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Old 03-04-2008, 01:17 PM   #3 (permalink)
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#04-06-04-007G: Service Engine Soon (SES) Light On, DTCs P0087, P0093, P1093, Low Power, No Start, Hard Start, Fuel in Crankcase (Replace All Injectors - New Strategy for High Fuel Return Rates) - (Oct 16, 2006)
Subject:Service Engine Soon (SES) Light On, DTCs P0087, P0093, P1093, Low Power, No Start, Hard Start, Fuel in Crankcase (Replace All Injectors -- New Strategy for High Fuel Return Rates)
Models:2001-2004 Chevrolet Silverado

2003-2004 Chevrolet Kodiak C4500/C5500 Series

2001-2004 GMC Sierra

2003-2004 GMC Topkick C4500/C5500 Series

with 6.6L Duramax™ Diesel Engine (VIN 1 -- RPO LB7)

This bulletin is being revised to include additional service information and revised warranty information. Please discard Corporate Bulletin Number 04-06-04-007F (Section 06 -- Engine/Propulsion System).

Some customers may comment on the Service Engine Soon light becoming illuminated. Upon investigation, the technician will find DTCs P0087, P0093 or P1093. Additional customer comments may include a lack of power, a fuel smell on the oil indicator (dipstick), fuel in the engine oil, fuel coming out of the crankcase breather, the engine cranks but does not run, or a hard start condition. This condition will not cause an engine misfire. Do not apply this bulletin to any diagnostic other than what is identified in the chart below.

The fuel injectors have internal conditions that may cause them to return an excessive quantity of fuel to the tank, as well as leak fuel into the crankcase. Due to the return flow and/or leakage, the fuel injection pump may not be able to build up adequate fuel rail pressure.

Important: Before the technician begins diagnostics and repair, be sure to follow the guidelines in Corporate Service Bulletin Number 03-06-04-036 A to avoid fuel system contamination.
Important: If the technician commands the fuel rail pressure with Tech 2® to 160 MPa at idle and it reaches at least 158 Mpa , then this bulletin does not apply. The technician should then follow normal SI diagnostics. If the rail pressure does not reach 158 MPa, snapshot the data, then follow the diagnostics in this bulletin.
Follow current diagnostics for the condition the vehicle is experiencing, then reference the table below. If the diagnostics lead to Fuel System Diagnosis - High Pressure Side, follow the diagnostic until the Fuel Injector Return Flow is measured at each cylinder bank return connection (bank to bank).
Start with this SI Diagnostic in the Diagnostic Information and Procedures sub-section of the Engine Controls Section
Delayed Start
Hard Start
Lack of Power
Lack of Power, Sluggishness or Sponginess
Engine Cranks but Does Not Run
Engine Cranks but Does Not Run
Fuel in Oil or Fuel leak out of breather
Fuel In Engine Oil in Engine Mechanical
DTC P0087
DTC P0087
DTC P0093
DTC P0093
DTC P1093
DTC P1093
Important: If the SES light is illuminated, follow diagnostics for the DTC as indicated with the Tech 2®.
Important: When installing the new fuel injectors, lubricate the inside of the fuel injector sleeve with clean engine oil prior to installing the injector. Do not lubricate the injector or O-ring seal prior to installation.
Injector sleeves only need to be replaced if there is damage to the tapered sealing surface where it seals against the cylinder head. If an injector sleeve becomes loose or dislodged when replacing injectors, inspect the cylinder head to sleeve mounting surfaces. If there are no witness marks from a combustion leak or coolant leak, reseal the sleeve using SI procedures for Fuel Injector Nozzle Tube Sleeve Replacement.
If fuel return flow on either the right or left cylinder bank is above the initial fuel injector bank return flow value, then replace all eight (8) fuel injectors using theFuel Injector Replacement procedure in the Engine Controls section of SI.
Record all diagnostic data as outlined on a copy of the attached diagnostic worksheet. The diagnostic worksheet, snap shot of any DTCs, snap shot of the preliminary (actual) fuel rail pressure vs desired as commanded by the Tech 2® and a copy of the repair order with technician comments is to be returned with the removed injectors.
After replacing the injectors, perform the following steps:
  1. Install all disconnected and removed components. Refer to the applicable procedures in SI.
  2. Start and idle the engine. You may have to prime the fuel system before the engine will start.
  3. Connect a scan tool.
  4. Command the fuel pressure control to 160 MPa with a scan tool.
    • If the fuel pressure is more than 145 MPa, the system is OK.
    • If the fuel pressure is unable to increase to more than 145 MPa, Refer to System Diagnosis -- High Side Pressure in SI.
    • Be sure to record fuel pressure readings on the diagnostic worksheet.
Parts Information

