P420 code I have a 2002 dodge grand carvan sport and the heat is not working, last week my Check engine light came on so I had the code read at advance auto parts and the said I have a p420 code. Today the heat stoped working what can be causing this, I know I have an eguest leak and I am only looking to get another 6 mths out of the van. Does anyone have a solution to this problem..

P0700 is generic transmission code, transmission malfunction.. Have it read with a scanner to find the exact code. p0562 is battery voltage is low. Check positive and negative cables for corrosion and good connection. Also check the engine and body grounds. Make sure you have a engine to body strap/ground. They break. This could be the reason you're getting the p0700 code.

Any codes come up? I've got a few ideas but i need some more information.

You will loose all data, if you clear any
OBD MIL Lamps

Gas Cap light doesn't always mean that was the problem

Normally, white smoke is coolant burning.
Can you see any coolant leaks in the engine compartment ?

Hello there, I have a 91 dodge grand caravan and by the looks of it, you used the key on, key off, key on, key off, key on method to get those codes. If so, 12 is one code(number of key ons since last fault)(direct battery input to controller disconnected within last 50 too 100 ignition key ons), And for code 55, its just the completion of faultcode display on the check engine light. So basically, there is nothing to worry about. * *NOTE*-All information came right out of Haynes repair manual for 84-95 Dodge Carvans

If I am correct that is a aluminium core and plastic tank radiator, if the tanks have not cracked you might get it repaired with new seals

Regarding the Check Engine Light: Do you have a Digital Odometer? If So with the Engine Light ON = you have a Code. Insert the Key in the Ignition. Turn the Key three (3) times from OFF to ON (not Start) which is the position just before Start. On the third (3rd) time leave the Key in the ON (not Start) position. Look at the digital odometer space. Write down and Codes that are present. For Example "P 0430". The last code will be "donE" = it is done giving you codes. Respond a Comment back to this Post and let me know what Code(s) are showing. I am assuming you have a 4-speed transmission?
There are 2-speed Sensors on the front of the transmission. Input and Output Speed Sensors.
They are level with each other, right above the top line of the Solenoid (wiring harness goes into this box-like assembly) The one that is closest to the Solenoid is the Input Sensor. The one (at the same level) towards the left side of the van is the Output sensor. The Output Sensor is most likely malfunctioning. Unplug this and ceck the electrical connnection. Remoe and corrosion or oxidation (white stuff) from both sides of the metal connections. Replug in and check operations. Because of it's location, these Sensors are prone to corrosion and oxidation. If that does not work: Unplug again and remove the Output Sensor. I believe a 1-in wrench or 1-inch Deep Socket will work, after you unplug the sensor. Before replacing the sensors - you may clean the metal particles off the interior tips of the Sensors and reinstall and check operations. IF this does not fix the problem: Unplug, Remove and Replace this Output Sensor.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

The light could be coming on for a totally unrelated reason like an oxygen sensor. Most major part stores now scan codes for free (or they will let you use their scanner in on site). Scan the code and post it here for additional help.

More than likely the clock spring (spiral connection) will need to be replaced, but you need to have it scanned for codes to verify. It can be several other things as well but most of the time it's the clock spring. Don't put it off too long, when the light is on the airbag system is dissabled.

Yah code 1684, it just tells you that battery/computer has been disconnected within last 50 starts. If it doesn't drive you nuts, give it some time, you'll be suprised how quick 50 starts will go by & light should go out