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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P071A >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S3 Transmission Shift Lever
  3. Test for infinite resistance between the test points: Signal terminal 1 & Ground terminal 2
    • If less than infinite resistance - Replace the component:  S3 Transmission Shift Lever
    • Go to next step: If infinite resistance 
  4. Press and hold the switch: S74 Tow/Haul Mode Switch
  5. Test for less than 5 ohms between the test points: Signal terminal 1 & Ground terminal 2
    • If less than infinite resistance - Replace the component:  S3 Transmission Shift Lever
    • Go to next step: If less than 5 ohms 
  6. All OK.
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