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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 492 (Automatic Transmission Diagnostic Procedures) >> Diagnostic Information And Procedures >> Transmission - RFE - Symptoms >> Symptom: *TRANSMISSION NOISY WITH NO DTC'S PRESENT >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TEST REFERENCE - TRANSMISSION NOISY WITH NO DTC'S PRESENT

TEST ACTION APPLICABILITY
1 Check and adjust the oil level per the service information before continuing.
Place vehicle on hoist.
Run vehicle on hoist under conditions necessary to duplicate the noise.
Using Chassis Ears or other suitable device, verify that the noise is coming from the transmission.
Is the noise coming from the transmission?
Yes --> Go To 2
No --> Refer to the Service Information for the proper repair procedure. Check for any TSBs that may apply.
Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .		 All
2 Check the Transmission Fluid level per the Service Information.
NOTE: The transmission must be hot when checking oil level. When the temperature is below 10°Celsius 50°Fahrenheit it is possible that no oil will show on the dipstick, even though the transmission has an adequate fill level when warm.

Is the fluid level OK?
Yes --> Go To 3
No --> Adjust fluid level. Repair cause of incorrect fluid level.
Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .		 All
3 With the shift lever in neutral, raise the engine speed and listen to the noise.
NOTE: Make sure the radio is turned OFF. Alternator noise can come through the speakers and be misinterpreted as Transmission Pump Whine. This can happen even with the volume turned down, THE RADIO MUST BE TURNED OFF.

Does the noise get louder or change pitch while the engine speed is changing?
Yes --> Go To 4
No --> Go To 5		 All
4 If there are no possible causes remaining, view repair.
Repair
Repair internal transmission as necessary per the Service Information. Pay particular attention to the bearings in front half of transmission and for any signs of wear. If no problems are found, replace the primary oil pump.
Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .		 All
5 If there are no possible causes remaining, view repair.
Repair
Repair internal transmission as necessary per the Service Information. Inspect all of the transmission components for signs of wear. Pay particular attention to bearings, pinion gears, etc. Repair or replace as necessary.
Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .		 All
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