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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 03-07-2016, 08:38 PM   #1 (permalink)
Tapinthat
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2005 LLY injector controle module problems

I was driving My 2005 LLY down the road and it just shut off all of a sudden! I hauled it to the shop put it on the computer and it said the injector control module was bad! I replaced it drove it for 5 or 6 days then bam it went all of a sudden! Has anyone ever had this problem?

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Old 03-08-2016, 07:37 AM   #2 (permalink)
Ramblinrodney
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First welcome to DP
Do you have any codes? Must not been fixed at a GM Dealer?
GM Part No.: 97303751 New OEM FICM about $1250 And used From $143 and everything inbetween.
They should have some kind of guarintee. Is it new or used? They can be repaired.

It is very rare for a FICM to go bad on a LLY engine-- shorted wires on the FICM bracket-very common.
https://www.dieselplace.com/forum/76-...g-harness.html

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.

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Last edited by Ramblinrodney; 03-08-2016 at 08:00 AM.
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Old 03-08-2016, 08:58 AM   #3 (permalink)
Tapinthat
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The control module is brand new! So the wiring harness has to be grounding out or something!
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Old 03-08-2016, 12:18 PM   #4 (permalink)
Ramblinrodney
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Quote:
Originally Posted by Tapinthat View Post
The control module is brand new! So the wiring harness has to be grounding out or something!
What are your codes? Who did the repairs? Did they follow GM's diagnostics for checking bad FICM. If not your original one is good so get your money back.
Did you read post #3?
Is your repair place capable to handle this job?
https://www.dieselplace.com/forum/76-...g-harness.html
I'll put it up in case you don't know how to click on links. And as you can see codes are important.

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


Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N6606
Wiring and/or Connector-Fuel System - Repair or Replace
Use Published Labor Operation Time
I'll let some one else have a turn on this.
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Last edited by Ramblinrodney; 03-08-2016 at 12:35 PM.
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Old 03-08-2016, 12:40 PM   #5 (permalink)
Tapinthat
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I've got it running now! I had a edge juice with attitude and somewhere in it one of the connections had a short I took it off been running good for 2 hrs
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Old 03-08-2016, 01:25 PM   #6 (permalink)
Ramblinrodney
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Quote:
Originally Posted by Tapinthat View Post
I've got it running now! I had a edge juice with attitude and somewhere in it one of the connections had a short I took it off been running good for 2 hrs
That's why it's important for a signature. If I knew you had that Edge on your truck that's the first thing that I would of mentioned. Take your Edge Off.
If you plan on sticking around fill it out. And thanks for the update most new people don't do that.
Note to self, no signature don't respond. I put up a lot of info that you didn't need and was of no use.
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Last edited by Ramblinrodney; 03-08-2016 at 01:44 PM.
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