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.
Front Electronic Module FEM Jaguar S-Type XW4T-13B525-BF XW4T13B525BF
Vendors's code: XW4T13B525BF
Product code: 24C4-24797
Barcode:
Code 39:
ISBN:
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Will the XW4T-13B525-BF module fit your Jaguar S-Type?
This is a used, fully working Front Electronic Module (FEM-B) with part number XW4T-13B525-BF, also written without dashes as XW4T13B525BF. It fits if the label on the module in your S-Type shows the same number – we are happy to check this with you before you buy.
Front Electronic Module FEM Jaguar S-Type XW4T-13B525-BF
The XW4T-13B525-BF is the front body electronics module of the Jaguar S-Type, labelled Front Electronic Module and marked FEM-B. It is not an engine ECU: the module handles body electronics and works together with the car’s other control modules. The manufacturer marks it as a programmable part.
Numbers to check
- XW4T-13B525-BF – part number on the label
- XW4T13B525BF – the same number written without dashes
- FEM-B – module type marking
You will find the label on the casing of the module fitted to your car. Match the part by its number rather than by model alone: FEM modules with different part numbers were used on the S-Type.
Signs of a faulty FEM
- no communication with the module during diagnostics,
- communication fault codes stored in other modules,
- electrical functions handled by the module not working properly,
- damage after water ingress, a voltage spike or a failed programming attempt.
Before replacing the module, check the fuses, power supply, earths and connectors – a damaged wiring loom can cause similar symptoms.
Programming after fitting
A used XW4T-13B525-BF module comes from another car, so after fitting it usually has to be programmed and configured for your vehicle with a diagnostic tool.
Questions and answers
| Is the XW4T-13B525-BF an engine ECU? |
|---|
| No. It is the front body electronics module (FEM). The engine ECU is a separate part with a different number. |
| Is XW4T13B525BF the same part? |
| Yes. It is the same number, just written without dashes. |
| What details should I send before ordering? |
| The number from the label of your current module, or a clear photo of it, plus your VIN. Based on that, we will confirm the fit. |
| What condition is the module in? |
| It is a used part, fully working and in good condition. The warranty period is shown in the product features table. |
Any questions? Email contact@auto24parts.com with the number from your module’s label – we will check the fit for you.