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Old 13 Mar 2004, 02:01 pm
IRPT IRPT is offline
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Default Engine Check Light
Last night my engine check light came on about 5 minutes from my house. When I got home I checked for any codes and received the following:

P0456 & P1684

I was able to find the following info only

P0456 Evaporative Emission Control System Leak Detected (very small leak)

P16XX Computer and Auxiliary Outputs

I made sure the fuel cap was on properly, then I disconnected the negative battery cable to see if anything would reset. The P0456 code went away but the P1684 remained.

Anyone have more info on the P1684 than just Computer and Auxiliary Outputs?

Anything else I should check or do?
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Old 13 Mar 2004, 02:29 pm
Ant Ant is offline
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It simply means your battery has been disconnected in last 50 starts.
The light should go out but it will stayed stored for a while. If you run your diagnostic check it will come up because you just disconnected the battery again; normal.
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Old 13 Mar 2004, 02:33 pm
IRPT IRPT is offline
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Quote:
quote:Originally posted by Ant

It simply means your battery has been disconnected in last 50 starts.
The light should go out but it will stayed stored for a while. If you run your diagnostic check it will come up because you just disconnected the battery again; normal.
Thanks Ant. That's strange though, I have not disconnected my battery for several months. Could a low battery cause the same thing?
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Old 13 Mar 2004, 09:16 pm
MX-5 MX-5 is offline
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Ant is correct for pre-2001 cars.
The P1684 is simply a PCM readiness code.
It means that communication between the PCM and BCM is working.
Ignore it.

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Old 13 Mar 2004, 10:04 pm
IRPT IRPT is offline
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Quote:
quote:Originally posted by MX-5

Ant is correct for pre-2001 cars.
The P1684 is simply a PCM readiness code.
It means that communication between the PCM and BCM is working.
Ignore it.
Thanks MX-5!
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Old 13 Mar 2004, 10:16 pm
quicksilverdon quicksilverdon is offline
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So it was the old "loose gas cap" problem???[:I]
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Old 14 Mar 2004, 05:15 am
IRPT IRPT is offline
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Quote:
quote:Originally posted by quicksilverdon

So it was the old "loose gas cap" problem???[:I]
Not sure. I undid the gas cap and re-installed it, then I disconnected the battery negative cable for about 40 min. When battery cable was re-installed the 0456 code was gone but still had the 1684. When out and checked it a couple of hours later and received no codes.
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Old 06 Jun 2004, 04:40 pm
kcgal kcgal is offline
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I am getting error code P0601 and P1684 on my 2001 PT Cruser....does anyone know what those codes mean....or can anyone refer me to a listing of codes? My engine light is on; taking car to dealer tomorrow. Thanks, Kay
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Old 16 Jun 2004, 11:28 pm
cavynmaicl cavynmaicl is offline
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[:I] Ok, I have the engine light on, but no codes... I've run the diagnostic a few times, and gotten no codes, everything seems to be fine, but the engine light stays on... any thoughts? I'm at a loss...
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Old 26 Jun 2004, 10:42 pm
richg richg is offline
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Hi, Have a 2001 with engine light on and no codes. Transmission stays in 2nd gear. Any ideas....


Regards, Rich
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