C0550

Electronic Control Unit Performance

Car Fault Codes Chassis & brakes

Can you still drive? With care, short trips only

Who can fix it? Needs a specialist or dealer

Typical repair time 1 hour – 5 hours

Typical cost SAR 150 to 6,000

What it means

A chassis control module, most often the ABS module, has detected a fault in its own internal operation during self-test, such as a memory, processor or internal circuit error. The details and detection conditions of this code vary by manufacturer, and the module usually disables ABS, traction control and stability control.

Symptoms4

ABS, traction control (TCS) and stability lights on.
ABS not working, while normal braking remains.
On some vehicles, the scan tool cannot reach the module or other modules store communication codes.
Code sometimes intermittent.

Possible causes5

Internal failure of the module itself.
Low or unstable battery voltage causing a false self-test result.
Poor module ground.
Water in or corrosion of the module connector.
Software fault that the manufacturer fixes with an update on some vehicles.

How to diagnose5

Read codes from this module and all others, and fix low-voltage codes first.
Measure battery and charging voltage and confirm it is stable while running.
Measure power and ground at the module connector per the manufacturer procedure, and inspect the connector for water or corrosion.
Check manufacturer service bulletins for a known software update for this code.
Clear the code and watch for it to return; a return with good voltage and ground confirms a module fault.

How to fix5

Charge or replace the battery and fix the charging system.
Repair the ground, clean the module connector and fix the source of water.
Update the module software if the manufacturer offers an update.
Have the module repaired by a specialist, or replace, program and code it.
Clear the codes, road test and confirm the code does not return.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a battery, ground or software update, and reaches the upper end if the module must be replaced and programmed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Does this code mean the ABS module is bad?

It usually points to an internal fault, but first confirm the battery, ground, connector and any software update, since these can produce the same result.

Can I drive with this code?

Normal braking works, but ABS and stability control may be off, so drive carefully and avoid sudden hard braking until it is repaired.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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