FLASH: Engine Start and Driveability At Altitude Or Brake Switch DTC P0504 - 2005-2006 Jeep Liberty

NUMBER: 18-038-05 REV. A
GROUP: Vehicle Performance
DATE: December 16, 2005

 

SUBJECT:

FLASH: Engine Start and Driveability At Altitude Or Brake Switch DTC P0504

 

OVERVIEW:

This bulletin involves selectively erasing and reprogramming the Engine Control Module (ECM) with new software.

 

MODELS:

2005 - 2006 (KJ) Liberty
** 2006 (KJ) Cherokee **

NOTE: This bulletin applies to vehicles equipped with a 2.8L engine (sales code ENR) built prior to November 21, 2005 (MDH 1121XX).

 

SYMPTOM/CONDITION:

The vehicle operator may experience one or more of the following:

  1. At an altitude of 5,000 ft. or higher, a cold engine start and/or warm engine restart that is followed by a slow to idle up condition (domestic market vehicles only).
  2. At an altitude of 5,000 ft. or higher, an Idle and/or off-idle engine shake during engine warm-up condition (domestic market vehicles only).
  3. A MIL Illumination due to DTC P0504 - Brake Switch Signal Circuits Plausibility With Redundant Contact (domestic and international market vehicles).

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