LMM FAQ's

[Diesel Dually]

Lets start a FAQ section here.

Post up the questions, answers TSBs and I will consolidate them all into one FAQ Post...with credit due to the original poster.

 

[BKDespain]

DPF = Diesel Particulate Filter

Regenation or Regen = Raw fuel added to exhaust to clean the DPF of soot. This heats exhaust temps to 1000*-1150*. Takes 15-30 min. of driving to complete. MPG's drop during regen and most of the time you will not be able to tell if your in regen powerwise. You will see Mpg's drop on the DIC. Edge Insight, DashHawk monitors will tell you when it is in Regeneration if you have one.

Removing DPF helps MPG and power, good sound too.

Programmers from Quadzilla, PPE, EFI Live, and HP Tuners can turn of DPF and regen commands from the ECM for when you do ditch the DPF. Eliminates CEL and Limp mode and Regen's from happening due to DPF removal.

Same 6-speed trans from 06's on up.

 

[SIKDMAX]

Subject:Information on Identifying Non-GM Calibration Usages for LMM Duramax Diesel Engine #08-06-04-006 - (01/25/2008)


Models:2007-2008 Chevrolet Express, Kodiak, Silverado
2007-2008 GMC Savana, Sierra, TopKick
with 6.6L Duramax® Diesel Engine (VIN 6 -- RPO LMM)


Attention: Dealerships should remind their customers that engine concerns due to non-GM calibrations (Power-Up Kit) will not be covered under the GM warranty.

Power-Up Kit Detection

For 2007-2008 applications, an Engine Control Module (ECM) algorithm was implemented that records the engine calibration part number and Calibration Verification Number (CVN) for the last 10 flash programming events. The ECM only records the engine calibration part number because it contains the parameters for increasing torque and fueling rates.
Customers may have re-programmed the ECM with a non-GM released calibration. Power-Up Kit calibrations change fueling and timing parameters and may contribute to the following vehicle symptoms:
• Poor Performance
• Black Smoke (This symptom is not valid for the 6.6L (LMM) diesel equipped with the diesel particulate filter (DPF). The DPF will trap black smoke unless the DPF is cracked, melted or has been removed from the exhaust system.)
• Knocking Noise
• May Cause Engine Damage
If a customer vehicle comes in to your dealership with possible symptoms from a Power-Up Kit, the dealership technician may now read the last 10 engine calibration part numbers and CVN history using a Tech 2 ®.
The dealership technician would input each ECM calibration part number into the SPS/TIS2WEB CVN database to confirm the CVN history information. Refer to Tech 2 path table in this bulletin to verify ECM calibration.
Tech 2 Powertrain Output Controls Path Table for NON-GM ECM Calibration

1. <LI type=1>Build the vehicle with the Tech 2. <LI type=1>Select F0: Engine Control Module. <LI type=1>Select F5: Module Identification Information. <LI type=1>Select F1: Programming History. <LI type=1>Turn Ignition On and Engine Off. Press ENTER Key to Continue. <LI type=1>Record the Calibration I.D. Numbers and Verification Numbers from the Tech 2 Programming History Screen.
2. From SPS/TIS2WEB, record the Calibration Part Number into the CVN Database. Get CVN.
• If the CVN does not match the CVN database, an unauthorized engine calibration part was flash programmed into the ECM.
• If the CVN matches the CVN database, we can assume a Power-Up Kit that flash programs engine calibrations was not used.

 

[SIKDMAX]

SES Light Due To DTCs P0101 And/Or P0106 - Inspect Air Filter And/Or MAP Sensor - keywords 6.6L air diesel DTC engine freeze ice icing inlet intake LBZ LLY LMM mode power reduce reduced SES tube #PIP4298A - (12/18/2007)


Models:2006-2008 Chevrolet Silverado
2006-2008 GMC Sierra
with 6.6L Diesel Engine (RPOs LBZ, LLY, or LMM)



This PI was superseded to update repair suggestions. Please discard PIP4298.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href=&quot;http://service.gm.com/servlets/BlobShtml?ShtmlFile=2046112&evc=numSrch#ss1-2046112&quot;>Condition/Concern:

