P0513: Invalid Immobilizer Key
The immobiliser did not recognise the key.
Normal risk
Not a driving risk, but the engine may not start.
Short answer · Can I keep driving with P0513?
If the car runs, yes. But it may not restart. Try the spare key and, on keyless cars, replace the key battery.
What does P0513 mean?
Code P0513 means the immobiliser did not recognise the key. Without a valid key, the engine control unit blocks starting or stops the engine shortly after start.
Often the key battery is weak (keyless systems), the transponder is damaged or the wrong key is used. Some cars also set it after a key was programmed incorrectly.
What the car does when the code is set
The immobiliser or key warning light comes on. Depending on the car, the engine will not crank, will crank but not start, or will start and stop again after a second or two.
How the system works
The immobiliser stops the engine from running without an authorised key. A chip (transponder) in the key exchanges a coded message with an antenna around the ignition switch or, on keyless cars, with antennas in the cabin. If the code is correct, the immobiliser tells the engine control unit that starting is allowed. If not, the engine control unit blocks the injection and ignition, or lets the engine start and then stops it after a second or two.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Key not recognisedThe transponder chip in the key is damaged or not programmed.
- Weak key batteryOn keyless systems a weak battery can stop the key being detected.
- Faulty antenna ring around the ignitionThe reader coil does not pick up the transponder.
- Control unit communication faultThe immobiliser and engine control unit do not exchange the code.
How it is diagnosed
- Try the spare keyIf the spare key works, the first key is the problem.
- Replace the key batteryOn keyless cars, hold the key against the start button or the place shown in the manual.
- Read the immobiliser codesA scan tool with immobiliser access shows whether the key is recognised.
- Programming at the dealer or a locksmithNew keys or modules must be programmed with the right equipment and security codes.
Questions about P0513
Can I bypass the immobiliser?
No. Bypassing it removes theft protection and may void your insurance. A dealer or automotive locksmith can program keys.
Why does the engine start and then stop?
On many cars the engine starts briefly, then the immobiliser blocks fuel and ignition when it does not recognise the key.
Can a phone or other key near the key cause this?
Strong interference or a second transponder on the key ring can disturb reading. Try with the key alone.