Transmission going out??

Asked by Apr 26, 2018 at 01:36 PM about the 1996 Dodge Grand Caravan

Question type: Maintenance & Repair

I have a 1996 Dodge Grand Caravan.  Within the last month I have replaced
the PCM, crankshaft and camshaft sensors, tension pully and idler pully.  I
have also topped off my transmission fluid.  However, after I got it back from
the dealership who installed my PCM, my van started jerking as it was
shifting.  The "service engine soon" light came on and is giving the code of
P1391 - CMP or CKP Signal Intermittent Condition.  Is my transmission
going out on me or is there something else that I need to have checked out?

1 Answer

40

Both the CMP (Camshaft Sensor) and CKP (Crankshaft Sensor) have a critical clearance or air gap that is set by a thin piece of cardboard glued to the sensor, the idea is to "bottom out" the sensor when installing, and then the cardboard spacer comes off and the gap is set. Make sure they installed both sensors properly, because there is an adjustment bolt holding the sensor in place and it needs to be properly positioned and torqued upon installation. You are doing good to keep a '96 running this long. You didn't give the mileage, and the 3.3 is a sweet engine, but have you been faithfully doing all the other 100,000 mile interval items. I can see you've done a couple of them. The sensors are a hit and miss failure item, no way to tell when they are going to fail, but did you maybe get a another bad sensor, it's been known to happen. Provided they flashed the new PCM properly, i.e. up to date software, I doubt it's in any way related to your transmission. There is communication between The PCM and the Transmission Controller, but there is no way the CMP/CKP signals would affect the transmission. If you are doing fluid and filter replacement at reasonable intervals that 41TE should last a long time. Question: Where is your trans fluid going if it needed to be topped up?

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