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Discussion Starter · #1 ·
Just bought a 2002 Dodge Grand Caravan Sport, 3.3L V6 engine.

The previous owner had the struts changed and a front end alignment, both by a backyarder buddy of his, and according to him that's when the trouble started.

When I start the van, the PRND3L display outlines all selections as though every gear is engaged. It still shifts normally (well - except automatic up & down shifting... more on that in a sec), but one can't tell what gear one is in without counting notches while shifting.

The Brake, ABS, and Service Engine lights remain solidly illuminated.

The transmission is in limp mode and won't shift past 2nd gear. Driving the van home on the highway was a 5,400rpm treat.

The odometer doesn't gain a single KM, nor does the speedo register any movement.

I was told about the faulty speedo by the vendor, so I brought a replacement output speed sensor. Swapped the new OSS into the tranny, but no bueno.

I ran a cluster diagnostic and it came back with:

100.1 ABS Comm Fault
100.3 EATX Comm Fault
100.4 FCM Comm Fault
100.5 ORC Comm Fault
100.6 SBEC/DEC/MCM Comm Fault
400.1 Improper Power Down

Key cycle codes reveal p1684, p0500, p1698

I gather the 100.1 was from the chap working on the struts - he likely didn't reconnect an ABS sensor properly.

400.1 is from disconnecting the battery, yes? How does one clear that code?

Ideas on how to mend & clear the remaining comm faults would be greatly appreciated. Would a TCM ground fault trigger those other codes?
 

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Discussion Starter · #3 ·
I pulled the cluster to change a bulb, and when I replaced it all but the 100.3 EATX com and 400.1 batt disconnect codes were gone... but now there's a 100.0 loop back error as well.

Is this twisted pair bus within the pigtail that connects to the cluster? Is the bus located within the cluster?

Do '02s have pin mount soldering issues like the Gen IIIs do? I did open the cluster to check the soldering, but all appeared well.
 

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Discussion Starter · #5 ·
as I said all the P codes, including the P1698, are gone save for the battery disconnect one. Now I just get the 100.0 loop back and 100.3 EATX comm errors. Not sure if that means bad bus or bad TCM though.
 

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Discussion Starter · #6 ·
no one knows?
 
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