Hooked up a hand handle computer and these codes came up p0685, p0688 ,p0442, p0456. Checked the fuse box under hood of vehicle & # 37 fuse (ASD) was melt down in box.
It is very possible that the relay had just shorted out and over heated.But you would want to look closely at the wires under the fuse block to make sure they did not over heat and cause the insulation to melt away.Replace # 37 with a new one and try it ,if everything else looks ok.
SOURCE: CODES,P0442,P0455,P0456,P1684
P0442, P0455 AND P0456 are all evaporative leak monitor test failures (small, medium and large leaks). These codes appear anytime the integrity of the air space above the fuel or the lines to/from the vapor canister or purge valve. If there is no damage to the canister, check the lines that run under the van from the fuel tank and canister to the purge valve (under the hood). Also, check to make sure that the hoses are not split or disconnected where they connect to the purge valve. The P1684 is abit more confusing. This is not a valid DTC for your vehicle. It's possible the scanner the shop you went to is an OTC scanner that is reporting a false code. It's also possible they wrote it down incorrectly. The closest thing that makes any sense is a P1486 which would indicate a pinched hose in the same monitor system as the other 3 codes. Best of luck!
SOURCE: can I reset a P0456 code on Chrysler Pacifica 2004
That code usually means your gas cap is not tight enough or if it is the seal on the cap is bad and not sealing tight enough. You can fix the problem by replacing the cap with a new OEM one from the Dealer. Aftermarket caps are not recommended. Sometimes once you have a new cap installed the code will go away by itself. You will need a OBD II scanner to erase the code, you can go to AutoZone and they can read and erase the code for you.
SOURCE: 2001 Chrysler Town and Country
all codes are emsions codes you can look them up on this site and they also give probably fixes http://www.obd-codes.com/p0420
SOURCE: trouble code p0685 vehicle wont
I cannot give you any specific help because you did not bother to mention YEAR, MAKE, MODEL, or ENGINE SIZE of the vehicle you are trying to get information on.
The "generic" description of Diagnostic Trouble Code (DTC) P0685 is: "ECM power control circuit malfunction."
Yup! this would DEFINATELY keep your engine from starting! It means that the ECM has no power to operate the engine management system. So, now you know the WHAT part of the equation. You must now diagnose, using the correct information for your particular vehicle, to find out the WHY.
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