A/T - Stuck In 2nd or 3rd Gear/MIL ON/Inst. Panel Inop.

TSB SB05-05-S006

Malfunction Indicator Lamp (MIL) On, Transmission Stuck in Second or Third Gear, Instrument Cluster Inoperative (Verify and Repair Source of Voltage Loss in Transmission Solenoid Power Supply Circuit)

ISSUE DATE: NOVEMBER 19, 2005

Affected Vehicles
^ 2003-2006 Isuzu Ascender (US/UT)
^ 2006 Isuzu i-280/i-350 (TI) with 4L60-E

Service Information

Condition:

Some customers may comment on one or more of the following conditions:

^ The Malfunction Indicator Lamp (MIL) is ON.
^ The transmission is defaulted to third gear.
^ The instrument cluster is inoperative.

Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761 P2764 and P2769 may be set depending on the vehicle.

Possible Cause:

The most likely cause of this condition may be a loss of voltage to the transmission solenoid power supply circuit.

This condition may also be the result of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system.

Correction:

Verify and repair the source of voltage loss in the transmission solenoid power supply circuit.

Service Procedure

IMPORTANT:
If the vehicle is equipped with an aftermarket electronic device and the DTCs are being set when the device is being used, verify that the appropriate fuse is being supplied battery voltage during operation. If voltage is not present at this fuse, these DTCs will be set due to lack of voltage at the solenoids. This condition is most likely to occur with an incorrectly installed remote starting system. If this is the case, refer the customer to the installer of the system for corrections. ANY REPAIRS DUE TO AFTERMARKET INSTALLATION OF ACCESSORIES IS A NON-WARRANTABLE ITEM.

1. With the ignition switch in the RUN position, test for battery voltage at the circuit fuse in the transmission solenoid power supply circuit. Refer to the appropriate Service Manual for the transmission solenoid power supply circuit information.

2. If battery voltage is present at the fuse, inspect the ignition voltage circuit between the fuse and the transmission for possible opens.

3. If battery voltage is not present at the fuse, test for continuity between the fuse and the ignition switch. If NO continuity is between the fuse and the ignition switch, repair the open in that circuit.

4. If you have continuity between the fuse and the ignition switch, the most likely cause is the ignition switch. Replace the ignition switch using the appropriate Ignition Switch Replacement procedure in the Service Manual.

Warranty Claim Information





Use the labor operation table.





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