Diagnostic Test

1) CHECK THE 4C CLUTCH VOLUME
With the scan tool, record the 4C clutch volume index (CVI) and erase DTCs.

Perform at least 10, 3-4 upshifts with the throttle between 10 and 54 degrees. The Transmission temperature must be at least 43° C or 110° F.

With the scan tool, read the 4C CVI.

Is the current 4C CVI below 10?

Yes
1. Go to 2).
No
1. Go to 5).
2) DTC P0876 PRESENT
With the scan tool, check DTCs.

NOTE: The DTC P0876 must also be set with P2704 in order for this test to be valid.

Is the DTC P0876 also present?

Yes
1. Replace the Transmission Solenoid/TRS Assembly per the Service Information.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
No
1. Go to 3).
3) 4C CLUTCH CIRCUIT LEAKS IN THE VALVE BODY
Turn the ignition off to the lock position.

Remove the transmission oil pan per the Service Information.

Remove the valve body per the Service Information.

Check condition of the 4C accumulator springs.

Look for possible leak paths into the 4C clutch hydraulics circuit within the valve body.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
No
1. Go to 4).
4) AIR CHECK 4C CLUTCH CIRCUIT
Perform an air check on the 4C Clutch circuit per the Service Information.

Listen for proper 4C Clutch piston movement.

Were any problems found?

Yes
1. Repair Internal transmission as necessary. Pay attention to the mechanical components related to the 4th clutch. A broken or weak return spring or a dislocated snap ring could cause this problem.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
No
1. Replace the Transmission Solenoid/TRS Assembly per the service information. With the scan tool, perform Quick Learn.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
5) VERIFY PCM OPERATION
Perform eight learnable starts. A learnable start is defined as follows: Start engine. From a standstill, accelerate lightly to 50 MPH, then brake lightly to a stop. Turn off engine.

With the scan tool, record Transmission CL VOL INDEX (CVI) for all clutches.

With the scan tool, perform a BATTERY DISCONNECT.

With the scan tool, read the CVIs and compare them to the reading recorded before the BATTERY DISCONNECT.

Are any of the CVIs less than 5 or are they different than before the battery disconnect?

Yes
1. Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform Quick Learn.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
No
1. Test Complete.