Tcc? O/d? Lock Unlock Fix? - Page 2 - Dodge Cummins Diesel Forum
Diesel Polls Cummins Forum Official Polls

View Poll Results: TCC OR O/D Locking Unlocking At Highway Speeds
TPS Cleaning or Replaced 37 23.57%
Battery Cable cleaning 37 23.57%
Replaced Battery's 8 5.10%
Valve Body 9 5.73%
T/C 14 8.92%
Valve body and T/C 19 12.10%
PCM Re-flash 7 4.46%
DTT Volt regulator 3 1.91%
Noise Filter 28 17.83%
Alternator 6 3.82%
Or Othere 46 29.30%
Multiple Choice Poll. Voters: 157. You may not vote on this poll

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post #13 of 27 (permalink) Old 09-15-2007, 02:38 PM
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Originally Posted by flubyux2 View Post
i did it ALL except buying a noise filter from an aftermarket source

Remove engine harness and install braided noise sheilding on TPS wires from TPS to PCM and on Trans control wires from Trans to PCM. (this precludes the need for a noise filter since the braided sheilding prevents the noise from entering the wires intially)

Ground PCM case w/ 8awg fine-strand cable to negative battery ground

Replace Ground cables on battery

Replace Gov Press sensor and Gov solenoid

Replace trans fluid and filter

Replace Output shaft speed sensor

Remanufacture PCM

Rebuild Generator.

my Gov sensor/solenoid were faulty and that got my PCM out of limp and allowed it to shift normally. however, nighttime driving made the TC lockup, OD/D shifting problem apparant. i knew it was dependant on electrical load since it only happened at night, when running the lighting increased the Generator load dramatically. turns out the brush in the generator was worn down to the shoe and was arcing out on the armature. this acring created RFI which was introduced into the harness and the PCM via inductance. replacing this brush (even though my truck produced 14v while running and showed no evident signs of failure) solved my shifting problems 100% . my truck is now shifts as strongly, predictably and reliably as it did when it first rolled of the Lot.

Moral of the story; REBUILD YOUR GENERATOR FIRST, before buying ANYTHING else.
Thanks for the reply i tried to test the voltage on the tps the other day and i drilled the tps so i could adjust it this did not work so i drilled 2 small holes in the case of the tps about the size of the spray wand on a electrical contact spray can and i sprayed electrical contact cleaner in one of the holes and a bunch of dirt came out the other one and then i sealed th 2 small holes with silicone and the truck shifts fine now but it has only been a week,i still have my fingers crossed.But i still do not understand why the new tps i bought from dodge will not work at all,you would think a new one would fix the problem but it will not shift to o/d or lock up a all with the new one?

1996 3500 2wd,modified trans.&torque converter,HTB2 62/14 turbo,#10 fuel plate,4"exhaust,autometer pyro&boost gauges.
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post #14 of 27 (permalink) Old 09-15-2007, 09:31 PM
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well, did you calibrate your TPS like the article on Cummins Database describes? if you did, then you may be getting inductive interference in your TPS circuit from the generator. look for a starter/generator/alternator repair shop. the guy who i took my Gen to tested it beforehand, tore it down, inspected it, replaced the brush, cleaned it, reassembled it and re-tested it again. initial output was about 90Amps. With the new brush installed, it put out over 120Amps with no arcing.

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post #15 of 27 (permalink) Old 02-29-2008, 06:43 PM
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I cleaned the battery cable and reran the ground from the PCM
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post #16 of 27 (permalink) Old 04-01-2009, 04:31 PM
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TPS and Torque Converter..have had both replaced on mine.

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post #17 of 27 (permalink) Old 04-01-2009, 04:45 PM
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Not trying to sell product here because we make about 2 bucks on them but 90% of the time we find that our BD Noise Isolator Kits are the fix. If not we find a bad TPS is the culprit

They are under $10.00
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post #18 of 27 (permalink) Old 04-01-2009, 07:31 PM
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The easiest way to test this is to simply disconnecting the alternator and take the truck for a drive. If if shifts properly then it's the alternator, if it remains the same probably one of the other problems described. I unplugged mine and it shifted perfectly. I then cleaned the terminals on the back of the alternator and it's been working great since Jan.

I tried the pcm ground method and it worked for a while but the problem returned in a month.

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post #19 of 27 (permalink) Old 04-05-2009, 09:24 PM
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DTT Noise Filter
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post #20 of 27 (permalink) Old 04-16-2010, 12:21 PM
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WHAT ABOUT Nothing has fixxed this b!tch......

2014 3500 Laramie... money maker.
A couple 2015 Camaros... money wasters.
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post #21 of 27 (permalink) Old 05-28-2010, 05:45 PM
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I had an oddity, my battery terminal failed....

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post #22 of 27 (permalink) Old 05-28-2010, 11:16 PM
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I cant beleive noise filter is not leading the pack
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post #23 of 27 (permalink) Old 07-09-2010, 10:08 PM
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Timbo's APPS fixed mine. I went through all the free fixes and was going to buy the noise filter but I decided to try the APPS.

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post #24 of 27 (permalink) Old 07-09-2010, 11:04 PM
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Mine was the ground strap in the drivers wheel well! shifting perfectly then I removed the nose for service and TC lock/unlock started. I removed the strap, sanded the surface and re-assembled problem solved.
IMHO, the noise filter works most of the time as a band-aid to mask the real issue of electrical short (such as alt issues or bad grounds) and do not really SOLVE the problem.

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