Dead pedal on start up - Dodge Cummins Diesel Forum
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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post #1 of 48 (permalink) Old 11-18-2019, 09:54 AM Thread Starter
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Dead pedal on start up

I have a 98.5 24v. I’ve read the dead pedal threads but my issue seems different. On occasion, I’ll have no throttle response but only after starting the truck. It hasn’t happened driving down the road. And if I shut the truck off and restart, it usually works fine. I do have the P0122 code (I believe) low voltage for Apps. Anyone have any idea? The APPS was replaced not long ago. Thanks


Back in it after a few years out of the truck game. 2014 2500 Mega 6 speed. Deleted and tuned with EFI live, 5 exhaust, south bend dual disc. More to come when I figure it all out.
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post #2 of 48 (permalink) Old 11-18-2019, 11:18 AM
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The codes need checking with a code reader to see if anything else is going on now.

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post #3 of 48 (permalink) Old 11-18-2019, 12:05 PM Thread Starter
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I got the P1693 and the P0122. I just adjusted it to show .60 volts so we’ll see if that helps

Back in it after a few years out of the truck game. 2014 2500 Mega 6 speed. Deleted and tuned with EFI live, 5 exhaust, south bend dual disc. More to come when I figure it all out.
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post #4 of 48 (permalink) Old 11-19-2019, 04:11 AM
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.60 output on #3 wire is not the one being measured, but it is the idle voltage. It should actually be about .5v, under .529, unless you have a Timbo, and if so that may be he problem.
Low voltage to sensor is the input and should be 5 volts on a different wire. Occasionally the problem is a bad APPS. More often it is dirty corroded, even mildly, battery terminals(often driver neg) or cables. Clean all terminals for perfect metal to metal connection and check cables for corrosion.

Do you have a Timbo apps, the one with a pigtail hanging down 2"?
They are especially an issue on 98.5 and 99 trucks casueing the truck ECM to think it is accelerating when it is not, surging at idle and other wise sometimes.

Also does the tach always look like it is accurate, not bouncy or low? If either you have a bad Crankshaft sensor.

The truck starts and runs for about 5 seconds from a computerized Crank signal for timing, the the sensor takes over. Does not sound like your problem, but.

It could be an ECM problem. What does the wait to start light do when you turn the key to ON? Does it always come on for at least a second?
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post #5 of 48 (permalink) Old 11-19-2019, 06:57 PM
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I just replaced the batteries 2 weeks ago but I'll check the cables. I don't have a Timbo. The tach looks accurate, however I've had an issue with the truck loping on first start up and then dying. It's not every time and I've never had dead pedal while driving. Only on start up. The wait to start always lights, sometimes it seems like its on for too long, but it's been a while since I've been in a 2nd gen so maybe not. So I should adjust the number 3 wire down to .5? Thanks for your time and trying to help.

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post #6 of 48 (permalink) Old 11-19-2019, 11:41 PM Thread Starter
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Sorry for any confusion, I see sometimes this logs me in as NukeBrigade, other times as Eric. They are both me.

Back in it after a few years out of the truck game. 2014 2500 Mega 6 speed. Deleted and tuned with EFI live, 5 exhaust, south bend dual disc. More to come when I figure it all out.
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post #7 of 48 (permalink) Old 11-20-2019, 12:18 AM
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Just close the Nuke account becasue you have more posts and privileges on Eric. Send a note to admin if you have to.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #8 of 48 (permalink) Old 11-20-2019, 06:14 PM
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how do I post a video on here??

98.5 stock other than exhaust and air intake......for now.

14 mega cab g56. deleted and tuned, nothing fancy.
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post #9 of 48 (permalink) Old 11-21-2019, 01:37 AM
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Couple of ways but best is to upload a link.(cut and paste to body or upload box below.) Yours will have to be approved by Admin before it will post becasue you are a newbie. May take a couple of hours or couple of days.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #10 of 48 (permalink) Old 11-21-2019, 08:33 PM
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https://youtu.be/X3ymMOGA1Co

98.5 stock other than exhaust and air intake......for now.

14 mega cab g56. deleted and tuned, nothing fancy.
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post #11 of 48 (permalink) Old 11-21-2019, 08:34 PM
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theres a quick video of what its doing.

98.5 stock other than exhaust and air intake......for now.

14 mega cab g56. deleted and tuned, nothing fancy.
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post #12 of 48 (permalink) Old 11-21-2019, 09:54 PM
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I haven't had a chance to look at the responses but have checked the lift pump? I always look at ground connections too but this sounds like it's starving for fuel.
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