For a complete wiring diagram Refer to Section 8W.The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTCs, which indicates an internal transmission problem.When Monitored:Whenever the engine is running. The 2C clutch volume index (CVI) is updated during a 3-2 kickdown with throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).Set Condition:When the 2C CVI falls below 5.Possible CausesHYDRAULIC LEAK IN THE VALVE BODYBROKEN 2C CLUTCH PISTON RETURN SPRING / DISLODGED SNAP RINGBROKEN ACCUMULATOR SPRING(S)TRANSMISSION SOLENOID/TRS ASSEMBLYPOWERTRAIN CONTROL MODULEAlways perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) 1. OTHER DTCS PRESENTWith the scan tool, check for other transmission DTCs.Are there any Pressure Switch Sense circuit DTCs present also?YesRefer to the Transmission category and perform the appropriate symptom.NoGo To 22. CHECK 2C CLUTCH VOLUME INDEXWith the scan tool, erase Transmission DTCs.Drive the vehicle at about 80 Km/h (50 mph), then depress the OD off button. This will put the vehicle into third gear.The TRANS TEMP DEG must be at least 43° C (110° F) before performing the following steps.Perform at least ten 3-2 kickdowns by depressing the throttle between 10 and 54 TPS Degrees at speeds of about 80 Km/h (50 mph).With the scan tool, read the 2C CL VOL INDEX.Is the 2C CL VOL INDEX below 10?YesGo To 3NoGo To 53. 2C CLUTCH CIRCUIT LEAKS IN THE VALVE BODYTurn 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 2C accumulator springs .Look for possible leak paths into the 2C clutch hydraulics circuit within the valve body.Were any problems found?YesRepair as necessary.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoGo To 44. AIR CHECK 2C CLUTCH CIRCUITTurn the ignition off to the lock position.Perform an air check on the 2C Clutch circuit per the Service Information.Watch and listen for 2C Clutch piston movement.Dose the piston stroke and return properly?YesReplace the Transmission/TRS Solenoid Assembly per the service information. With the scan tool, perform Quick Learn.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoRepair internal transmission as necessary. Pay attention to the components related to the 2C clutch. A broken or dislodged 2C return spring, snap ring or broken 2C Accumulator Spring could cause this problem.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) 5. VERIFY PCM OPERATIONThe TRANS TEMP DEG must be at least 43° C or 110° F before performing the following steps.Perform eight learnable starts. A learnable start is defined as follows: Start engine. From a standstill, accelerate lightly to 80 Km/h or 50 mph, then brake lightly to a stop. Turn off engine.With the scan tool, record the CL VOL INDEX (CVI) for all clutchesWith the scan tool, perform a BATTERY DISCONNECT.With the scan tool, read the CVIs and compare them to the readings recorded before the BATTERY DISCONNECT.Are any of the CVIs less than 5 or different than before the BATTERY DISCONNECT?YesUsing 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.Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE) NoTest Complete.