P1493 code Hi,I own a 2002 Dodge Ram 2500 4x4 sport.Check engine light is coming on.p1493 code came on about 3 months ago.checked connection at battery tray 3 months ago,cleaned,put a little of dielectric grease for good contact,cleared code.Engine light stayed off till a week ago,checked,p1493 code retrieved, replaced battery temp sensor,cleared code. After driving truck about 5 mi...,-code still coming on..? What else should I try?

number 9
https://fuse-box.info/dodge/dodge-ram-1500-2500-3500-1994-2001-fuses-and-relays
https://www.youtube.com/watch?v=uzAA9-XL2nU

There is no standard interval for the CE/MIL light. You need to get the codes scanned at a local AP store to see what codes you have.

P1684 - Less than 50 Key On's.
P0302 - Misfire at Cylinder #2
P1493 - Ambient/Battery Temperature Sensor Input voltage too low.
Oil Light with the correct oil level = Oil Pressure/Sending Sensor.

If it where me I would start considering the only common part between all these effected systems. The ECM although the dealer should be able to say for sure. They have a machine that actually replaces the ECM and can simulate all the sensors. I had to say it but you may need to take it to a dealer for complete diagnostics and repair since the machine is a dealer only type machine.

check your antifreez . that would make check engine light come on and no heat

Have it sacnned for a code. it seems to be the speed sensor at the tranny.or the crankshaft position sensor. hope this helps. will you please vote ?

Have it scanned for a code. it could be a variety of things that are wrong. And I am almost sure it is a sensor. Specially the cranshaft position sensor or the Idle position sensor.

P1493 Battery Temp. Sensor, Low Voltage
P0117 ECT Sensor, Low voltage

Make sure the engine is reaching operating temperature, U may have a problem w/the thermostat, this is code P0117

Have the battery and the Alternator tested for possiable charging system issue, this is code P1493

P1493 Battery Temp. Sensor, Low Voltage,Solution: have the Battery and the Alternator tested, Auto Zone and Kragen as well as others do this for free. I suspect your Alternator is the problem.

if you van has a security system in it, it could be causing this problem. they usually disable the starter circuit. Paul has listed good places to start. but if they don't fix it do this: when your trying to start but its not working have some one check voltage at the starter. there are 3 points to check 1: where battery cable connects 2: where starter connects to solenoid 3: small wire that operates solenoid. if there is voltage at all three point replace starter it has a shorted / open spot on armature. voltage at 1 and 3 but not 2 replace solenoid. voltage at 1 but not at 3 and you have already checked the items Paul identified check wiring between neutral safety switch and solenoid.