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Fault code 29 on Allison 4500 trans


Jdiesel25

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  • 3 weeks later...

AT work ( county highway dept.) we have 6 2007 Internationals 7600 with the 4000 Allison auto, we have had more trouble with wiring going to the transmission than anything else. every year they are looking for bad spots in the wiring because it throws codes or wont move PITA.

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I work on Toronto transit buses as well. We go through Allison harness like crazy. We don't even repair them anymore. The loom wears through the coating on the wires. We repair them in one section and 6 months later the break in another. Its been that way since the early 2000's with those cheap harness. Same trans 4000 series.

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