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Re: u2105 allison trans code--thomas school bus
Posted to HD/Fleet Forum on 8/23/2013

This code u2105 is now code u0100. It is set when no engine torque or throttle messages are received for 3 seconds or more. You may want to check the engine for like fault codes or event codes in case you have a caterpillar engine. You may also want to wiggle... Login to read more.