Duramax Diesels Forum Truck of the Week
  #1  
Old 09-09-2009, 06:16 PM
ronsway ronsway is offline
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Default P0540 code.

2002, 2500HD, 4X4, auto - I am getting a P0540 code. I have heard that it is the IAH relay. What can I do to further determine the problem? Is this something a "bolt-on" mechanic is try to fix?
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Old 09-09-2009, 06:19 PM
Mike Mike is offline
hmmm....
 
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That could be anything from a bad fuse to a bad heater coil. Time for a volt/ohm meter.
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Old 09-09-2009, 06:41 PM
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sweetdiesel sweetdiesel is offline
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That is what the code is for

If the temp of the truck is under 121f and or intake air temp is below73f it will kick on the heater coil

Check the voltage on the heater coil and that will tell us where to start,there is also a wire on the glowplug controller that need to be checked that will elimnate the wire to the plug being the issue
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Old 09-09-2009, 06:43 PM
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sweetdiesel sweetdiesel is offline
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Check Ing 1 fuse in the under hood fuse block
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07 RC/LB 2wd
A/D lift pump,Tunes from Josh H, BD Manifold and custom up pipes, P&I supports, PPE tie rod sleeves

05 CC/LB
EFI ,A/D lift pump,Cognito 7"lift /P&I supports / Banks air and exaust /ARP head studs/ Mike L stage 4 trans / EPR twins.

Abby 01 RC/LB 10.28@144mph
Arias pistons/ Howards rods / S475 & PBK twin turbos from EPR/PPE 2 CP3 / SoCal stg 2 heads & cam / 100 over sticks /Socal flexplate & dampner & girdle /DPR oil pump / Lenco-bruno trans /BD intercooler / Ted at MPL / turbo blankets from Levi
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Old 09-09-2009, 06:44 PM
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sweetdiesel sweetdiesel is offline
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Quote:
Originally Posted by Mike View Post
That could be anything from a bad fuse to a bad heater coil. Time for a volt/ohm meter.

Also can mean a bad ECM
__________________
07 RC/LB 2wd
A/D lift pump,Tunes from Josh H, BD Manifold and custom up pipes, P&I supports, PPE tie rod sleeves

05 CC/LB
EFI ,A/D lift pump,Cognito 7"lift /P&I supports / Banks air and exaust /ARP head studs/ Mike L stage 4 trans / EPR twins.

Abby 01 RC/LB 10.28@144mph
Arias pistons/ Howards rods / S475 & PBK twin turbos from EPR/PPE 2 CP3 / SoCal stg 2 heads & cam / 100 over sticks /Socal flexplate & dampner & girdle /DPR oil pump / Lenco-bruno trans /BD intercooler / Ted at MPL / turbo blankets from Levi
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  #6  
Old 09-09-2009, 06:52 PM
Mike Mike is offline
hmmm....
 
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I didn't know that. Thanks
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2004 lb7 2500 cclb 4x4 <- Wrecked / repairing for daughters ride.

2005 LLY 3500 cc 4x4 <- Gone

2007 lmm excb 4x4 dually GMC <- Gone

2015 LML cclb 4x4 dually GMC Tow hog
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  #7  
Old 09-09-2009, 06:57 PM
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sweetdiesel sweetdiesel is offline
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Quote:
Originally Posted by Mike View Post
I didn't know that. Thanks

probably rare Mike,but it happend to a friend of mine
__________________
07 RC/LB 2wd
A/D lift pump,Tunes from Josh H, BD Manifold and custom up pipes, P&I supports, PPE tie rod sleeves

05 CC/LB
EFI ,A/D lift pump,Cognito 7"lift /P&I supports / Banks air and exaust /ARP head studs/ Mike L stage 4 trans / EPR twins.

Abby 01 RC/LB 10.28@144mph
Arias pistons/ Howards rods / S475 & PBK twin turbos from EPR/PPE 2 CP3 / SoCal stg 2 heads & cam / 100 over sticks /Socal flexplate & dampner & girdle /DPR oil pump / Lenco-bruno trans /BD intercooler / Ted at MPL / turbo blankets from Levi
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  #8  
Old 09-09-2009, 08:58 PM
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Mike L. Mike L. is offline
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I took mine off. Truck runs better. No CEL but there is a constant memory code.
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  #9  
Old 10-07-2009, 05:06 PM
bigblackbronco bigblackbronco is offline
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Default code p0540

OK, the most common thing that sets code p0540 is the air intake relay.

the thing most people don't realize is you don't have to replace this whole box
just take the top off, and what do we have


as you can see it is actually just two separate 70A SPST relays that can be had for $5 almost anywhere on the internet

I hope this helps, if you want to test the relay's there are plenty of how-to's on the internet, but I would just replace them both.
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