OBD-II trouble code
P0513: Incorrect Immobilizer Key
The vehicle's anti-theft (immobilizer) system did not recognize the key's electronic code. The PCM rejects the key's transponder signature, and as an anti-theft measure it can prevent the engine from starting or running.
Quick facts
- System
- Powertrain
- Category
- Vehicle Theft Deterrent
- Severity
- Medium severity
- Drivable
- No — stop driving until repaired
- Repair cost range
- $60 – $500
- DIY difficulty
- Intermediate DIY
What does P0513 mean?
Modern keys contain a transponder chip that exchanges a coded signal with the vehicle's immobilizer system. When you try to start the car, the immobilizer reads the key and checks its electronic signature against the values stored in the vehicle. P0513 sets when that check fails — the powertrain control module (PCM) considers the key incorrect or unrecognized. Because the immobilizer's job is to stop a car from being driven away without a valid key, a failed match can disable fuel and ignition, so this code is frequently associated with a no-start or a car that starts and immediately stalls.
Common causes include using a key that was never programmed to the vehicle (a spare, aftermarket, or replacement key), a weak or failed transponder chip, a faulty or misaligned immobilizer antenna ring around the ignition, wiring or connector problems, and low system voltage that disrupts the authentication handshake. Interference from other keys or transponder devices on the same ring can also cause it. Diagnosis focuses on confirming the key is properly programmed to the car, checking the antenna ring and its wiring, and verifying good battery voltage, since a weak battery can cause intermittent authentication failures.
Common causes
- Unprogrammed, aftermarket, or replacement key not matched to the vehicle
- Weak, damaged, or failed transponder chip in the key
- Faulty or misaligned immobilizer antenna ring at the ignition
- Wiring or connector problem in the immobilizer circuit
- Low battery/system voltage disrupting the authentication handshake
- Interference from other keys or transponders near the ignition
- Immobilizer or PCM programming/configuration fault
Symptoms
- Engine won't start, or starts and immediately stalls
- Security/immobilizer or key warning light on or flashing
- Intermittent no-start that comes and goes
- Check engine light with P0513 stored
- A newly cut or aftermarket key that won't start the car
Diagnostic steps
- 1.Try a known-good, properly programmed key to see if the no-start follows the key.
- 2.Confirm the key in use was actually programmed to this vehicle (spares and aftermarket keys often are not).
- 3.Load-test the battery and verify system voltage — low voltage can cause intermittent authentication failures.
- 4.Inspect the immobilizer antenna ring around the ignition and its wiring/connector.
- 5.Move away extra keys or transponders that might interfere on the ring.
- 6.Use a capable scan tool to read immobilizer data and, if needed, reprogram the key to the vehicle following the correct security procedure.
Repair cost
$60 – $500
Programming or cutting and programming a correct key is often $60-$300 depending on the vehicle and key type. Antenna-ring or wiring repairs vary. High-security or dealer-only key systems can cost more. Confirm the key is the issue before replacing immobilizer hardware.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with immobilizer key / anti-theft service preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.