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Can't clear codes


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I have a P0122 TPS code on my 99 Cummins that I cannot get my scanner to clear. When I read the codes it was listed 4 times - twice for confirmed and twice for pending. I told it to clear all codes and I still have one confirmed and one pending remaining. I've tried several times but it won't clear. Any ideas would me helpful.

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My reader is an ACTRON 9575.

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Thanks. I'll try that next time I have time to work on it.

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Has anyone heard of codes stacking in the computer. The light has been on for about a year. I pulled the same TPS code when the CEL first came on but the truck still runs fine. Didn't know if I have like 100 codes on the same error stored on top of each other. Seems unlikely to me but thought I would ask.

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