Problem with my 2000 pontiac grand am.
Why does my
trac off light,  service engine soon come on?
Question = When the trac off light comes on, it makes a thump when it goes through the gears.
It is in a shop right now, but the light is not coming on and they don't know what it is.

Answer:
The service engine light is or was on, then there IS a trouble code stored in the computer.
This is the key to finding out what system has a problem. There are several engine light codes
that can cause trans. Shifting problems. A common one is a code for the Intake Air Temp
sensor(IAT).

A problem with the sensor, the connector unplugged, or the wires at the sensor connector will
give a code and affect transmission shifting.
P0112 or P0113 are the codes for the IAT sensor.
Sometimes after an oil change, the sensor may have been left unplugged, as they may have
unplugged it and removed the intake air duct to gain access to the oil filter on this engine.
Trac off / Service Traction control system
---------------------------------------------------------
This light or warning indicator on the dash or message information center is usually related to the
ABS system, and sometimes to the check engine light.
When this is on the traction system is disabled. A problem in the
ABS system is usually the cause,
and would have to be scanned for codes.
Sometimes and engine problem that causes a check engine light will also cause the TRAC OFF
light to come on certain vehicles. In this case, the PCM (
Powertrain Control Module) would have to
be scanned for codes and repaired first. Then the traction control system codes can be cleared.
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2000 Pontiac Grand Am TRAC Off and Service Engine Light

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