Detroit Diesel V12-71T Engine Engine

• Overspeed shutdown. Overspeed
  Fix: Check governor and throttle linkages for freedom of movement. Check overspeed switch.
• Overspeed light ON, no shutdown.
  Fix: Disconnect wire at TB11-29. Light ON after reset; replace engine monitor board.
• Overcrank fault lamp lights and engine stops cranking after approximately 75-seconds.
  Fix: See engine service manual for troubleshooting fuel system. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
• Fault lamp lights immediately after engine starts.
  Cause: Overspeed condition as engine starts.
• Fault lamp lights and engine shuts down after running for a period.
  Fix: Check the following: a. Oil level. Engine will shut down if sensor is closed. b. Check engine manual for troubleshooting oil system. c. High engine temperature. Check coolant level; check water flow (city water cooled systems); check radiator for free air flow, and fan belts for tightness. See engine manual for troubleshooting cooling system. d. Check for faulty oil pressure sensor or faulty high engine temperature sensor.
• Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds.
  Fix: See engine service manual for troubleshooting fuel system. After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
• Low oil pressure shutdown. *Low oil pressure
  Fix: Check— a. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
• Low oil pressure light ON. *Low oil pressure
  Fix: Disconnect wire at TB11-30. Light No shutdown. ON after relay reset. Replace engine monitor board.
• High engine temperature shutdown. *High engine temperature
  Fix: Check— a. Coolant level. Replenish if necessary. b. City water cooled sets. Check water flow, valves, etc. c. Check sensor; check thermostat. d. Radiator model, check fan belts, radiator for obstructions, etc.
• High engine temperature light ON. *High engine temperature
  Fix: Disconnect wire at TB11-31. Light No shutdown. ON after relay reset. Replace engine monitor board.
• Fault lamp lights, no fault exists.
  Fix: To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31. If fault lamp lights with leads disconnected, replace engine monitor board. Reconnect leads.
• Engine runs, shuts down, cranks for 75-seconds, cranking cycle stops, Overcrank light ON.
  Fix: Check fuel supply.
• Engine runs, shuts down and cranks for 75-seconds. Cranking cycle stops; fault lamp lights.
  Fix: Check fuel supply.
• *Low oil pressure shutdown. *Low oil pressure shutdown
  Cause: A. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
• *Low oil pressure light ON. No shutdown. *Low oil pressure light ON
  Fix: Disconnect wire at TB11-30. Light ON after relay reset. Replace engine monitor board.

Compiled from service & troubleshooting documentation across every generator set that uses the Detroit Diesel V12-71T.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.