2751010 - C21 THE GEARBOX IS STUCK'

It remains stuck in one gear and, when the vehicle stops, the engine cuts out and cannot be started up again or it starts again after a few minutes. Preliminary check: If during engine starting you notice that the starter motor works normally, the problem is caused by other systems (engine management, ABS, fuel pump). Refer to specific charts. If the starter motor does not turn (after checking its operation and the relevant electrical supply circuit), continue with the next diagnosis chart.
Results of the tests
0CONTROL UNIT ERRORS CHECKAll OKProblems metOperation

Check that there are no control unit errors. In particular:

  • Clutch sensor error
  • Clutch solenoid valve current error
  • Pump relay error
  • Load relay error
  • Selespeed pump error
Continue to Step 4Presence of one or more of the errors included in the list Continue to Step 1
1CHECKS ON FAULTS DETECTEDAll OKProblems metOperation
Check the faults according to the See Test   2127I  What to do for error in Selespeed control unit End of diagnosisConnections fault (Clutch sensor, Pump relay, Load relay and/or Selespeed pump) Repair/replace the wiringContinue to Step 3
The active diganosis is not successful and there are no faults detected at the wiring (Clutch solenoid valve) Continue to Step 2
Faulty pump relay and/or fuse (Selespeed pump) Replace the componentContinue to Step 3
Faults on pump winding (Selespeed pump) Replace the component Op.   2127C30  Continue to Step 3
2AFTER THE SOLENOID VALVE ACTIVE DIAGNOSISAll OKProblems metOperation
If this step has been reached for the active diagnosis of the clutch solenoid valve, replace it Op.   2127C56  and check the operation by carrying out a C.M.Continue to Step 4.
3AFTER THE CHECKS ON THE FAULTS DETECTEDAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persists Continue to Step 4
4OIL LEVEL CHECKAll OKProblems metOperation
Check the oil level as described in See Test   2127B  OIL LEVEL CHECK Continue to Step 6Level below the Max reference Top up the oil levelContinue to Step 5
Level above the Max reference Reduce to the Max levelContinue to Step 6
5CHECK FOR OIL LEAKSAll OKProblems metOperation
Check that there are no oil leaks as described in See Test   2127C  CHECK FOR OIL LEAKS Continue to Step 6OIl leaks detected Replace/repair the parts concerned, and top up the oil levelContinue to Step 5
6OIL PRESSURE CHECKAll OKProblems metOperation
Check the oil pressure as described in See Test   2127D  OIL PRESSURE CHECK Continue to Step 8Pressure < 40 bar Continue to Step 7
7ELECTRIC PUMP OPERATION CHECKAll OKProblems metOperation
Check the correct operation of the pump as described in See Test   2127E  ELECTRIC PUMP OPERATION CHECK Continue to Step 8Voltage below 11 V Check the batteryContinue to Step 7
It is not possible to make gear changes from the lever Activate the 'clutch bleed' service from the Examiner Plus or Smart to activate the pumpContinue to Step 8
8CHECK THE LAYOUT OF THE CLUTCH SENSOR WIRINGAll OKProblems metOperation
Check the state of the connections, continuity of the wiring (it is important to pay particular to the layout of the clutch position sensor wiring in the engine compartment: the wire must not be too taut, and it must have sufficient slack)
Continue to Step 9There is a fault Repair/replace the part that is not workingContinue to Step 9
9CHECK THAT THE FAULT IS NO LONGER PRESENTAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persists Contact Technical Service for further information on the problem