A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
Automatic gearbox control unit Ford 7G9N14C336DB
Vendors's code: 7G9N14C336DB
Product code: 4BF0-462D9
Barcode:
Code 39:
ISBN:
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Gearbox control unit for the Ford - what should you check before buying?
This is a used, working automatic gearbox control unit for the Ford - numbers 7G9N-14C336-DB / 7G9N14C336DB. Before buying, compare the numbers with the label on the unit in your car.
Automatic gearbox control unit Ford
For the Ford we offer a used gearbox control unit, working and in good condition.
Numbers to compare
- 7G9N-14C336-DB / 7G9N14C336DB - manufacturer number
Fitment
Compare the number 7G9N-14C336-DB in full with the number on your unit. Different versions were fitted to the same models, so the number decides, not the model alone.
Signs of a faulty gearbox control unit
- the gearbox warning light stays on after starting the engine,
- the gearbox will not shift into higher gears,
- gears change on their own,
- the diagnostic tool cannot see the unit or reports a fault in it.
Reading the fault codes with a diagnostic tool helps tell a control unit fault from a failure of sensors, solenoid valves or the gearbox itself.
Questions and answers
| Is the control unit new? |
|---|
| The control unit is used but working. It comes with a 6-month warranty. |
| Which number matters most for fitment? |
| It is best to compare all the numbers on the label, above all the one marked as the manufacturer or OEM number. |
| What should I check on delivery? |
| Check that the numbers on the unit match the description and that the connector and housing show no visible damage. |
Send fitment questions to contact@auto24parts.com - give the model, year and the number on the unit.