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Home › Buick › 2021 › Enclave Preferred › Repair and Diagnosis › Transmission › Automatic Trans › Electronic Transmission Range Select System › Diagnostic Information and Procedures › DTC P17A7-P17A9 › Component Testing

Component Testing

  1. Ignition OFF, disconnect the X1 harness connector at the S3 Transmission Shift Lever.
  2. Test for 3 - 3.5 K Ω between the signal circuit terminal 21 and the low reference circuit terminal 20, with the Park Button Switch NOT depressed.
    • If not between 3 - 3.5 K Ω or infinite resistance 

      Replace the S3 Transmission Shift Lever and repeat step 2. If issue still occurs, replace the S156 Transmission Shift Lever Knob.

    • Go to next step: If between 3 - 3.5 K Ω 
  3. Test for 1 - 1.5 K Ω between the signal terminal 21 and the low reference circuit terminal 20, with the Park Button Switch depressed.
    • If not between 1 - 1.5 K Ω 

      Replace the S3 Transmission Shift Lever and repeat step 3. If issue still occurs, replace the S156 Transmission Shift Lever Knob.

    • Go to next step: If between 1 - 1.5 K Ω 
  4. Test for infinite resistance between each terminal and the sensor housing/case.
    • If less than infinite resistance 

      Replace the S3 Transmission Shift Lever and repeat step 4. If issue still occurs, replace the S156 Transmission Shift Lever Knob.

    • Go to next step: If infinite resistance 
  5. All OK
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