Diagnostic Test
- CHECK FOR BCM CAN BUS DTCS
- With the scan tool, read BCM DTCs.
Are there any BCM CAN BUS DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING and perform the appropriate symptom. Perform the diagnostic procedure for DTC U0001-CAN C BUS first if it is present.
- Refer to STANDARD PROCEDURE and perform NAG1 TRANSMISSION VERIFICATION TEST.
No
- Go To 2.
- With the scan tool, read BCM DTCs.
- CHECK IF HVAC DTCS ARE PRESENT
- With the scan tool, read HVAC DTCs.
Are there any HVAC DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING and perform the appropriate symptom.
- Refer to STANDARD PROCEDURE and perform NAG1 TRANSMISSION VERIFICATION TEST.
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information.
- Refer to STANDARD PROCEDURE and perform NAG1 TRANSMISSION VERIFICATION TEST.
- With the scan tool, read HVAC DTCs.