P0513

What it means

P0513 is the generic SAE J2012 code for an incorrect immobiliser key. The engine control unit, or the immobiliser module it communicates with, did not accept the key or transponder code presented during the start sequence. The authentication between key, immobiliser and engine control unit failed, so the engine may be prevented from starting or running.

Symptoms

• Engine cranks but will not start, or starts and stalls after a second or two
• Engine will not crank at all on some vehicles
• Immobiliser or security warning light flashing or staying on
• Key not recognised message on the dashboard
• Intermittent starting problems that vary between keys
• Engine management light on with the code stored

Possible causes

• Key transponder not recognised because the key is not programmed to the vehicle, or is a non-matching or poorly cut copylikely
• Flat or failing transponder battery in the key fob, or a damaged transponder chip in the key (for example after being dropped)likely
• Faulty or poorly connected immobiliser antenna (coil reader) around the ignition barrel or start buttonpossible
• Wiring or connector fault, or a communication problem between the immobiliser module, body control module and engine control unitpossible
• Low battery voltage or poor earths causing communication dropouts during startingpossible
• Engine control unit or immobiliser module not correctly matched after replacement or software workpossible
• Internal fault in the immobiliser module or engine control unitrare

How to diagnose

1. Record the code, freeze frame data and any other stored codes in the engine, body and immobiliser modules, and note whether the security light behaves abnormally
2. Try every available key, and keep other keys and fobs away from the ignition area to rule out interference between transponders
3. Check the key for damage and the fob battery condition, and replace the battery if the vehicle type allows
4. Test the battery condition and charging voltage, then inspect the main earths and power supplies to the engine and body modules
5. Inspect the immobiliser antenna ring or reader, its wiring and connectors for damage, corrosion or looseness
6. Check the communication network and the relevant module wiring for faults, and confirm the modules respond to a scan tool
7. Check the vehicle history for recent module replacement, repairs or reprogramming that could cause a mismatch
8. Use manufacturer procedures to check key learning status and module matching, as this differs between makes and models

How to fix

• Replace the fob battery or a damaged key, then have the key properly programmed to the vehicle
• Repair or replace a faulty immobiliser antenna or reader
• Repair damaged wiring, connectors or earths in the immobiliser and communication circuits
• Charge or replace a weak battery and correct any voltage supply problems
• Re-learn or match the keys, immobiliser and engine control unit using the manufacturer's procedure
• Replace and correctly code the faulty immobiliser module or engine control unit if testing confirms an internal fault

Can I keep driving?

Nearby codes

• P0512GenericStarter Request Circuit
• P0514GenericBattery Temperature Sensor Circuit Range/Performance