1999-2000 Cadillac Escalade Malfunction Indicator Lamp (MIL) Service Bulletin
Some customers may comment on one or more of the following conditions: • The Malfunction Indicator Lamp (MIL) is ON. • The transmission is defaulted to second gear (4L80/85-E). • The transmission is defaulted to third gear (4L60/65-E). • The instrument cluster is inoperative. Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740, P0753, P0758, P0785, P0787, P0973, P0976, P186Û, P2761, P2764 and P2769 may be set depending on the vehicle. Cause The most likely cause of this condition may be a loss of voltage to the transmission on circuit 1020. This loss of power may be caused by an open in the ignition switch. This condition may also be the resuit of an incorrect installation of an aftermarket electronic device such as a remote starter or alarm system.
Correction
With the ignition switch in the RUN position, test for battery voltage at the appropriate fuse listed below. If battery voltage is present at the fuse, inspect the ignition voltage circuit between the fuse and the transmission for possible opens. If battery voltage is not present at the fuse, replace the ignition switch using the ignition Switch Replacement procedure in the Steering Wheel and Column sub-section of the applicable Service Manual. Refer to group number 2.188 of the parts catalog for part description and usage.
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 listed above 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.
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