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How can you tell lly?
If the 8th digit of your VIN number is a 1, then it is a LB7 Duramax (the early engine). If the 8th digit is a 2, then it is a LLY. In mid 2004, GM switched to this newer LLY engine.
What causes a Duramax to go into limp mode?
Duramax Allison Transmission Limp Mode
In some cases such as a heavy load, towing, down shifting to pass, etc, and is especially common in performance tuned trucks can cause enough transmission slippage to trigger limp mode.
What does LLY stand for on Duramax?
LLY doesnt stand for anything specific, its just the RPO (regular production order) code that means “Duramax diesel engine“.
What’s the difference between LLY and LBZ?
The ’06 LLY is much quieter than the ’05. The ’06 LLY and LBZ have the same turbo (ask McRat, he put one on his ’05 LLY). It has the reduced compression, meaning that it has the LBZ pistons. If the LBZ piston has an increased wristpin diameter, then it stands to reason that the ’06 LLY also has the LBZ rods.
How do I know what type of Duramax I have?
Duramax Diesel engine RPO codes include:
- LB7. VIN Digit: 1. …
- LLY. VIN Digit: 2. …
- LBZ. VIN Digit: D. …
- LMM. VIN Digit: 6 for 2500/3500 pickups and vans, 9 for 4500/5500 Cab and Chassis Silverado, Sierra, TopKick or Kodiak. …
- LML. VIN Digit: 8. …
- LGH. VIN Digit: L.
Which Duramax do I have?
Duramax VIN Decoder Chart
|Model Year(s)||8th Digit of VIN||Duramax Model & Notes|
|2001 – 2004||1||LB7|
|2||LLY (introduced midyear 2004)|
|2005||2||LLY (only engine offered for 2005)|
|2006||2||LLY (2006 version, different from 2005 version)|
Is an LLY reliable?
For those towing frequently or in hot climates, upgrade the turbo inlet as it can lead to expensive head gasket replacement. LLY’s are great diesels that have consistently proved to be highly reliable up to the 300k mark.
How long will a LLY Duramax last?
Most well-maintained LLY injectors last between 150,000 to 200,000 miles.
What year Duramax has head gasket problems?
The 2006-2010 riveted gaskets are the only ones that don’t follow this pattern, because they do leak externally when they fail and rarely cause this over-pressurization. However, these will often have coolant puddles on the ground when the truck is parked overnight, making it easy to see that there is an issue.