Explorer AWD V8-4.6L (2010)
Valve Body: Customer Interest
A/T - Whistling Noise When Hot
TSB 09-21-4
11/02/09
5R555 TRANSMISSION - WHISTLE NOISE WHEN HOT
FORD:
2009-2010 Explorer Sport Trac, Explorer
MERCURY:
2009-2010 Mountaineer
This article supersedes TSB 09-12-5 to update the Service Procedure and Part List.
ISSUE
Some 2009-2010 Explorer, Mountaineer and Explorer Sport Trac vehicles equipped with a 5R55S transmission may exhibit a high frequency whistle
noise at idle in any gear position with the transmission fluid temperature at or above 170 degrees Fahrenheit (76 degrees Celsius).
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Install IDS/PDS or equivalent.
2. Verify that the transmission fluid temperature (TFT) PID is above 170 °F (76 °C).
a. If it is not at 170 °F (76 °C), drive unit approximately 3 miles (5 Km) to reach temperature.
b. If it is at 170 °F (76 °C), proceed to Step 3.
3. Return vehicle to idle and verify high frequency whistle noise is present in all gear selector positions (P-R-N-D-L). While Vehicle is at idle in park
increase engine RPM by 150 to 200 RPM's the whistle noise will go away.
a. If the above whistle condition can be verified in all gears proceed Step 4.
b. If the whistle condition cannot be verified or is not present in all selector gear positions please follow the normal diagnostic routine procedures
outlined in the Workshop Manual (WSM), Section 307-01.
4. Replace the main control separator plate following the WSM, Section 307-01A for Main Control Removal and Disassembly and Assembly of
Subassemblies Main Control Valve Body.
