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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 95 (ENGINE CONTROLS/FUEL - 1.8L (LUW LWE) - DTC P0010 TO DTC P0420)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0300-P0304CIRCUIT/SYSTEM VERIFICATION
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Circuit/System Verification

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine - Running
  2. Verify there is no abnormal noise from the component:Engine
    • Go to next step: If no abnormal noise is present 
  3. Perform the scan tool learn/reset function:Crankshaft Position Variation Learn
  4. Verify there are no DTCs set related to the following system/component:
    • B23 Camshaft Position Sensor
    • B26 Crankshaft Position Sensor
    • B52 Heated Oxygen Sensor
    • Fuel System
    • Ignition System
    • Mechanical Condition
    • Go to next step: If no other DTCs are set 
  5. Verify the scan tool parameter:Cylinder 1 - 4 Current Misfire Counter = Does not Increment
    • If the parameter value increments 

      Refer to: Circuit/System Testing

    • Go to next step: If the parameter value does not increment 
  6. Perform the scan tool control function:Cylinder Power Balance - Enable

    Verify the sound of the engine changes the same way when turning off each individual injector.

    • If the engine sound does not change the same way for one or more cylinders 

      Refer to: Circuit/System Testing

    • Go to next step: If the engine sound changes the same way for all cylinders 
  7. Verify the scan tool parameter:Cylinder 1 - 4 Current Misfire Counter = Does not Increment

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector:K20 Engine Control Module
    • Wiggle the harness and connector:Q17 Fuel Injector
    • Wiggle the harness and connector:K35 Ignition Coil Module
    • Wiggle the component:Vacuum Hoses
    • If not the specified state 

      Repair or replace as necessary.

    • Go to next step: If the specified state 
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC does not set 
  9. All OK.
RENDER: 1.0x

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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.