IB-12-N-001-A

SB-10054544-6156
BULLETIN NUMBER:
IB12-N-001B
Information Bulletin
ISSUE DATE:
FEBRUARY 2014
GROUP:
ELECTRICAL
No Crank/No Start, No Scan Tool Communication - Extreme Cold Weather
AFFECTED VEHICLES
2007 - 2009 Chevrolet or GMC W3500/W4500/W5500
2007 - 2015 Isuzu NPR/NPRHD/NQR/NRR
SERVICE INFORMATION
AFFECTED VEHICLES
• 2007-2015MY Isuzu N-Series Equipped with 5.2L (4HK1) Diesel Engine and Diesel Particulate Filter (DPF)
This bulletin supersedes IB12-N-001A. This bulletin is being revised to update Model Years. Please discard bulletin
IB12-N-001A.
INFORMATION
This bulletin applies to specific regions in Canada and Alaska where ambient daytime temperatures can drop below
-20 degrees C.
Some customers may experience a no crank/no start condition when ambient temperatures drop to or below -20 degrees C.
Vehicles equipped with Multi Information Display (MID) will show the error code P1464. In most cases, this condition is the
result of a stuck ECM Main Relay (X-30). This condition can be confirmed by connecting IDSS. If IDSS cannot communicate
with the vehicle, the ECM has not powered up due to the frozen X-30 Relay.
Note: If IDSS communicates normally, it is not a frozen relay. Follow normal diagnostics to correct the concern.
Isuzu is happy to announce the availability of a new relay with improved performance for this condition. Installation of the new
relay requires a small modification to the relay box cover. Follow the service procedure provided in this bulletin to properly install
this new relay.
SERVICE INFORMATION
1. Remove relay box cover.
2. Remove the original ECM Main Relay in location X-30.
3. Install the new relay at location X-30.
4. Locate the relay box cover rib as shown in figure 1.
5. Trim the relay cover rib approximately 3 mm to provide clearance for the new relay.
6. Install the relay cover and confirm it seals properly. If the cover does not close properly, trim additional material
from the cover until it seals.
PARTS INFORMATION
Parts can be ordered from American Isuzu Parts Distribution Network (AIPDN).
Part Number
8-98167-260-0
Description
Relay
Qty
1
WARRANTY INFORMATION
For vehicle repaired under warranty, use the labor operation code provided below.
Operation
Code
N2821
N2827
Description
Labor Time
Relay – Fuel System –
Replace
See
Published
Labor Time
See
Published
Labor Time
Powertrain System –
Replace

IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
SB-10054544-8673
BULLETIN NUMBER:
IB12-N-001C
ISSUE DATE:
AUGUST 2014
GROUP:
ELECTRICAL
NO CRANK/NO START, NO SCAN TOOL COMMUNICATION – EXTREME
COLD WEATHER
AFFECTED VEHICLES

2007-2015MY Isuzu N-Series
Equipped with 5.2L (4HK1) Diesel Engine and Diesel Particulate Filter (DPF)
This bulletin supersedes IB12-N-001B. This bulletin is being revised to update ambient
temperature information. Please discard bulletin IB12-N-001B.
INFORMATION
This bulletin applies to specific regions where ambient temperatures can fall below -20°C/-4°F.
Some customers may experience a no crank/no start condition when ambient temperatures fall
to or below -20°C/-4°F. Vehicles equipped with a Multi Information Display (MID) will show the
error code P1464. In most cases, this condition is the result of a stuck ECM Main Relay (X-30).
This condition can be confirmed by connecting IDSS. If IDSS cannot communicate with the
vehicle, the ECM has not powered up due to the frozen X-30 Relay.
NOTE: If IDSS communicates normally, it is not a frozen relay. Follow normal diagnostics to
correct the concern.
Isuzu is happy to announce the availability of a new relay with improved performance for this
condition. Installation of the new relay requires a small modification to the relay box cover.
Follow the service procedure provided in this bulletin to properly install this new relay.
SERVICE INFORMATION
1.
2.
3.
4.
Remove relay box cover.
Remove the original ECM Main Relay in location X-30.
Install the new relay at location X-30.
Locate the relay box cover rib as shown in Figure 1.
Figure 1 – Locate X-30 relay and relay cover rib
Figure 2 – Cut at dashed line
5. Trim the relay cover rib approximately 3mm to provide clearance for the new relay.
6. Install the relay cover and confirm it seals properly. If the cover does not close properly,
trim additional material from the cover until it seals.
PARTS INFORMATION
Parts can be ordered from American Isuzu Parts Distribution Network (AIPDN).
Part Number
8-98167-260-0
Description
Relay
Qty
1
WARRANTY INFORMATION
For vehicle repaired under warranty, use the labor operation code provided below.
Operation Code
Description
N2821
Relay – Fuel System – Replace
N2827
Powertrain System – Replace
Labor Time
See Published
Labor Time
See Published
Labor Time

SB-10054544-9604
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
BULLETIN NUMBER:
IB12-N-001A
ISSUE DATE:
DECEMBER 2013
GROUP:
ELECTRICAL
No Crank/No Start, No Scan Tool Communication – Extreme Cold Weather
AFFECTED VEHICLES

2007-2014MY Isuzu N-Series
Equipped with 5.2L (4HK1) Diesel Engine and Diesel Particulate Filter (DPF)
This bulletin supersedes IB12-N-001. This bulletin is being revised to update model
years. Please discard bulletin IB12-N-001.
INFORMATION
This bulletin applies to specific regions in Canada and Alaska where ambient daytime
temperatures can drop below -20 degrees C.
Some customers may experience a no crank/no start condition when ambient temperatures
drop to or below -20 degrees C. Vehicles equipped with Multi Information Display (MID) will
show the error code P1464. In most cases, this condition is the result of a stuck ECM Main
Relay (X-30). This condition can be confirmed by connecting IDSS. If IDSS cannot
communicate with the vehicle, the ECM has not powered up due to the frozen X-30 Relay.
Note: If IDSS communicates normally, it is not a frozen relay. Follow normal diagnostics to
correct the concern.
Isuzu is happy to announce the availability of a new relay with improved performance for this
condition. Installation of the new relay requires a small modification to the relay box cover.
Follow the service procedure provided in this bulletin to properly install this new relay.
SERVICE INFORMATION
1.
2.
3.
4.
Remove relay box cover.
Remove the original ECM Main Relay in location X-30.
Install the new relay at location X-30.
Locate the relay box cover rib as shown in figure 1.
Figure 1
Figure 2
Locate X-30 relay and relay cover rib
Cut at dashed line
5. Trim the relay cover rib approximately 3 mm to provide clearance for the new relay.
6. Install the relay cover and confirm it seals properly. If the cover does not close properly,
trim additional material from the cover until it seals.
PARTS INFORMATION
Parts can be ordered from American Isuzu Parts Distribution Network (AIPDN).
Part Number
8-98167-260-0
Description
Relay
Qty
1
WARRANTY INFORMATION
For vehicle repaired under warranty, use the labor operation code provided below.
Operation Code
N2821
Description
Relay – Fuel System – Replace
N2827
Powertrain System – Replace
Labor Time
See Published
Labor Time
See Published
Labor Time