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.
ABS pump and control module Lancia Fiat Alfa Romeo TRW 52003820 18552013 18551814C 54086610D
Vendors's code: 52003820
Product code: 54086610D
Barcode:
Code 39:
ISBN:
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How do you get from ABS symptoms to part number 52003820 on a Lancia, Fiat or Alfa?
Diagnosis first, four numbers last: 52003820, 18552013, 18551814C and 54086610D. The unit is used, in working order and original.
Lancia, Fiat, Alfa Romeo: ABS unit 52003820 - from fault to part numbers
The listing title names three makes: Lancia, Fiat and Alfa Romeo. We do not claim the unit applies to all of them, and we do not state the model - selection is by part numbers. Read the listing like a short set of instructions: first establish what is happening, then read the fault codes, next check the surrounding parts of the system and only then compare the four numbers. The pump and control module unit is used, in working order and original.
Stage four: four numbers to compare
- 52003820 - part number (OEM): 52003820
- 18552013 - additional number given in the listing: 18552013
- 18551814C - additional number given in the listing: 18551814C (written 18551814-C in the title)
- 54086610D - part number (OEM): 54086610D
None of these numbers is assigned here to the pump or to the control module, so compare all of them. The forms 18551814-C and 18551814C are the same number, written with or without a hyphen.
Stage one: symptoms
If your car shows anything from the list below, it is worth moving on to the next stages:
- the ABS warning light comes on and stays on,
- the anti-skid system stops responding on a slippery surface,
- the tester shows a hydraulic pump or valve fault,
- the ABS module does not respond to diagnostic queries.
Stage two: read the fault codes. Stage three: check the wheel sensors, connectors and fuses. Only then decide on the part. After replacing the unit, bleed the brakes. If the workshop decides the module needs configuring, it will do this with a tester.
Answers to common questions
| Does the part apply to all three makes in the title? |
|---|
| We do not assume that. The makes are listed as in the title, and selection is by part numbers. |
| Which number should I enter in the catalogue search? |
| You can start with 52003820, then check the other three. |
| Is 18551814C a different number from 18551814-C? |
| No, it is the same number written in two ways. |
| What if I only have two of the four numbers? |
| Send them to us. We will compare them with the list and tell you what matches. |
Before you order, copy the numbers from your part and send them to us. We will check them against the list in this listing.