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Eaton Gen 2 (AutoShift) Fault Code: 42 PID: SID 61 FMI: 7 Splitter failed to Engage

Overview:
Fault Code 42 indicates the transmission is unable to complete a shift across the Splitter. The Splitter is either stuck in HI or LO, or cannot complete engagement into HI or LO.

Detection:
The transmission attempts the same splitter shift 5 consecutive times and determines the shift cannot be completed based on the speeds across the back box.

Fallback:
This fault causes a 9-speed fallback and the transmission stays in either LO split or HI split.

Possible Causes:
1) Low air pressure
2) Contaminated air supply
3) Air leak
4) Splitter valve
5) Splitter Actuator, Cylinder, Piston or Yoke

Shop Talk:
Operate vehicle and perform several range up shifts and down shifts. The failure is detected after 5 consecutive attempts to complete the same type of range shift. Several shifts (10 or more) may be necessary before the controller confirms the failure.

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