1. Start with your location and the immediate situation
Keep the vehicle secure and follow any warning or breakdown instructions in its handbook. If there is smoke, a strong fuel smell or another immediate hazard, stop attempts to start it and arrange appropriate help.
Tell us whether you are at home, in a car park or beside a road. Include your postcode, the exact parking position and any access restrictions. Do not move the vehicle simply to test a theory about the fault.
2. Describe the response, not a suspected component
Think back to the normal starting attempt you have already made. There is no need to keep trying to reproduce the problem. A key that will not rotate is a different observation from an engine that turns over but does not run.
Do not apply a simple rule such as “the lights are bright, so the battery is fine” or “it clicks, so it needs a starter”. Observations help direct testing; they do not establish the repair.
- Does the key insert, turn and come out normally?
- Does the dashboard respond?
- Is there silence, clicking or the usual engine-turning sound?
- Does the engine start briefly and then stop?
- For an electric or hybrid vehicle, does the normal ready-to-drive indication appear?
3. Record warnings and useful history
Photograph the exact message while safely parked. Note whether remote locking works and whether an available, previously working spare behaves differently. Do not assume that a different result proves a particular key component has failed.
Manufacturer messages are specific to the vehicle. Volvo’s S60 handbook, for example, distinguishes key-reading messages from a persistent immobiliser error that needs workshop attention. Use your own model’s guidance rather than a reset sequence for another car.
- When did the vehicle last start normally?
- Was any key, battery, ignition or module work carried out recently?
- Is the problem constant or intermittent?
- Are there existing diagnostic reports or fault-code records?
4. Agree the assessment before ordering parts
Send the registration, model, year, location and your observations. We can discuss whether key, ignition, immobiliser, electrical or mechanical assessment is appropriate and confirm availability for the vehicle.
Ask what the initial visit includes and how further tests or repairs will be agreed. A fault code is a starting point for investigation, not an automatic instruction to buy the part named in its description. Keep any previous reports so useful evidence is available.
Common questions
Does a car that turns over but will not start need key programming?
Not necessarily. Describe the warnings and behaviour so the relevant systems can be assessed before a programming or repair decision is made.
Should I keep trying to start it before calling?
Repeated attempts are not needed for the enquiry. Record what already happened, follow the vehicle handbook and stop if an attempt produces an unusual smell, smoke or another warning sign.
Sources and further reading
These sources support the general guidance. For vehicle operating instructions, use the handbook for your exact model and year.