TOPIC : 4WD

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Reflash the Ram

This bulletin applies to a range of Dodge Ram 4x4 trucks equipped with an electronic transfer case and built before Jan. 6, 2012, where the “Service 4WD” light is illuminated and the DTCM requires reprogramming.

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Isuzu Torque Converter

This bulletin applies to 1996-2009 Isuzu Ascender 4WD vehicles. Issues may involve poor acceleration, detonation ping at idle in drive or reverse, and/or possible DTC P0101, P0106 and/or P0121 set in the PCM. The vehicle will perform properly after attaining a speed of about 30-40 mph.

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Chevy 4WD

Some owners of 2004-2012 Chevy Colorado 4WD trucks may comment on a “Service 4 Wheel Drive” message displayed in the DIC (driver’s information center). Technicians may find DTC C0327 stored in current or history in the TCCM.

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Can’t Get 4WD

Owners of a 2012 Dodge Ram 3500 equipped with an electronic transfer case and built before Jan. 6, 2012, may see a “Service 4WD” light in the cabin compartment node. The technician may find that C2201 (FDCM/DTCM internal diagnostic trouble code) is set in the DTCM. When the system detects this, it shuts down the 4WD capability for the remainder of the drive cycle.

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Jittery Jeep

This bulletin applies to 2014 Jeep Grand Cherokee vehicles equipped with the Quadra-Trac II 4WD system or two Speed On Demand Transfer Case. The owner may comment about a bump felt in the driveline while turning from a stop.

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