- Vehicles
- Cars
Start-Stop system fault
SEAT Start-Stop system fault in car: function not available
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
'Start-Stop system: Fault! Function not available' means the system has a fault and SEAT asks you to take it to a workshop. If you only see the unavailable lamp, conditions are usually not met (cold engine, low battery, climate control).
Safety first
Stop and check this first
- When Start-Stop stops the engine, the ignition stays on: switch the ignition off before leaving or the battery will drain. Never stop the engine before the car has come to a complete stop.
- If you tow with a towbar not fitted by SEAT, always switch Start-Stop off manually; otherwise the brake system may fail.
Safe checks you can perform
- Read which message appears
- Review the basic conditions
- Check the console button
Leave these tasks to a qualified professional
- Do not attempt this professional task: Diagnosis of the Start-Stop fault
- Do not attempt this professional task: 12-volt battery check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Diagnosis of the Start-Stop fault
What they doThe workshop reads the fault memory related to Start-Stop and energy management to find why the system reports a fault.
They must show youthe fault memory readout with stored or pending codes.
In writingthe codes found, the repair done and whether codes were cleared before or after the repair.
12-volt battery check
What they doBecause a very low battery stops Start-Stop from working, the workshop checks its state of charge and capacity.
They must show youthe battery test result with measured voltage and state of charge.
In writingthe measured voltage, the battery condition and whether it was replaced.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Read which message appears
- Who:
- you, with the car parked somewhere safe.
- How:
- tell apart the unavailable lamp, the notice 'Start-Stop system deactivated. Start the engine manually' and the message 'Start-Stop system: Fault! Function not available'. More information is in the Infotainment system: function button > View > Vehicle status.
- Result that matters:
- knowing whether it is a temporary condition or a system fault.
- If the fault message appears:
- book the car into a workshop.
- If only the unavailable lamp appears:
- review the operating conditions.
- Evidence to keep:
- photo of the message and of the vehicle status screen.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
Review the basic conditions
- Who:
- you, at the wheel.
- How:
- check what SEAT requires: driver door and bonnet closed, driver's belt fastened, engine at operating temperature, reverse not engaged and no steep slope. Also consider the climate control and defrost settings.
- Result that matters:
- ruling out that the system is simply waiting for its conditions.
- If a condition was missing:
- the system works again once it is met.
- If all are met on a long drive and it still does not work:
- it may be the battery or a fault; have it checked.
- Evidence to keep:
- note of outside temperature, the trip and whether climate control was on.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
Check the console button
- Who:
- you, with the engine running.
- How:
- press the Start-Stop button on the centre console, which switches the system on or off manually, and see whether the lamp changes.
- Result that matters:
- knowing whether the system had been switched off manually.
- If the lamp changes and the system stops the engine again:
- it had been switched off with the button.
- If nothing changes:
- go to a workshop.
- Evidence to keep:
- photo of the lamp before and after pressing.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Vehicles
- Brand
- SEAT
- Product type
- Cars
Known code variants
- SEAT Ateca Start-Stop avería
- SEAT Ateca Start-Stop fault
- SEAT Start-Stop not working
- Sistema Start-Stop desactivado. Arranque el motor manualmente
- Sistema Start-Stop no disponible
- Sistema Start-Stop: ¡Anomalía! Función no disponible
- Start-Stop no funciona SEAT
- Start-Stop system deactivated. Start the engine manually
- Start-Stop system fault
- Start-Stop system unavailable
- Start-Stop system: Fault! Function not available
- testigo Start-Stop tachado SEAT
What it means
In the SEAT Ateca owner's manual (MY21, edition 11/20), the Start-Stop unavailable lamp means the system is not available or has been switched off. The message 'Start-Stop system: Fault! Function not available' means there is a fault in the system and you should take the car to a workshop. SEAT also lists normal situations in which the engine does not switch off, such as an engine not yet warm, a very low battery or climate control not at temperature. Other models may differ. The message alone does not prove that a part is faulty.
Warnings and stop conditions
- Mediumsource verified
When Start-Stop stops the engine, the ignition stays on: switch the ignition off before leaving or the battery will drain. Never stop the engine before the car has come to a complete stop.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
- Mediumsource verified
If you tow with a towbar not fitted by SEAT, always switch Start-Stop off manually; otherwise the brake system may fail.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
Symptoms and causes
Probable causes · in order
- Start-Stop system faultCommon
With the fault message, SEAT states there is a fault in the Start-Stop system and that a workshop should repair it.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
- Very low batteryPossible
SEAT lists a very low battery as a reason the engine does not switch off, and a battery that is too low as a reason it restarts by itself.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
- Operating conditions not metPossible
Engine below operating temperature, door or bonnet open, belt unfastened, a steep slope or climate control not at temperature all prevent the stop.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
- System switched off with the buttonPossible
The system can be switched off manually with the centre console button; the unavailable lamp then lights up as well.
Evidence: SEAT Ateca owner's manual MY21 edition 11/20 (EN)
Virtual technician
Does Start-Stop system fault still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
SEAT Ateca owner's manual MY21 edition 11/20 (EN)
SEAT S.A. · 2020 · manual
- 2
SEAT Ateca manual de instrucciones MY21 edición 11/20 (ES)
SEAT S.A. · 2020 · manual
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