Air Conditioning Not Cold, Malfunction Indicator Lamp On, DTC P0116 Set – 2007 Isuzu Ascender

TSB SB06-12-S005 Air Conditioning Not Cold, Malfunction Indicator Lamp On, DTC P0116 Set

Air Conditioning Not Cold, Malfunction Indicator Lamp On, DTC P0116 Set


Affected Vehicles

2007 Isuzu Ascender



Some customers may comment that the Air Conditioning (A/C) does not get cold enough. Others may comment that the Malfunction Indicator Lamp (MIL) is on. Technicians may find that Diagnostic Trouble Code (DTC) P0116 (Engine Coolant Temperature Sensor Performance) has been set in the Powertrain Control Module (PCM).


Possible Cause:

This condition may be caused by the software in the PCM that allows the P0116 to set. While the P0116 is active, the PCM will not allow the A/C compressor to engage.



Reprogram PCM.

Service Procedure

Technicians are to reprogram the PCM in vehicles built prior to the following VIN breakpoint:

Vehicle Engine VIN of First Vehicle Built

With Updated PCM

Ascender 4.2L (VIN S) 72133238


The updated PCM calibration is available on TIS Version 29.0. The new calibration is entitled “New software with diagnostic enhancements for DTC P0483”. As always, make sure your Tech 2 is updated with the latest software version. Refer to the Engine and Powertrain Control Module Programming and Setup procedures in the Service Manual for further information.


Download (PDF, 8KB)



Isuzu Motors America, Inc. is pleased to offer J2534 compliant reprogramming software available on CD for 1996 to current Isuzu vehicles. Revolutionizing the automotive industry with the J2534 standard enables independent automotive repair facilities to reprogram emission related electronic control modules on a variety of Isuzu vehicles with a single pass-thru device, starting with the 1996 model year.

Isuzu Motors America, Inc. has tested and validated the following J2534 interface devices to ensure they work safely and efficiently with our software: Drew Technologies (CarDAQ-Plus), Actia(PassThru+XS), and Blue Streak Electronics (i flash). Isuzu Motors America, Inc. recommends only using validated interface devices. Additionally, always check with the J2534 device manufacturer for the most current firmware versions before attempting any reprogramming. The following are needed to perform SAE J2534 compliant programming:

  1. SAE J2534 compliant reprogramming software available on CD from
  • Note: Reprogramming should only be performed according to Isuzu Service Bulletin specifications.
  1. A PC operating within the minimal specifications set forth below:
    • Windows 2000 or Windows XP operating system
    • One free COM Port
    • One free USB Port
    • Intel 2.4 GHz or greater
    • 256 MB RAM
    • 2 GB of hard drive space
    • 16X DVD ROM

NOTE: Failure to use a PC with the above mentioned hardware or software (or better) may cause a failure when installing or operating the J2534 Reprogramming software.

  1. SAE J2534 compliant pass-thru device
  • A third-party Pass-thru device capable of supporting J2534 API 4.04.  This device and the necessary cabling must be purchased separately.

To view Isuzu’s J2534 software, click here.


1. Which models and model years of vehicles can be reprogrammed?

Model Year Range System System Description/Name
Trooper; VehiCROSS; Rodeo; Axiom; i-270/i-290/i-350/i-370; Ascender 96-08 PCM/ECM Powertrain Control Module
i-270/i-290/i-350/i-370; Ascender 03-08 RAD Radio
i-270/i-290/i-350/i-370; Ascender 03-08 BCM/ TBCM Truck Body Control Module
i-270/i-290/i-350/i-370; Ascender 03-08 V.T.D Vehicle Theft Deterrent Learn
i-270/i-290/i-350/i-370; Ascender 03-08 GBCM Generator Battery Control Module
Ascender 03-08 LGM Lift Gate Module
Ascender 03-08 ATC Automatic Transfer Case
Ascender 03-08 DDM Drivers Door Module
Ascender 03-08 IPC Instrument Panel Cluster
Ascender 03-08 PDM Passengers Door Module
Ascender 03-08 DSM Drivers Seat Module
Ascender 03-08 FHVAC Heating Ventilation and Air Conditioning CJ2
Ascender 03-08 RAD Radio
Rodeo; Axiom; i-270/i-290/i-350/i-370; Ascender 03-08 TCM Transmission Control Module
Ascender 06-08 VSES Vehicle Stability Enhancement System
Ascender 03-06 VCIM Vehicle Communication Interface Module

1. How does a technician determine whether a reprogramming event is needed for a particular vehicle?
Data needed is available to subscribers at From the menu, select Service Information / Isuzu ESI. Enter the model and model year to review Service Bulletins, Campaign Bulletins, and Calibrations.


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