Code
B0126
Generic
B — Body
Driver Monitoring Camera
AI status
Completed
Completed
100%
Causes
- Contaminated, obstructed, or damaged camera lens
- Loose, corroded, or damaged camera connector or wiring
- Camera module internal failure
- Loss of power or ground to the camera
- Faulty vehicle network communication (CAN/LIN) to camera or BCM
- Calibration or software corruption/requirement
Symptoms
- Driver monitoring system warning or message on dash
- Driver assistance functions that rely on driver monitoring disabled (e.g., distraction/warning)
- Yellow or red warning indicator illuminated
- No camera image in diagnostic tool or camera feed blank/distorted
- Intermittent operation of driver alerts
What to check
- Scan vehicle and record B0126 plus any related codes and freeze frame data
- Visually inspect camera lens and windshield area for contamination or obstruction
- Check camera connector for corrosion, bent pins, moisture, or loose latch
- Verify fuses and power/ground at camera connector with a DVOM
- Confirm vehicle communication (CAN/LIN) is healthy using a scan tool
- Attempt to view live camera feed with factory scan tool if available
Signal parameters
- Camera supply voltage: nominal 12 V (or vehicle-specific 5 V reference) at connector
- Ground continuity to chassis ground
- Video signal or image stream present on camera data lines (check with scope or factory tool)
- CAN/LIN message traffic from camera device ID present and valid
- Module diagnostic code reporting frequency / occurrence (intermittent vs permanent)
- Camera internal temperature / status bytes if available from the module
Diagnostic algorithm
- Read and record DTCs and freeze frame data with a capable scan tool; note related network codes.
- Clear codes, cycle ignition, and see if B0126 returns to check intermittent behavior.
- Visually inspect camera lens and windshield mounting area; clean lens and remove any obstruction.
- Inspect camera connector and wiring harness (A‑pillar/windshield area) for damage, water ingress, or pin push‑outs.
- With connector connected, verify camera supply voltage and ground at the connector; backprobe if required.
- Verify camera data/video signal or CAN/LIN messages using a scope or factory diagnostic tool; look for valid packets and IDs.
- Wiggle test harness while watching live data to reproduce intermittent faults.
- If wiring and power good but no valid data, replace camera module or module harness per OEM procedure.
- After replacement, perform required programming and camera calibration (relearn) with factory tool.
- Confirm repair by clearing codes and performing a road test or system verification; monitor for return of the code.
- If problem persists, consult OEM service information/TSBs and consider network module diagnostics (BCM/ECM) or intermittent wiring faults.
Likely causes
- Connector backshell not fully seated or bent pins at camera harness
- Break or chafe in camera video/communication wiring (near A-pillar)
- Failed camera image sensor or internal electronics
- Blown fuse or intermittent 12 V/5 V supply to camera
- Software mismatch after module replacement or missing camera calibration
- Lens blocked by tint, adhesive, or debris on windshield
Fault status
Status
Driver Monitoring Camera — camera signal invalid or communication fault. Driver monitoring features may be disabled until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
Similar codes
Repair manuals
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Code
B0126
HUMMER
B — Body
Right Panel Discharge Temperature Fault
AI status
Completed
Completed
100%
Causes
- Contaminated, obstructed, or damaged camera lens
- Loose, corroded, or damaged camera connector or wiring
- Camera module internal failure
- Loss of power or ground to the camera
- Faulty vehicle network communication (CAN/LIN) to camera or BCM
- Calibration or software corruption/requirement
Symptoms
- Driver monitoring system warning or message on dash
- Driver assistance functions that rely on driver monitoring disabled (e.g., distraction/warning)
- Yellow or red warning indicator illuminated
- No camera image in diagnostic tool or camera feed blank/distorted
- Intermittent operation of driver alerts
What to check
- Scan vehicle and record B0126 plus any related codes and freeze frame data
- Visually inspect camera lens and windshield area for contamination or obstruction
- Check camera connector for corrosion, bent pins, moisture, or loose latch
- Verify fuses and power/ground at camera connector with a DVOM
- Confirm vehicle communication (CAN/LIN) is healthy using a scan tool
- Attempt to view live camera feed with factory scan tool if available
Signal parameters
- Camera supply voltage: nominal 12 V (or vehicle-specific 5 V reference) at connector
- Ground continuity to chassis ground
- Video signal or image stream present on camera data lines (check with scope or factory tool)
- CAN/LIN message traffic from camera device ID present and valid
- Module diagnostic code reporting frequency / occurrence (intermittent vs permanent)
- Camera internal temperature / status bytes if available from the module
Diagnostic algorithm
- Read and record DTCs and freeze frame data with a capable scan tool; note related network codes.
- Clear codes, cycle ignition, and see if B0126 returns to check intermittent behavior.
- Visually inspect camera lens and windshield mounting area; clean lens and remove any obstruction.
- Inspect camera connector and wiring harness (A‑pillar/windshield area) for damage, water ingress, or pin push‑outs.
- With connector connected, verify camera supply voltage and ground at the connector; backprobe if required.
- Verify camera data/video signal or CAN/LIN messages using a scope or factory diagnostic tool; look for valid packets and IDs.
- Wiggle test harness while watching live data to reproduce intermittent faults.
- If wiring and power good but no valid data, replace camera module or module harness per OEM procedure.
- After replacement, perform required programming and camera calibration (relearn) with factory tool.
- Confirm repair by clearing codes and performing a road test or system verification; monitor for return of the code.
- If problem persists, consult OEM service information/TSBs and consider network module diagnostics (BCM/ECM) or intermittent wiring faults.
Likely causes
- Connector backshell not fully seated or bent pins at camera harness
- Break or chafe in camera video/communication wiring (near A-pillar)
- Failed camera image sensor or internal electronics
- Blown fuse or intermittent 12 V/5 V supply to camera
- Software mismatch after module replacement or missing camera calibration
- Lens blocked by tint, adhesive, or debris on windshield
Fault status
Status
Driver Monitoring Camera — camera signal invalid or communication fault. Driver monitoring features may be disabled until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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