Medium and Heavy Trucks
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91-13 is defined as the pedal position was less than 5% or more than 95% movement. Replacing the ECM should not have anything to do with this unless your new ECM is faulty. That would be very rare.
This code is normally caused by a faulty pedal assembly that's moving the TPS too far one way. Or you have a faulty TPS or problem in the wiring that connect to the TPS.
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