Code
B2483
HUMMER
B — Body
Global Positioning System (GPS) Antenna Circuit
Views:
UK: 7
EN: 25
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or short in GPS antenna coax or wiring
- Corroded or loose antenna connector
- Failed or water-damaged GPS antenna (active or passive)
- Loss of antenna supply voltage or blown fuse
- Poor ground or chassis connection at module or antenna
- Intermittent connector contact or broken wire due to vibration
Symptoms
- Navigation system shows no satellite lock or no GPS signal
- Incorrect or drifting vehicle position
- Slow time to first fix (TTFF) or intermittent GPS reception
- Navigation-related error message or warning in the infotainment display
- Related vehicle features that use GPS (telematics, emergency location) not functioning
What to check
- Retrieve freeze frame and freeze data with a scan tool; note environmental and ignition state
- Visually inspect GPS antenna, roof module, connectors and coax routing for damage or water entry
- Check for corrosion or bent pins at antenna and module connectors
- Verify related fuses and power feeds with ignition in ACCESSORY/ON
- Backprobe antenna feed to measure supply voltage at connector
- Check continuity of coax center conductor and shield between antenna and module
Signal parameters
- Antenna supply voltage: typically in the 3–5 VDC range when biased (check vehicle-specific spec)
- Coax center-to-module continuity: low resistance (near 0 Ω for continuity); open indicates break
- Coax center-to-shield: should not be a direct short (shorts < 1 Ω indicate failure)
- RF path impedance: nominally ~50 Ω (requires RF test equipment to measure)
- Module-reported GPS signal: no satellites or low SNR reported when fault present
Diagnostic algorithm
- Read and record DTCs and freeze frame data with a scan tool. Clear codes and attempt to reproduce; note if code returns.
- Visually inspect the GPS antenna housing, mounting, and routing for physical damage, water intrusion, or corrosion.
- Inspect connectors at the antenna and infotainment/navigation module. Disconnect, clean contacts with appropriate electrical contact cleaner, and reseat.
- With ignition ON (accessory), backprobe the antenna power/bias lead and verify expected bias voltage per vehicle spec (usually 3–5 V). If no voltage, trace fuse and wiring back to source.
- Check continuity of the coax center conductor from the antenna connector to the module. An open indicates a broken conductor; a short to shield indicates coax failure.
- Check shield continuity to chassis ground. Excessive resistance or intermittent readings indicate poor ground or connector corrosion.
- If wiring and power are good but no GPS reception, substitute a known-good GPS antenna or use a temporary pigtail to isolate antenna vs. module fault.
- If substitution confirms antenna failure, replace antenna and retest. If substitution does not restore function, suspect module/bias circuit and proceed with module-level diagnostics or replacement per vehicle procedures.
- Check for recent aftermarket installations or repairs (head unit, amplifier, roof rack) that could interfere with antenna routing; correct as needed.
- After repair, clear DTCs and verify normal GPS acquisition and that the B2483 code does not return.
Likely causes
- Disconnected or loose antenna connector at roof/antenna module
- Damaged or pinched coax cable (open or short to shield)
- Water ingress at antenna or connector causing corrosion
- Failed active GPS antenna (no output / failed amplifier)
- Blown accessory fuse or missing power feed to antenna bias
Fault status
Status
GPS antenna circuit fault — antenna feed, power, or connection is out of specification; may result in no or poor satellite reception.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
HTML Workshop Manuals AI manual library for HUMMER Click to show available manuals 8
HUMMER 2010 Hummer H3 Alpha
HTML ManualHUMMER 2010 Hummer H3 Base
HTML ManualHUMMER 2010 Hummer H3 Base
HTML ManualHUMMER 2010 Hummer H3 L5-3 3.7L
HTML ManualHUMMER 2010 Hummer H3 V8-5 V8-5.3L
HTML ManualHUMMER 2010 Hummer H3T Alpha
HTML ManualHUMMER 2010 Hummer H3T Base
HTML ManualHUMMER 2010 Hummer H3T Base
HTML ManualYour 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