Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK TRANSMISSION FLUID LEVEL
1. Check the transmission fluid level in accordance with the Service Information. Refer to CHECK FLUID LEVEL .
  Is the transmission fluid at the correct level?
  
  Yes
  - Go To 2
  No
  - Correct the transmission fluid level.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
NOTE:
With the scan tool, read Transmission Control Module (TCM) DTCs and record the Event and Environmental Data on the repair order as it may be needed to determine the root cause of this DTC. It may be very difficult to reset this DTC so this step is very important.
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
Did the DTC return?

Yes
- Go To 3
No
- Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK TRANSMISSION FLUID CONDITION
1. Check the Transmission fluid condition.
  Is the Transmission fluid burnt?
  
  Yes
  - Remove the Transmission and perform the appropriate repair for this DTC in accordance with the Service Information. Refer to 8HP50/850RE TRANSMISSION, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .
  No
  - Replace the Valve Body in accordance with the Service information. Refer to 8HP50/850RE, VALVE BODY, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .