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 the DTC INDEX article and perform the appropriate symptom. Perform the diagnostic procedure for DTC U0001-CAN C BUS first if it is present.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
No
- Go To 2.
- With the scan tool, read BCM DTCs.
- CHECK IF ECM/PCM DTCS ARE PRESENT
- With the scan tool, read engine DTCs.
Are there any engine DTCs present?
Yes
- Refer to the DTC INDEX article and perform the appropriate diagnostic procedure.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to 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.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
- With the scan tool, read engine DTCs.