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Is the SECURITY light lit on the insturment cluster ? Does the engine spin with key in start position ?
Vehicle Theft Deterrent (VTD) System Check
Attempt to start the vehicle.
NO - The engine cranks and starts.
Refer to Engine Cranks but Does Not Run in Engine Controls.
Note the security indicator while attempting to start the vehicle.
The indicator light is ON and OFF after approximately 5 seconds.
• SECURITY Indicator Always On or Flashing, Engine Does Not Crank
• SECURITY Indicator Always On or Flashing, Engine Starts
* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.
A flashing engine light is an indication of a cylinder misfire. This will give you the symptoms listed. You need to retrieve the codes to determine which cylinder/s are the problems and repair from there. Usually a spark plug/ignition wire/ coil that cause misfires
check engine lights report on engine and transmission faults
if it is only in the rain I suspect that the wires and connections to the box or in the engine compartment are being affected by water getting into the couplings in the harness.
If your O2 sensors are malfunctioning, the main symptom would be that the Check Engine light will come on. On some vehicles, an O2 sensor circuit shorted to ground can cause a no-start problem.
If the "Check Engine" or "Service Engine Soon" light is on and there is a code for the O2 sensors, I would like to also advise you that many O2 sensor codes are not caused by the O2 sensors themselves. In many cases, the O2 sensors are only REPORTING the problem. for example, a code P0171 "Oxygen Sensor Lean" code is rarely ever caused by the O2 sensor. It is usually caused by a vacuum leak or a failed Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or a bad fuel injector. In these cases, repairing the real reason that the engine is running lean will fix the O2 Sensor code without replacing the O2 sensor.
a flashing check engine light means catalyst damaging misfire which is just about the worst thing for your engine. i suggest not driving it til its fixed. misfires will cause it to shake. check for spark first.
P0601 - Internal Control Module Memory Check Sum Error
Basically that means that there is an interal fault in the Powertrain Control Module (PCM). There have been many reported PCM failures on Chrysler/Dodge products although it is possible for this to happen on any vehicle. In Dodge/Chrysler products, a P0601 trouble code means that a serial communication failed inside the computer at least 6 times.
Symptoms: Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light. Typically the engine runs fine, gauges work, etc.
Causes: A code P0601 in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code.
Possible Solutions: With a P0601 OBD-II trouble code, the most common fix is to replace and reprogram the PCM. In a few cases the dealer may be able to reflash the PCM and get it working. But more than likely the PCM will need to be replaced and reprogrammed (we recommend you take it to a dealership for this). The good news is it *may* be covered under your emmissions warranty. So even if you're out of bumper-to-bumper warranty or powertrain warranty, check your warranty guide or dealer to see if this is covered.
Other people have reported that they cleared the code only for it to return again and again. Keep in mind that most shops can replace the PCM but not all can program it.
Hope this helps to solve it (remember to rate this answer).
A flashing check engine light is indicating the engine is misfiring. This can be caused by a bad spark plug, bad ignition wire, bad ignition coil, bad fuel injector. If the symptom went away it could have been a possible dampness problem in the ignition system and disappeared when it dried. If this is true then it will likely reappear the next time the dampness is there. It may be time for a tune up.
An internal engine problem is a possibility but usually this type of problem does not go away.
Not sure of all what is wrong, but one thing I can suggest is to have your computer codes downloaded to see what it is showing as a fault code. Only a few codes can cause the check engine light to flash, and the most common is a cylinder misfire. Your car most likely has an ignition module or coil pack failing, and that problem is causing most of your symptoms. You can usually get your local autoparts store, such as Autozone, to scan your car for free, and tell you what is tripping the check engine light, and then you can go from there!
Possibly a gas cap not put on tight -or just momentarily removed while engine was running....
Some time later, the system will do a check engine light - the reset...
Same symptom with a few misfires - oxygen sensor gives a bad report - then it goes away.
You will have a history stored - if you want a free reading, go to Autozone and ask for it.