Eaton Cummins Endurant Fault Code
Free · no signupSPN 522125 FMI 02
Transmission Jumps Out of Gear / Neutral
System
Shift Rail
Symptom
Transmission Jumps Out of Gear / Neutral
Diagnosis & fix steps
LOGIC: Shift Rail A Position Sensor Signal Irrational.
ACTION: Inspect Shift Rail A magnetic position target inside the upper shift cover. Check Hall-effect position sensor output sweep; inspect shift fork pads for bronze wear debris.
Red Seal field insights
Shift Verification: If the magnetic target vibrates or slides off position, the TCM cannot confirm gear engagement and commands an immediate drop back to Neutral to prevent gear stripping.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
Track this across your whole fleet
This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.
Start your free trial