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Discussion Starter · #1 ·
Other day my MIL came on then truck died,was able to restart and get home. codes came up P0344 CPS. I replaced crank sensor. Drove beautiful for 10 mins and bam again. I also pulled the cam sensor and cleanned and am now getting both sensor errors. Rest pcm and MIL wont go out.Any suggestions much appreciated.
 

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Other day my MIL came on then truck died,was able to restart and get home. codes came up P0344 CPS. I replaced crank sensor. Drove beautiful for 10 mins and bam again. I also pulled the cam sensor and cleanned and am now getting both sensor errors. Rest pcm and MIL wont go out.Any suggestions much appreciated.

You have an intermittent camshaft sensor. These are hall effect solid state
devices and different completely from the crankshaft sensor.

I had a 1999 Dodge Ram V8 that developed a strange symptom with no
P-xxx error codes. Truck would start..run for 10-15 minutes then die
like it had no ignition or gas at the injectors. Waited for 20 minutes and
it would restart, but not before the engine cooled off a bit and the same
thing happened.
Replaced crankshaft sensor..same symptom.
Replaced camshaft sensor..problem solved.
You can't clean them..just replace them.
 

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Discussion Starter · #3 ·
Thanks Carverman. Yes I replaced the cam sensor and all is well. Only issue I have now is if I am driving and then stop and either go from drive to reverse or drive to park it dies. No sputter or cough just gone like you turned off the key. Will restart but didnt happen prior.
 

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Thanks Carverman. Yes I replaced the cam sensor and all is well. Only issue I have now is if I am driving and then stop and either go from drive to reverse or drive to park it dies. No sputter or cough just gone like you turned off the key. Will restart but didnt happen prior.
This only happens when you move the shift lever from drive to park or
drive to reverse? Sounds like the Park/Neutral safety switch located
on the transmission near the shift lever. It is sensed by the PCM
(pin 6 C1, park/neutral switch sense). What the PCM does when it
doesn't get the correct sense..I don't know, but it probably kills the
ignition on you.
 

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Discussion Starter · #5 ·
Yeah Carverman that was my thoughts as well. I have since when I stop I wait a few seconds then slowly shift to park and its fine. after doing this several times it starting to get better.So may have needed for PCM to get correct parameters after reset.
 

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Yeah Carverman that was my thoughts as well. I have since when I stop I wait a few seconds then slowly shift to park and its fine. after doing this several times it starting to get better.So may have needed for PCM to get correct parameters after reset.
I looked into it a bit further and the Park-Neutral safety switch has more
to do with the starting circuit, and not the delay you are experiencing with the transmission.

The transmission shifting is controlled by the PCM.
There is a fused 20amp transmission control relay in the PDC which supplies battery power to
the 1) Variable force solenoid, 2) Overdrive solenoid and 3)
Torque convertor clutch solenoid. The ground portion
of these 3 transmission solenoids come from the PCM.

The PCM senses the pressure through the governor pressure sensor
in the transmission valve body. The governor pressure valve in PARK
position, allows the fluid to recirculate through the governor pressure
valve and manual valves back to the sump while the torque convertor
is filling.

(some techno jargon regarding the governor pressure regulator)
At low (transmission) pump speeds, the flow is controlled by the pressure valve
to reduce pressure to the torque converter.
(After the torque converter and switch valve fill with fluid, the switch
valve becomes the controlling metering device for torque converter pressure.)
**The regulator valve then begins to control the line pressure for the other transmission circuits.

The balance of the fluid pressure pushing the valve to the right and the spring
pressure pushing to the left determines the size of the metering passage.
lt causes the pressure to reduce and the spring decreases the size of the
metering passage. Pressure is regulated by this constant balance of hydraulic and spring pressure​
 
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