IK1201425 Service Bulletin/Repair Instructions

IK1201425 - Multiple EGR Valve/TC2 Fault Codes
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Document ID: IK1201425
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11/13/2018
Current Language: English
Last Modified: 11/15/2018
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Title : Multiple EGR Valve/TC2 Fault Codes

Applies To : 2010 and later MaxxForce DT/9/10, N9, N10
CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

11/13/2018 - Initial Article Release
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DESCRIPTION

An electrical condition that can occur within the Injection Pressure Regulator (IPR) may cause multiple EGR valve and TC2 fault

codes. This document outlines the potential fault codes that could be present, and the repair for the condition.
SYMPTOM(s)

Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):

DTC/Light
Description
SPN 1189 FMI 3
TC2WC short to PWR
SPN 1189 FMI 4
TC2WC open or short to GND
SPN 27 FMI 7
EGRP does not agree with commanded

position
SPN 27 FMI 14
EGR internal circuit failure
SPN 2791 FMI 2
EGR feedback communication fault
SPN 2791 FMI 3
EGRV supply voltage is too HIGH
SPN 2791 FMI 4
EGRV supply voltage is too LOW
SPN 2791 FMI 7
EGR Valve unable to achieve commanded

position
SPN 2791 FMI 8
EGR valve not receiving ECM PWM signal
SPN 2791 FMI 14
EGR valve Initialization Fault
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IK1201425 - Multiple EGR Valve/TC2 Fault Codes
Page 2 of 3
Customer Observations or Concerns:

• MIL

• Poor Engine Performance
SPECIAL TOOL(s) / SOFTWARE

Tool Description
Tool Number
IPR Socket
12-800-01
Comments
Instructions
SERVICE PARTS INFORMATION

Kit Description
Part Number
Quantity

Notes

Required
Injection Pressure Regulator (IPR)
Refer to Parts

Catalog
1
DIAGNOSTIC STEP(s)

Step Action

DIAGNOSTIC:

1
Follow the FCAP for the EGRV or TC2 fault code.
Decision

Yes. Make the necessary repairs and

retest for codes.

No. Continue to step 2.
Were any issues found during troubleshooting?
Step Action

DIAGNOSTIC:

2
Replace the IPR and retest for codes.
Decision

Yes. Contact Tech Services.

No. No further diagnostics needed.
Are fault codes still present?
REPAIR STEP(s)

Please refer to the engine service manual for removal and installation procedure of the IPR.

• 2010 MaxxForce DT/9/10

• N9/N10
WARRANTY INFORMATION

Warranty Claim Coding:

Group: 12000 - Engine
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IK1201425 - Multiple EGR Valve/TC2 Fault Codes
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Noun: 800 - Regulator, Injection Pressure (IPR)
Standard Repair Time(s):

Refer to the SRT Manual for Repair Times
OTHER RESOURCES

Master Service Information Site
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Copyright © 2018 Navistar, Inc.
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12/5/2018

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