GMC Yukon XL 2000–2006
Common on this vehicle:Air conditioning or heaterLeakShifting fault
Possible causes
The documents say what to doOnly records name itThe size of a node, the width of a link and the numbers are records matching this search, not likelihoods.
FaultCrate・GMC Yukon XL 2000–2006・Shifting fault
Candidate cause (the documents say what to do)
4L60-E burnt 3-4 clutch pack
Low line pressure and/or leaks of 3rd gear oil are the root cause of most 3-4 slipping.
Small leaks at several points in the circuit can add up to enough pressure loss to allow slipping.
What to do
- Test the 3rd accumulator checkball capsule for leakage; a leaking capsule is a leading cause of 3-4 clutch failure.
- Whenever a burnt clutch pack is found, inspect all three circuits methodically to find and eliminate all leaks.
- Thicker heavy-duty backing plates that eliminate clutch pack flex are available in the aftermarket.
Caution: An obvious leak such as a cracked apply piston should not stop further investigation.
In the records
No record states work done for this cause.
See the evidence (1 technical documents, 0 records)
Passages of the technical documents
Burnt 3-4 clutch packs are notoriously common in the GM 4L60/E family of transmissions.
Sonnax 2018-06-06
Low line pressure and/or leaks of 3rd Gear oil are the root cause of most 3-4 slipping.
Sonnax 2018-06-06
even small leaks at a few junctions along the way can add up to a big enough pressure loss to allow slipping.
Sonnax 2018-06-06
The weak OE 3-4 backing plate flexes during application, allowing heat to build up unevenly within the clutch pack’s limited space.
Sonnax 2018-06-06
A cause or a result a complaint states is the owner’s view or what a dealer told them, not an established fact.
Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.