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Discussion Starter #1 (Edited by Moderator)
2004, GMC 3500, lly motor -
Problem - 2004 lly motor, turn key on, glow plug light goes out, dash is lit, gas gauge shows empty with low fuel light lit. Tank is full. Turn key to start and it will fire, run, then die 5 seconds later. Try to restart and will not normally start, just turn the motor over. If you turn key off, wait 15 secs, turn key to start and it will fire, run, then die 5 seconds later.


Codes set -
P0201 - P0208 injector circuit for all cylinders
P2149 - Fuel Injector Group B supply voltage Circuit/open
P2146 - Fuel Injector Group A Supply Voltage Circuit/Open
P1293


Troubleshooting what I have found so far:
Actual Fuel Rail Pressure 45-50mpa while cranking
Desired it 45mpa
After 30 secs rail pressure has fallen to 5mpa - which I've read is normal
FRP Regulator Command while cranking goes to 45%
FRP Regulator Relay is ON
Crank Signal Present - YES while cranking
Cam Signal Present - YES while cranking
Engine oil pressure Sensor 0-2.5 Volts while cranking
Injector Command changes on all injectors while cranking.


Attempt to clear codes with Launch Scanner and Torque App, occassionally shows unable to communicate with ECM to clear codes.


Anything else to check using the Launch Scanner or Torque app. The launch Scanner is on loan for a few days/ hours. Is there anything else to check to narrow down to which device before my loan on device expires?


I have put the radiator hose under the wire bundle by the alternator years ago. I also had to do the icepick fix to the Number 7 injector, still need to replace that plug.
Replaced the fuel filter.
Rebuilt the filter head with new Orings. Since I'm getting fuel to the rail and building good pressure, pretty confident not losing prime and have fuel going to injectors.
Replaced the Air Filter since i looked inside to make sure it wasn't clogged up or mouse house.
Any recommendations?
Thinking its the FICM, but haven't seen a test. Still need to check the wiring going out of the FICM and over on the driver side wheel well and under the fuse box.
Appreciate any help.
 

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pollolittleg,


Same exact symptoms for me about three years ago. Crank, fire and die. Crank fire and die.


Local diesel shop discovered a mouse nest under the main fuse panel in the engine bay where all of the truck's wiring harnesses meet. Fourteen wires had been chewed through.
 

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Discussion Starter #3
Thanks for the quick reply. I saw that thread, so gonna check that out. Also saw a thread where the ficm had gone bad.
 

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It is rare that a FICM is bad on a LLY engine, but wires can cause problems--

At the passenger side of the alternator-- the FICM wire harness is tied down to the bracket with a zip tie. The sharp corner of the FICM bracket cuts into the wire loom and the wires. Cut the zip tie and inspect the wires inside the plastic loom. Repair the wires as necessary-- Best to isolate the harness with a short piece of heater hose. Common problem with LLY engines.

Document ID# 1876986
2004 GMC Truck GMC K Sierra - 4WD

Subject: LLY Intermittent SES/MIL Lamp Illuminated, Reduced Engine Power, Fuel Injector Driver Circuit DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, Cylinder Bank Shut Down DTCs P2146 or P2149 #06-06-04-026A - (12/08/2006)

Models: 2004-2005 Chevrolet Kodiak C4500/C5500 Series, Silverado Models

2004-2005 GMC Sierra Models, TopKick C4500/C5500 Series

with 6.6L Duramax™ Diesel Engine (VIN 2 -- RPO LLY)

This bulletin is being revised to update the Kent Moore tool number used on inspecting the injector connections. Please discard Corporate Bulletin Number 06-06-04-026 (Section 06 -- Engine/Propulsion System).

Condition
Some customers may comment that the Service Engine Soon lamp is illuminated and/or intermittent along with a significant reduction in engine power (limp home mode). Upon investigation, the technician may find one or multiple injector driver circuit diagnostic trouble codes (DTCs) P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208 and bank shut down DTCs P2146 or P2149.

Correction
Important: If the published diagnostics lead to an injector connector on cylinders 2 and 7, the 2 and 7 cylinder injector connectors must be repaired and supported as per bulletin 05-06-04-047B.

If the published diagnostics lead to an injector connector on cylinders 1, 3, 4, 5, 6 or 8, replace the affected injector connector pigtail harness with P/N 88988963 using the following repair procedure.

Complete normal SI diagnosis for the trouble codes set.
Injector circuit or injector coil tests may be normal until the engine reaches operating temperature. Recheck circuit/injector resistance readings with a warm engine.
Important: Dealer technicians are to repair wire chafes at the Fuel Injection Control Module (FICM) as needed. Follow the correct SI wiring repair procedures. Insulate the harness from the aluminum retaining bracket with suitable material (electrical conduit or heater hose) so the harness will not chafe again.

