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HOMESERVICE MANUALSCHEVROLET2018SPARK LS, STANDARD TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATIONS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U007DCIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Spark LS, Standard Trans

Circuit/System Verification

2018 Chevrolet Spark LS, Standard TransSECTION Circuit/System Verification
  1. Ignition ON/Vehicle In Service Mode.
  2. Verify that DTC U0073, U0074, U0075, U0077, U0078, U007A, P06E4, P1EB9, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1428, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Attempt to communicate with all devices on the gateway isolated low speed GMLAN serial data circuit. Refer to Data Link References  to determine which devices are on the gateway isolated low speed GMLAN bus.
  4. Verify that all gateway isolated low speed GMLAN devices are communicating.
    • If only one device is not communicating 

      Refer to Circuit/System Testing - Testing the Device Circuits.

    • If all devices are not communicating, except the K56 Serial Data Gateway Module 

      Refer to Circuit/System Testing.

    • If two or more devices are not communicating but not all, except the K56 Serial Data Gateway Module 

      Refer to Circuit/System Testing - Testing the Serial Data Circuits for an Open/High Resistance.

    • Go to next step: If all devices are communicating 
  5. All OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.