What are common problems with the LB7 Duramax?

The 5 Most Common LB7 Duramax Engine Problems

• Fuel Injector Failure.
• Water Pump Failure.
• Fuel Filter Housing O-ring Leaks.
• Blown Head Gasket.
• Overheating (fan clutch problems, radiator gunk)

What happens when a Duramax goes into limp mode?

Duramax Allison Transmission Limp Mode While in limp mode, the transmission will lock in 3rd gear, the torque converter will remain unlocked, and the transmission will not be able to operate in reverse. If your transmission experienced limp mode it may be on the verge of needing a rebuild in the near future.

How do I know if my Duramax head gasket is blown?

A simple test is to put the engine under a good load at operating temperature, then shut it down and let the engine cool off for 8 hours or more. If the upper rad hose is still firm and opening the coolant reservoir cap releases air and pressure, the head gaskets have almost certainly failed.

How many miles will a LB7 Duramax last?

As we said earlier, the LB7 powered HD Sierras and Silverado’s are very reliable, and many you’ll find on the market have well over 300,000 miles on the original engine.

How do you fix a cold start problem?

How to Start the Engine

1. Turn everything off.
2. Dip the clutch when turning on the ignition.
3. Check your battery leads are clean and tightened.
4. Fill up your engine oil.
5. Bradex to the rescue.
6. Jump start.
7. Replace your battery.
8. Keep your petrol tank topped up.

How often should you change your fuel filter on a Duramax?

Change your LLY’s engine oil and filter at least once every 6 months and your fuel filters once a year. Keep an eye on your air filter and change it as needed. If you’re in very dusty areas you will likely need to change it sooner.

How much does it cost to replace a head gasket on a Duramax?

The cost to replace the head gaskets in a Duramax average is between $3,500 and $6,500. The exact price tag will depend on how long it takes to complete the job, as most of the cost is labor.

How much does it cost to replace a head gasket LB7?

For example, 2001-2004 LB7 models as well as 2004-2005 LYY models are more commonly having this issue, especially if the truck’s been driven hard and has high mileage….Duramax Head Gasket Replacement Cost.