P1830
Gear Function. Mechanical Fault.
Fault symptoms
CHECK GEARBOX warning lamp on.
TCM in Limp-Home mode.
Slippage in the transmission.
Conditions
The difference between input shaft speed and output shaft speed (speed of the car) is more than 10% above the gear ratio for more than 5 seconds.
Diagnosis will not be performed if:
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1.
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TCM is in Limp-Home mode.
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2.
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Car speed is below 25 km/h.
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3.
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The selector lever is in P, R or N.
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4.
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The accelerator position is less than 10%.
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5.
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The fluid temperature is lower than 20°C.
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6.
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Less than 10 seconds has elapsed since shifting occurred.
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7.
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Engine speed is below 400 rpm.
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8.
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DTC 1817 or 1822 has been generated.
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Diagnostic help
The control module calculates the ratio between input and output shaft speed. For each gear there is a definite relationship, depending on the ratio. The fault indicates a mechanical malfunction. Wear in the transmission may be the cause of abrupt shifting and an inoperative Lock-up function.
Diagnostic procedure
1 Check the fault symptom
Check the problem by driving the car following the test drive schedule, see
Test drive schedule
. Note any fault symptoms.
Are there any fault symptoms?
Continue with
Mechanic and hydraulic faults
and then with step 2.
Continue with step 2.
2 Final check
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Clear all diagnostic trouble codes in the system.
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Perform a driving cycle:
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Drive the car at varying loads and engine speeds for 5 minutes.
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Evaluate the driving cycle:
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Make sure the trouble code has not recurred.
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Has the trouble code recurred?
Continue with
Diagnostic procedure before replacing control module
The steps taken to rectify the fault were correct.