Part Number
Injector Kit, Dir Fuel (Includes Injector, Gasket, Seal)
Gasket - Valve Rocker Arm Cover
(Reusable Gasket)
As Req'd
Gasket - Fuel Injection Fuel Return Pipe and Injector
Gasket - Fuel Injection Fuel Return Pipe
12378521 (U.S.)
88901148 (Canada)
Seal - Water outlet
Sleeve, Injector
As Req'd
Seal, O-ring - Injector Sleeve
As Req'd
*P/N 97729095 is only available in a merchandising pack quantity of 4. Current order restriction limits availability to 8 per VIN.
If a fuel filter is required, it is the customers responsibility to replace the filter at their own expense.
Warranty Information

Important: This labor operation listed below is covered by emissions and is not subject to the $100.00 deductible. Dealers will need to use the following information when submitting claims on vehicles still covered under that warranty:
2001-2003 Model Year vehicles may be covered by Special Policy Number 04039 A . Please refer to Special Policy Number 04039 A before submitting any warranty claims.
For vehicles repaired under warranty, use:
Labor Operation
Labor Time
Sierra, Silverado
Injector, Fuel - Diagnose & Replace (2004 Models)
8.0 hrs*
Kodiak, TopKick
Injector, Fuel - Diagnose & Replace (2004 Models)
9.7 hrs*
See Special Policy Number04039 A for published times (2001-2003 Silverado, Sierra Models)
(2003 Kodiak, TopKick Models)
*Note: The labor time represents a reduction over the previously published time due to unnecessary steps in the repair procedure being eliminated, such as removing the radiator shroud and accessory drive belt. Also, the original add time to replace all injectors was overstated, Finally, the number of diagnostic steps have been adjusted because individual injectors are not being diagnosed. The labor time guide will be revised in the near future.
Important: All replaced injectors must be returned to the WPC. IMPORTANT: WAIT TO RECEIVE THE WPC PART RETURN REQUEST PRIOR TO RETURNING THE INJECTORS. Please follow Corporate Bulletin Number 99-00-89-019C that applies to the WPC return procedures. All eight (8) injectors of a single engine must arrive at the WPC boxed or bagged together. A copy of the part request, repair order with technician comments, snap shot of the preliminary (actual) fuel rail pressure vs desired as commanded by the Tech 2® and the completed diagnostic worksheet should be included with the injectors. The tags found in the replacement injector box must be completed and attached to each injector. The WPC will be verifying sets of injectors for high flow rates.
Diagnostic Worksheet for Diesel Fuel Injector Replacement Data

VIN Number:

Page: 1
Customer Concern
Comments __________________________________________________ ________________ __________________________________________________ _________________________
Technician Observations (confirm customer concern, different condition, DTCs)
Confirmed Customer Concern: YES / NO
DTC: P0087 P0093 P1093 None Other: ________________________
Important: Include snap shot with returned injectors.
Unusual Conditions Observed: ______________________________
Key On Engine Off Actual Fuel Rail Pressure:
Fuel Supply vacuum at idle:
inches / mm
Fuel Supply vacuum at highway speed:

inches / mm
Set Parking Brake and perform the next test in Neutral (Manual Transmission) or Drive (Automatic Transmission), if engine does not run, skip the fuel pressure test.
Important: Include snap shot with returned injectors.
Commanded Fuel Press. @ idle with Tech 2
25 Mpa
40 Mpa
50 Mpa
60 Mpa
70 Mpa
80 Mpa
90 Mpa
100 Mpa
150 Mpa
160 Mpa
Actual Fuel Press. @ idle with Tech 2

Engine Cranks but Does Not Run specific values:
Ignition 1 voltage parameter on T2
Engine speed while cranking on T2
Prime Pressure (step 9)
Lowest pressure in 2 minutes (step 10)
Actual Fuel Rail Pressure Cranking (Step 13)

Cylinder Compression Values
(Step 11)
(Step 12)
Vapors (Y/N)
Fuel System Diagnosis-High Pressure Side Observed Values: Concern of P0087, P1093, Hard Start, Lack of Power, Engine Cranks but Does Not Run
Fuel API Rating ________
Step 23.
Initial Injector Bank Return Flows:
Fuel Temperature ________ Deg. C or F
Left (Driver) Bank:
Command Fuel Pressure to 160 Mpa with scan tool
Right (Passenger) Bank
Commanded FRP=160

Actual FRP= __________Mpa
After fuel Injector Replacement
Commanded FRP=160
Actual FRP= __________Mpa
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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