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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P071A: Transmission Tow Mode Switch Circuit >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. 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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