You may encounter a vehicle with reduced engine power and a SES light on due to DTC P0101 and/or P0106. The P0101 may be the result of an air filter that is packed with ice or snow. The P0106 may be the result of condensation that has frozen inside of the MAP sensor. The P0106 will only occur in areas where the vehicle is at, or below, freezing for a long period of time with or without snow.
If these DTCs are experienced in warmer climates where ice and snow is not a factor, this PI does not apply.
<A href=&quot;http://service.gm.com/servlets/BlobShtml?ShtmlFile=2046112&evc=numSrch#ss2-2046112&quot;>Recommendation/Instructions:

Complete the SI diagnostics for any DTC or symptom found. If a P0106 is stored and the concern above is experienced, inspect the MAP sensor inlet. If a P0101 is stored and the concern above is experienced, inspect the air filter to determine if it is packed with ice or snow. If there is condensation, water, or an oily substance in the MAP sensor inlet, or if the air filter is packed with ice or snow, perform the suggestions below and evaluate the concern:

1. <LI type=1>Call the GM Technical Assistance Center (GM TAC) to order an updated air inlet tube that has an updated MAP sensor location. At this time, this updated air inlet tube is only available through GM TAC, not GMSPO. A TAC consultant will order a complete air inlet tube assembly for you by following the internal administrative details section of this PI. <LI type=1>Order new gaskets for the EGR valve, Intake Air Heater, and Intake Manifold Tube. There are two gaskets for the Intake Air Heater, one for the Intake Tube to Intake Manifold Tube, and two gaskets for the EGR valve to Intake Tube. <LI type=1>Refer to the &quot;Intake Manifold Tube Replacement&quot; procedure in SI and replace the air inlet tube with the updated air inlet tube received from TAC. <LI type=1>The original Map sensor will remain in it's original position. Disconnect the MAP sensor electrical connector and connect it to the new MAP sensor that is in the updated location. <LI type=1>The Intake Air Heater/Map sensor wiring harness is retained to the intake tube with a metal bracket and a bolt. Remove the bolt and re-route the wiring harness so it will reach the new MAP sensor location. Retain the wiring harness as needed. <LI type=1>Reprogram the ECM with the latest calibrations if they are not present already. <LI type=1>If the vehicle is equipped with a two-piece grill cover, install the grill cover portion only. Do not install the lower portion that covers the front bumper. If the vehicle is not equipped with a two-piece grill cover, supply the customer with the grill cover portion only. Do not install the lower portion that covers the front bumper. Notice: Some 2008 GMT900 Trucks (New Body Style) may be equipped with a combined, one-piece grill and bumper cover. Customers should follow the owner's manual for further instructions on using this cover, and they should not tow heavy loads with it installed. These vehicles should have the combined, one-piece grill and bumper cover replaced with a one piece grill cover (does not cover the bumper), which is Part # 25822811.
<LI type=1>The customer should be instructed to only install the grill cover for cold weather driving. They can use the following guidelines so they know when to use the grill cover:
• Trailer Towing: Use it up to 1.7C (35 F)
• Non-Trailer Towing: Use it up to 4.5C (40 F)
2. On 2007 Models with engine RPO LMM only: Replace the air filter with the one listed in bulletin 07-06-04-033.

For reference, here is a photo of the original air inlet tube assembly mentioned above:

 

[Arkapigdiesel]

Programmers from Quadzilla, PPE, EFI Live, and HP Tuners can turn off DPF and regen commands from the ECM for when you do ditch the DPF.

Not exactly. HP Tuners can make it so codes don't show up, but their complete DPF work around is "incomplete" (can't turn off regen in their programming).

 

[username taken]

Couldn't one "reinstall" the stock tune 10 times and defeat the history?

 

[HemisAreSlow]

nope...it would still show 10 tune changes....for all they know you ran 9 hot tunes and then put it back to stock

 

[sparky18]

anyone running an H&S DPF delete/tuner system on their LMM?

or is there a better one for these trucks?

i'm getting close to the end of my warranty and am looking to give the poor thing a break from the emission hell it has now.

of course an exhaust system is going in. :agreed:

 

[BoostN]

anyone running an H&S DPF delete/tuner system on their LMM?

or is there a better one for these trucks?

i'm getting close to the end of my warranty and am looking to give the poor thing a break from the emission hell it has now.

of course an exhaust system is going in. :agreed:

Popular tuners for the LMM are PPE Race, Edge CTS Race, Quadzilla, and EFILive.

I heard nothing but good from H&S on the Ford and Dodge side.

 

[Pepperidge]

I would probably go with the ones mentioned above for the LMM...

... but H&S BullyDog and EFI may be the only players for the LML... we'll see.