Allison Transmission Equipped Vehicles With Shift Quality Concerns And No DTC - keywords flare harsh shift shudder slip

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Vehicle may exhibit various symptoms regarding Shift quality, Intermittent / Inoperative and/or Transmission Control Module (TCM) may have Diagnostic Trouble Codes (DTC) in history or may be active.

Question the customer of details of how vehicle was being used when concern occurs such as, towing or unhooking from a heavy load and if Tow/Haul is being used during concern.

Inspect transmission Input, Turbine and Output speed signals for being erratic or dropping out. An erratic transmission input signal may cause TCC and ABS events that could affect shift quality. Also check Engine Coolant Temperature (ETC) and Throttle Position Calculation (TPC) for unusual or erratic readings.

If your dealership has a vehicle that exhibits the symptoms listed whereas labor code "K9995", "Customer Concern not Duplicated"(CCND) will be file on the warranty claim please contact; John Janssen 317-242-4039 or Rick Taylor 317-242-4038 or Larry Hansen 317-242-3704.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.