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6.5L Turbo Diesel 1992-00 6.5L Turbo Diesel - Welcome to the Internet's first discussion forum for the 6.5L diesel engine. Tips on performance, cooling, fuel economy, troubleshooting and more.

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  #1  
Old 06-29-2018, 02:22 PM
94GMC2500 94GMC2500 is offline
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Question Codes 84 and 99

I have 84 and 99 codes on my 95 k3500. Is this a indication the APP is bad or something else?

Some times the pedal feels like it has a dead spot in it.
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1995 K3500 Silverado extended cab dually auto trans. Diamond Eye exhaust, KOJO chip, manual boost control, HD cooling, PMD behind bumper, modified fan clutch.
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Old 06-30-2018, 06:04 AM
Warren96 Warren96 is offline
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Did you swap the PMD yet? Are these the only codes set?
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Old 06-30-2018, 07:32 AM
94GMC2500 94GMC2500 is offline
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Only 84 and 99 codes, new pmd about a year ago.
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1995 K3500 Silverado extended cab dually auto trans. Diamond Eye exhaust, KOJO chip, manual boost control, HD cooling, PMD behind bumper, modified fan clutch.
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Old 06-30-2018, 10:00 AM
94GMC2500 94GMC2500 is offline
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Question

Is there a way to test the accelerator pedal position sensor?
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1995 K3500 Silverado extended cab dually auto trans. Diamond Eye exhaust, KOJO chip, manual boost control, HD cooling, PMD behind bumper, modified fan clutch.
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Old 06-30-2018, 11:43 AM
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DmaxMaverick DmaxMaverick is offline
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Quote:
Originally Posted by 94GMC2500 View Post
Is there a way to test the accelerator pedal position sensor?
Yes, and your truck's PCM already did. All you can do is check the connections and/or replace the module. The APP has 3 independent/redundant circuits. If one fails (or if all 3 don't agree), it warns you, and the SES and STS (Service Throttle Soon) lamps should be on. If 2 fail, it limps. If 3 fail, it doesn't work.
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Old 06-30-2018, 01:58 PM
94GMC2500 94GMC2500 is offline
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Thanks for the info!
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