all stored codes and related module communications using an OBD-II scanner.
- Verify operation of all key fobs. Replace the fob battery and confirm operation; try a known-good spare fob.
- Visually inspect receiver, antenna, harness, and connectors for corrosion, damage or water intrusion. Repair as needed.
- Check fuses and relays that power the receiver circuit; replace any blown fuses and retest.
- Backprobing: with appropriate safety and OEM procedures, verify receiver supply voltage and ground at the module connector.
- Check CAN/LIN communication to the body or RKE module with a scan tool. If comms are lost, trace wiring to the controlling module and check connectors.
- Test antenna continuity and resistance; inspect antenna mounting and cabling for breaks or shorts.
- Perform wiggle/strain tests on harness while observing live data or waiting for the code to set to locate intermittent failures.
- If wiring, power and comms are good but the code persists, consider reprogramming/relearning procedures per OEM and retest.
- If problem remains after wiring and programming checks, replace the receiver/antenna assembly and retest. Clear codes and verify normal operation over a drive cycle.
Likely causes
- Low or dead key fob battery causing perceived receiver failure
- Loose or corroded connector at receiver or antenna
- Blown fuse or open power feed to the receiver
- Broken antenna or coaxial lead for the keyless entry receiver
- Intermittent ground at the receiver mounting point
- Faulty receiver module (common on vehicles exposed to moisture)
Fault status
Status
Stored DTC B2375 — Keyless Entry Receiver Circuit Malfunction. Indicates fault in RKE receiver circuitry, power/ground, antenna, or communications. May cause loss or intermittent operation of remote locking/unlocking.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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Repair manuals
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138
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