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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 162 (Data Communications - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC U1970-1972 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
  2. Ignition ON/Vehicle In Service Mode.
  3. Verify DTC U1971 is not set.
    • If the DTC is set 

      Replace the K212 Gear Shift Control Module.

    • Go to next step: If the DTC is not set 
  4. Verify DTC U0073-U007E, U0100-U02FF, U1100-U12FF, U1600-U17FF, U1977, U1978, U2200-U23FF, or U2400-U25FF is not set.
    • Go to next step: If none of the DTCs are set 
  5. Verify DTC U1970 is not set.
    • If the DTC is set 
    1. Perform the Serial Data Authentication Configuration procedure in SPS. Refer to Serial Data Authentication Configuration .
    2. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
    3. Ignition ON/Vehicle In Service Mode.
    4. Verify the DTC does not set.
      • If the DTC sets, replace the K212 Gear Shift Control Module.
      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If the DTC is not set 
  6. Verify DTC U1972 is not set.
    • If the DTC is set along with DTCs U0400-U05FF, U1300-U14FF, or U2500-U25FF 
    1. Perform the Serial Data Authentication Configuration procedure in SPS. Refer to Serial Data Authentication Configuration .
    2. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
    3. Ignition ON/Vehicle In Service Mode.
    4. Verify the DTC does not set.
      • If the DTC sets, program the control module that the majority of control modules set invalid data DTCs against. If the DTC resets, replace the control module that was just programmed.
      • Go to next step: If the DTC does not set
    5. All OK.
    • If the DTC is set without DTCs U0400-U05FF, U1300-U14FF, and U2500-U25FF 
    1. Perform the Serial Data Authentication Configuration procedure in SPS. Refer to Serial Data Authentication Configuration .
    2. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
    3. Ignition ON/Vehicle In Service Mode.
    4. Verify the DTC does not set.
      • If the DTC sets, replace the K212 Gear Shift Control Module. Perform the Serial Data Authentication Configuration procedure again. If the DTC resets, contact Technical Assistance Center for further instructions.
      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If the DTC is not set 
  7. All OK
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