PIC3557

Bulletin No.: PIC3557
Date: Nov-2012
Subject:
DTC U1000
Models:
2003-2005 Chevrolet Malibu (Classic)
2003-2005 Pontiac Grand-Am
2003-2005 Oldsmobile Alero
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
The diagnostics for a class 2 communications DTC U1000 may not lead a technician to a final repair.
Recommendation/Instructions
The vehicles in question were built without the oil level monitoring hardware. The software is supported by the PCM and the PCM is looking for a signal input
from the oil level sensor over class 2 communications. The technicians are to disregard the DTC U1000 that may be set current or in history.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the
remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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