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Home >> GMC >> 2025 >> Sierra 2500 HD Denali Ultimate >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Driver Assistance Systems >> Diagnostic Information and Procedures >> DTC U3000 (B218L Side Obstacle Detection Control Module - Left or B218R Side Obstacle Detection Control Module - Right) >> Circuit/System Testing

Circuit/System Testing

DTC U3000 with failure type byte 00, 41, or 42 

  1. Verify that the DTC is not set with FTB 00, 41, or 42.
    • If the DTC is set 

      Replace the B218 Side Obstacle Detection Control Module that is setting the DTC.

    • Go to next step: If the DTC is not set 
  2. All OK.

DTC U3000 49, U3000 54, or U3000 57 

  1. Ignition ON.
  2. Verify DTC U3000 is not set with FTB 49, 54, or 57
    • If the DTC is set 
    1. Program the B218 Side Obstacle Detection Control Module that is setting the DTC.
    2. Verify the DTC does not reset.
      • If the DTC resets, replace the B218 Side Obstacle Detection Control Module that is setting the DTC.
      • Go to next step: If the DTC does not reset
    3. All OK.
    • Go to next step: If the DTC is not set 
  3. All OK.

DTC U3000 4B 

  1. Verify that the ambient temperature around the module is less than 85°C (185°F).
    • If the ambient temperature is above 85°C (185°F) 
    1. Allow the area around the control module to cool below 85°C (185°F).
    2. Clear the DTC. Operate the vehicle under the conditions for running the DTC.
    3. Verify the DTC does not reset.
    • If the DTC resets, replace the B218 Side Obstacle Detection Control Module that is setting the DTC.
    • Go to next step: If the DTC does not reset

      Go to next step: All OK.

    • Go to next step: If the ambient temperature is below 85°C (185°F) 
  2. Clear the DTC. Operate the vehicle under the conditions for running the DTC.
  3. Verify the DTC does not reset.
    • If the DTC resets, replace the B218 Side Obstacle Detection Control Module that is setting the DTC.
    • Go to next step: If the DTC does not reset
  4. All OK.

DTC U3000 56, U3000 76, or U3000 78 

  1. Ignition ON.
  2. Verify DTC U3000 56, U3000 76 or U3000 78 are not set.
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC is set 
  3. Verify that there is no fascia damage, deformation, or misalignment. Repair as needed.
  4. Verify that the radar module is properly and securely mounted in position.
  5. Program the B218 Side Obstacle Detection Control Module that is setting the DTC.
    6. NOTE:

    Conditions do not need to be continuous, but must accumulate to 10 minutes.

  6. Test drive vehicle for a minimum of 10 min to allow automatic alignment learn to occur. Test drive should include the following:
    • Speed as least 6.2 mph (10 kph)
    • Straight Driving (no turn inputs)
    • Road side infrastructure objects present (such as trees, fences, signs, walls, buildings)
  7. Verify scan tool Correction Angle Learn Status is COMPLETE.
    • If Correction Angle Learn Status is LEARN IN PROGRESS 

      Continue test drive.

    • If Correction Angle Learn Status is COMPLETE 

      All OK.

    • Go to next step: If Correction Angle Learn Status is RESET FAILED 
  8. Verify the DTC does not reset.
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC is set 
  9. Replace the B218 Side Obstacle Detection Control Module that is setting the DTC.

DTC U3000 97 

  1. Ignition ON.
  2. Verify DTC U3000 97 is not set.
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC is set 
  3. Verify there is no external object or debris blocking the sensor such as dirt, mud, snow, or salt, present on the fascia surface. Clean as necessary
  4. Verify none of the following conditions exist or previously existed when the DTC was set: radar blocked by a bicycle rack, trailer, bumper stickers, cargo, coverings, or other equipment/objects in radar field of view. Remove if equipped.
  5. Ignition/Vehicle - Off for greater than 5 min with scan tool disconnected
  6. Clear DTCs.
  7. Operate the vehicle under the conditions for running the DTC.
  8. Verify the DTC does not reset.
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC is set 
  9. Verify that the B218 Side Obstacle Detection Control Module is properly and securely mounted in position.
  10. Verify that there is no internal blockage, such as dirt, mud, snow, ice, or other objects, between radar face and inner fascia surface.
    • If no mounting or blockage issues found 

      Replace the B218 Side Obstacle Detection Control Module that is setting the DTC.

    • Go to next step: If mounting or blockage issues found and resolved 
  11. Ignition/Vehicle - Off for greater than 5 min with scan tool disconnected
  12. Clear DTCs.
  13. Operate the vehicle under the conditions for running the DTC.
  14. Verify the DTC does not reset.
    • If the DTC is not set 

      All OK.

    • Go to next step: If the DTC is set 
  15. Replace the B218 Side Obstacle Detection Control Module that is setting the DTC.
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