What are the probable causes of codes 78, 65, and P1684?

The fault code P1684 means that power to your powertrain control module (PCM) was interrupted. The most common cause of this is because of a weak battery. When the car is stated, the voltage drops low enough that it cuts power to the PCM for just a brief moment, which will set the fault. It can also be caused by a wiring issue to the PCM, or a bad connection in the battery cable. It may or may not cause issues with drivability.

Chrysler, Dodge, and Jeep Computer Error Codes - Allpar

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A code P1684 shows that the memory has been cleared recently and is not ... P0122Throttle Position Sensor Circuit Low Voltage; P0123 Throttle Position Sensor ... 2Circuit High Voltage; P0189 Fuel Temperature Sensor 2 Circuit Intermittent ...

Running rough, lots o' codes - The Chrysler Minivan Fan Club Forums

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Jun 4, 2010 - 10 posts - ‎4 authors
Sent lots of codes: P1684, P0122, P0118, P0106, P206, P1478, P1598. Can't find anything on the last two, but looks like an electrical prob ...

Dodge Caravan 2003 P1684 P0442 P0455 P0456 - OBD-Codes.com

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Jun 10, 2012 - Your OBD-II Trouble Codes Repair Site. Menu. Home · Trouble Codes... At first it was just the battery code P1684 and the small evap code P0442. Now the other two codes are showing as well. What are the chances that this ...

10127316 WHAT DOES P0122 CODE MEAN? - Download

P0340 is cam position sensor. P1685 is for the key(has a chip in it) P1684 is battery has been disconnected. If the engine will still crank then codes P1684 & P1685 are probably old codes. So if the car will still crank, lets forget about those codes and focus on P0340 A bad cam position sensor will cause the engine to die and not allow it to start back up. Replace the cam position sensor and clear the code and the car should start up.

The P1684 code simply means that the battery has been disconnected within the last 50 starts. There will be no problems caused by this code and It will go away on its own once you start the car enough times. I know for some Chrysler vehicles, the code will go away once the problem has not occurred after 50 starts.

Hi,
I just wanted to show you what I found on the internet regarding p1684:
"P1684 engine code

The P1684 code simply means that the battery has been disconneted within the last 50 starts."

Hi the p1684 means the battery has been disconnected within the last 50 starts, the P0135 is Oxygen O2 Sensor Heater Circuit Malfunction (Bank1, Sensor1), you may have notived an increase in fuel consumption. and the P0456 code means evaporated emissions system -small leak detected the causes could be either A small leak in any of the EVAP hoses or fuel tank hoses, a small leak in the purge valve or vent valve or the EVAP Canister may be leaking
Hope this helps
Steve

P1684 Driver 5 Line 4 Battery disconnected last 50 starts. (not much info on this one)

P0300 Random/Multiple Cylinder Misfire Detected

Causes:

• Faulty spark plugs or wires
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector(s)
• Burned exhaust valve
• Faulty catalytic converter(s)
• Stuck/blocked EGR valve / passages
• Faulty camshaft position sensor
• Defective computer

P0305 Cylinder #5 Misfire Detected

Causes are the same as P0300.

If the vehicle runs fine other than the P1684 code then it is probably the result of the battery being disconnected sometime in the recent past.
Hope this helps.

302 is misfire on cylinder 2. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires .
1684 is battery disconnected, which you caused when you disconnected it--you can ignore that. You probably have an intermittent misfire. Please follow my troubleshooting steps and let me know if you have questions.

P0340
Camshaft position sensor circuit

• Most likely cause : Camshaft position sensor failed.

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P1684
means the battery was disconnected(or had been drained to a low voltage) recently.