Important: When diagnostics are being completed for Injector Driver Fault codes, the dealer technician may notice the Fuel Injection Control Module (FICM) connector is wet or has a wet residue on it. The FICM connectors do have a type of dielectric grease that may be mistaken for diesel fuel. The FICM should not be replaced if this type of wet residue is found. Clean and dry the connectors as needed. No extra dielectric grease needs to be added to the FICM connectors.

Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. This is an aluminum bracket very close to the FICM connectors. If any part of the taped portion of the harness is touching the FICM wiring harness retaining bracket, then you must look for chaffing on the wiring harness. It must be disconnected from the FICM and bent back towards the engine. Look for any chafes into the tape. If necessary peel the tape from the area and look for any chafes into the wires. Some of these chafes are very small, possibly the size of a pen tip, but could still cause injector circuit concerns.
If diagnosis is inconclusive, inspect the injector connections on all related cylinders. Pin drags and terminal tension can be checked with Kent Moore tool number J 35616-35.
Clear the trouble codes and then wiggle test the related injector connectors to see if the trouble codes can be induced. If the vehicle had only injector circuit codes for P0202 or P0207 (with bank shutdown P2146 or P2149), and the wiggle test induces a P0202 or P0207 to reset, use bulletin number 05-06-04-047B to repair the injector connectors and install the injector harness support kit.
If the trouble codes or customer concern is induced during the wiggle test on any other cylinders (other then P0202/P0207), replace the affected injector connector pigtail with P/N 88988963. This replacement pigtail can be used to repair any cylinder except number 2 and number 7. The 2 and 7 cylinder connectors must be repaired and supported as per bulletin 05-06-04-047B.
Parts Information
Part Number
Description

88988963
Pigtail Harness, Fuel Injector Connector
 

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Discussion Starter #5
Thanks again, that's a lot of info to look into. Any idea of any other information to use the scanner for?
I gotta push the truck into shop so its a little warmer and check all that.
 

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Any idea of any other information to use the scanner for?
Do you have any power adder plugged in?

You provided codes, there’s not a whole lot you can check without it not running with your scanner.

No Start or Hard Start

Excessive fuel restriction, check or change fuel filter
Use vacuum gauge, check the suction, you should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. If you have too much suction, after changing the fuel filter, the restriction could also be the sock in the tank. Too little vacuum (less than 2 inches Hg) means that it could be sucking air.
Check for air in fuel system, install clears lines before and after the filter housing to check for air in the lines.
Confirm actual versus desired rail pressure, even under crank no start conditions
If the above check good, then it comes down the following.
a. fuel injectors (see injectors for more diagnostic information)
b. high pressure injection pump – CP3
c. Fuel pressure regulator, check to make sure it is not stuck.
d. fuel pressure relief valve (high pressure limit valve), check to make sure it is not leaking into the return system when rail pressure is 160 MPa.
Before condemning the high pressure pump you need to make sure there are no high pressure fuel leaks. Use the EN-47589 (same block-off caps as #9011 SPX Miller tools) cap set to cap off the injector rail to isolate the injectors from the injector return system.
It takes approximately 2500 PSI rail pressure to start.

P1293
Modules:ECM
Description:Injector Circuit Low to High Current Transition Time Bank 1

https://www.dieselplace.com/forum/6...on-2004-5-2005-lly/517001-p1293-2005-lly.html

Google (duramax LLY how to test FICM) lots of YouTube videos and info.
 

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Discussion Starter #7
Got it finally pushed into the shop on concrete, now it appears I have diesel leaking out from somewhere under the bed. Hopefully, it will appear and be the fix.
 

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Discussion Starter #8
No power adders, bone stock except for the Bilstein shocks and new stock size tires and optima batteries. Even the radio is still stock even though the cd's are stuck in it and don't play.
 

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Discussion Starter #9
upon further inspection last night, clear oily liquid is puddling under the driver side, back left side of motor, but the only wet item, appears to be a brake line. Oh boy, something else to work with.
 

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I just had to have my FICM rebuilt, fixed my problem. Does it sound like an old tractor when it fires up.
 

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Discussion Starter #11
Big Duramax, where did you have the FICM rebuilt. According to the diag guy, that's what he said was wrong. So, sounds like you had a good experience, I like to use good experiences.
 

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I used EBay, eBay item number:223449337379
 

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Discussion Starter #13
Thanks, will do.


The FICM is bad according to a diagnostic guy, so gonna send it off to get it repaired. He says the FICM has 12v going in and only 2v or 8-9 volts to the injectors. So, here's to hoping.
 

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Discussion Starter #14
It was the FICM, sent to ebay place for repair. $13 to ship it. $155 to repair and ship back. $200 for a guy to verify what i thought it was.
Truck up and running, now has a coolant leak, so on to the next problem.
 
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