300M engine check light

After a simple oil change by a good non Chrysler auto service garage, my
2004 300M's engine check light was on. Restarting the engine didn't
reset it.
I've had the car for 6 months, with no check light. After a bit of
pressure they agreed to read the code and got "P1681- No fuel level bus
message" . They got the code descriptions from 2008 Mitchell Repair
Info.
This was my first oil change.

With a bit more pressure they reluctantly agreed to reset the code,
telling my it had to be specifically reset, by their code reader. They
said it would probably return in about 5 minutes.
Well it hasn't returned after several starts and 3 trips of about 7km.

Any ideas why this happened much appreciated.
Also is their way the driver can reset the engine check light, without
having a code reader?

TIA.

 

That code means "No I/P Cluster CCD/J1850 Messages Received"

You can reset the CEL by disconnecting battery power. You can do that
by disconnecting the main vehicle ground at the negative jump post on
the passenger side strut tower (takes a 15 mm wrench) for 15 minutes.
Easier than getting to the battery.

Also - most auto parts store chains will loan you a code reader to read
your codes and reset them.

Some codes will also display in the odemeter by doing what is called the
key dance: Turn the key to 'Run', then to 'Off' ('Off' being the
position between 'Run' and the fully off position in which you can pull
the key out) - repeat a total of three times ending up in 'Run' - codes
will display in the odometer window.

 

Quicker still is to pull the computer-related fuses from the under-hood
fuse box. On our '02 300M there are two such fuses (10A, I think) in a
group of 4 (plus two -- IIRC -- empty sockets) at one end of the fuse
box in their own sub-compartment and leave them out for 10 to 15 minutes.

It may be that only one of the fuses needs to be pulled, but I always
pull both.

Perce

 

You are correct. But it's hard to tell someone where the particular
fuses are. They are designated as Fuse N and Fuse W - pulling either
one will reset the PCM, but I'm not sure they are even labeled by letter
in the PDC itself - have to look in the FSM.

BTW - that Fuse W does not exist prior to '02 MY of the 300M, which is
another reason I avoid the fuses when telling someone how to reset the
PCM codes.

Fuse W is in that group of 5 fuse slots at one end of the PDC - it is
the one in the center position. It's difficult to point out Fuse N
without a diagram, which I always have handy to post in web-based forums
for when this subject comes up. But only one of those needs to be
pulled to reset the PCM - so might as well be Fuse W - or remove the
power at the neg. jump post.

Oh - wait - I can give you the URL for the diagram showing fuse
locations that I keep handy:
http://images40.fotki.com/v1302/photos/4/42816/1994050/02PDC-vi.jpg

 

some codes are sent to other modules that do not respond to power
interuption esp that ip code it will be in 3 modules and stay there untill
proper clearing is done
so codes need to be removed with the use of a scantool
in the future check engine lites will not be able to be erased untill the
car sees a fix

 

THX for all your replies.
Interesting that the code description you give Bill is different than on
the code description sheet they printed from the Internet. Your desc
seems more reasonable.

I've now been on a trip of about 1,400 miles and no return of the engine
light.
I found a note in my owners manual that a steady engine light may go off
after about 5 starts. It says there is no immediate concern if the
engine lamp is steady, but if flashing shut down immediately.

Now I'm wondering why this lamp came on with a simple oil change.
Did they start the car without replacing something?

The key dance doesn't seem to work on this car. It did on my '95
Concorde so I tried it.

 

The code description I gave was copied right out of the FSM. People
often have trouble getting the key dance to work. I don't know if that
feature was removed in later production years - I don't recall that
being stated by anyone who knows for sure on the various LH car forums.
I have seen discussions in which it was discussed/argued whether the
driver's door has to be open or closed, or you have to hold your left
foot up in the air, etc. Often after it is discussed for a while, the
person who started the discussion because they couldn't get it to work
reports back that they tried again and it worked, often with no mention
if they determined that they weren't doing it right or not.

Make sure you are using the correct positions of the ignition switch
('Off' - meaning steering wheel unlock, and 'Run').