Code
B2862
HUMMER
B — Body
Keyless Entry Antenna Circuit Fault
Views:
UK: 10
EN: 16
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in the keyless entry antenna wiring
- Loose, corroded or damaged antenna connector
- Failed keyless entry antenna module/antenna assembly
- Faulty Body Control Module (BCM) or receiver module
- Water intrusion or physical damage at the antenna
- Aftermarket electronics or RF interference
Symptoms
- Passive/keyless unlock/lock does not operate or is intermittent
- Door will only lock/unlock with mechanical key or remote buttons
- Keyless entry operation range greatly reduced
- Possible instrument cluster message or security warning
- One or more related DTCs stored for keyless entry/receiver circuits
What to check
- Retrieve B2862 and related DTCs and note freeze-frame/store data
- Verify key fob battery and try a known-good key fob
- Visual inspection of antenna, connectors and wiring for damage or corrosion
- Backprobe antenna connector: check for battery/supply voltage and good ground
- Continuity/resistance check from antenna connector to BCM connector
- Check for intermittent faults by wiggling harness while monitoring DTC status
Signal parameters
- Antenna supply voltage: approx. battery voltage when powered (around 12 V nominal)
- Ground continuity: near 0 ohms between antenna ground and chassis ground
- Antenna element continuity: not open (continuity present) or not shorted to ground/power
- Module communications: presence of expected LIN/CAN messages to BCM when available
- RF receive metrics (if available): RSSI or key detection events should be present when fob is nearby
Diagnostic algorithm
- Use a scan tool to read DTC B2862 and any related codes; record freeze-frame data and attempt to reproduce the fault.
- Confirm fob battery and test with another known-good fob to rule out key-side issue.
- Visually inspect the antenna assembly, mounting, connectors and routing for corrosion, water entry or damage.
- With ignition off, disconnect the antenna connector and inspect pins for corrosion, bent pins, or moisture; clean and reassemble.
- Backprobe the antenna connector with ignition on (or as specified by OEM) and verify supply voltage and ground presence. Compare to vehicle battery voltage.
- Perform continuity and resistance checks from the antenna connector to the BCM/receiver connector. Repair any open or high-resistance circuits.
- Check for shorts to ground or battery with an ohmmeter between signal/supply wires and ground/power (battery disconnected as required).
- If wiring and connectors are good, substitute or bench-test the antenna module per OEM procedure or temporarily swap with a known-good unit if available.
- If antenna replacement repairs the issue, clear codes and verify proper operation and no recurrence after cycling locks and testing range.
- If fault persists after antenna replacement, follow BCM diagnostic procedures – check BCM power/ground, communications and software level, and consult wiring diagrams for further module-level tests.
Likely causes
- Corroded or disconnected antenna connector at the antenna or BCM
- Open/short in antenna signal or supply wire (chafe, pinched harness)
- Antenna assembly failure (internal open or shorted element)
- Intermittent ground or poor chassis ground near antenna module
Fault status
Status
Keyless entry antenna circuit fault detected — antenna supply, ground, signal or communications out of expected range or intermittent.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email