My 2006 dodge caravan is throwing the code po404, what does this mean and how can i fix it?

P0700 Transmission Control System Malfunction
P1776 Ignition Retard Request Duration Fault

P0138 - Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. The only way to set this code is to have a break in the sensor's ground wire or the signal voltage wire is shorted to the 12 volt heater wire for that sensor. Start by looking for a corroded terminal in the sensor's connector or a terminal that got stretched or pushed out of the plug body. Next, check the wiring harness for signs of melted wires, especially where they travel near hot exhaust parts.

If you haven't found the cause by this time, use a scanner to view live data and look at the sensor's voltage compared to the passenger side sensor. If it's normal, you have an intermittent problem that isn't currently acting up. Try flexing on the wire harness to see if the voltage changes. If the voltage IS high, unplug connectors going to that sensor and wiggle harnesses until the voltage changes. That will help you narrow down the location of the problem.

Hi , could you supply the correct engine code and vin number ?
For the engine code (EKG) the firing order is 1-6-5-4-3-2
For the engine code (EGH) the firing order is 1-2-3-4-5-6

Code 1684 means the computer has lost power since the last check, usually from disconnecting the battery.
Code 344 means the cam sensor on bank one is not always sending a signal to the computer. It could be a wiring problem or something with the actual camshaft.

U0155 LOST COMMUNICATION WITH CLUSTER/CCN

There is a communication problem between the cluster & the PCM. It may be as simple as a bad connection at the connectors behind the cluster or maybe as bad as a bad PCM. Start with simple things first. Does the CEL light when you turn the key on? After you clear the codes (if any) does the display say "DONE"? Test the CEL by leaving the gas cap loose or off & starting the engine & see if it throws a code.

That would be a good start. Use some WD-40 to displace moisture and help resist corrosion.

both codes po406 and po404 refer to a fault in the EGR system
Po404 > Exhaust Gas Recirculation Circuit Range/Performance not within proper range.
Po406> Exhaust Gas Recirculation Sensor A Circuit High (meaning the circuit is open or disconnected)
Without actualy checking the voltages (wiring)
Replace the EGR valve
clear codes
test drive

Hello! Well - both of these codes are in reference to shift pack issues. P0700 is related to torque management, designed to reduce the RPM's at highway speed and lock up the torque converter. If it's throwing this code, there is a strong likelihood that the clutch packs are damaged. P0740 is directly related and will most likely result in the need for the clutch packs being replaced. I wish I had better news to report. :(

Hope this helps and good luck!

-KC GTO Dad

That is an EGR code, replace the EGR valve and it should run fine again.

On the gas cap itself theres a rubber o-ring.If thats quashed in any way you'll need to replace it.Sometimes takink the o-ring off and putting it back on fixes the problem.Its a very common problem ans is not that expensive to fix..The reason the code keeps coming back is because its a pressurize system and if theres a leak in the system it will throw the light in the dash..

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