P0540..Then system shut down - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 7 (permalink) Old 01-07-2020, 09:44 AM Thread Starter
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P0540..Then system shut down

This one is quite odd and not sure if anyone has come across this.

Back in the summer, we were at Lake Havasu and it was about 110 outside. While filling up the boat, the truck was idling with the A/C on, family inside. We left the gas station and started up a hill. Power decreased and got a P0540. Looked it up and related to the intake heater voltage. I thought it was odd that it came up, it was hot outside, engine in the 190 range. Ok, checked the connections, cleared the code it was fine. But for a while, even at full temp and in the 100's outside, I'd see the voltage fluctuate while driving like the grid was going on on off. Then suddenly stopped.

Fast forward to yesterday, about 65 outside, I start the truck after work. Engine temp still about 100. Voltage going up and down, I noticed veins were hunting a little bit, and my p3 brake controller (with no trailer) would randomly flash "No Trailer". I was driving about 40 mph. Then suddenly nothing for a brief second. No radio, no gauges, like a complete reset. Didn't have to do a restart it came back up, it reset the engine oil life monitor, no codes stored and the voltage flattened out.

Anybody have any thoughts?
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post #2 of 7 (permalink) Old 01-07-2020, 10:15 AM
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How old & condition of batteries?
Fill in your sig so we can see what year of truck you have.

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post #3 of 7 (permalink) Old 01-07-2020, 10:43 AM Thread Starter
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Oh man, I thought I did a long time ago. Sorry.

2007 Classic CCLB LBZ

Batteries are just over a year old.

Last edited by Curtis Cienfuegos; 01-07-2020 at 10:52 AM.
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post #4 of 7 (permalink) Old 01-07-2020, 11:25 AM
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Check battery cable connections, check grounds on the engine and it wouldn't hurt to load test the batteries outside of the truck. I know they are only a year old, but things can happen and they can go bad. Also, maybe get the alternator checked. Low voltage can make these trucks do some VERY strange things. Could be a simple ground issue, a bad battery, or a temperamental alternator.

My LBZ has acted strange a few times. Just yesterday morning my truck wouldn't start. Drove it Saturday, everything was fine, never had a hiccup but I did see the amp gauge did something funky when I started it to drive home but then it acted fine. Didn't drive it Sunday. No start yesterday morning. Driver side battery had a loose positive terminal, passenger side battery had a loose ground terminal. Tightened the terminals, jump started it of the wife's van, all good since and batteries test good.

About a year and a half ago one evening the wife and I went out with some friends for dinner. Drove about an hour away. All was good, voltage was fine, no reason to worry. Leave dinner, message on the dash says batteries not charging, lights are dim, amp gauge is way down. Drove to local parts house, pulled the alternator off just before they close and just before it starts to trying to rain. Take it in, test it-bad alternator, no output. Installed a reman alternator from them and all happy again. Strange things happen sometimes
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post #5 of 7 (permalink) Old 01-07-2020, 11:30 AM Thread Starter
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Appreciate the feedback. You're reply just reaffirmed what I need to check. This thing has been pretty rock solid (knock on wood) until this hiccup. Should add I have 150k on the odometer. I will test the batteries and the alternator as well.

I'm amazed how long this alternators go now.

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post #6 of 7 (permalink) Old 01-07-2020, 12:08 PM
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I bet its battery or cable related . Good luck

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post #7 of 7 (permalink) Old 01-07-2020, 12:17 PM Thread Starter
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Quote:
Originally Posted by DIRTEEMAX View Post
I bet its battery or cable related . Good luck
Thank you sir.

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Factory 16" Rims/Tires, Camper Mirrors (leveled),
Fingered and Blocked
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