OBD-II Code P0513 — What It Means & How to Fix It

What Does This Error Mean?

P0513 means the vehicle's immobilizer system does not recognize the key being used to start the car. SKIM stands for Sentry Key Immobilizer Module — a Chrysler/Dodge/Jeep term — but P0513 applies broadly to any vehicle with a key transponder system. The transponder chip inside your key transmits a unique code to the vehicle when you try to start it. If the code does not match what the security module expects, the engine is prevented from starting.

Affected Models

Most vehicles 2000 and newer with transponder key or smart key ignition systems
Very common on Chrysler, Dodge, Jeep, and Ram vehicles with the SKIM system
Common on Ford vehicles with PATS (Passive Anti-Theft System)
GM vehicles with PassLock, Pass-Key, or StabiliTrak security systems
Toyota, Honda, Nissan, and Hyundai models with engine immobilizer systems

Common Causes

Key transponder chip has failed or the chip has been damaged by physical impact or water
Using a key that was never programmed to the vehicle — an unprogrammed spare key looks identical but has no transponder code
Sentry Key Immobilizer Module (SKIM) or equivalent security module has failed
Wiring or antenna ring around the ignition cylinder has failed, preventing transponder communication
The key was reprogrammed or cloned improperly and the code does not match the module

How to Fix It

Try using a different key for the vehicle if you have a spare. If the spare key starts the car without setting P0513, the original key's transponder has failed. A new key will need to be programmed to the vehicle.

Spare keys that were cut at a hardware store without transponder programming will not work in immobilizer-equipped vehicles — they will physically turn the lock but the engine will not start.
Inspect the key for physical damage. A key that has been dropped, submerged in water, or exposed to strong magnets may have a damaged transponder chip. Hold the key close to the ignition cylinder when turning — sometimes a damaged chip only works at very close range.

The transponder chip is inside the plastic head of the key — it does not need a battery. Physical damage to the chip permanently destroys it.
Check the antenna ring around the ignition cylinder. It is a thin ring of wire that reads the key transponder. Make sure it is not loose, broken, or disconnected. An improperly seated antenna ring prevents transponder communication even with a good key.

The antenna ring connector is usually located on the steering column under the plastic shroud.
If a spare key works and the original is confirmed dead, have a new transponder key programmed at a dealer or by an automotive locksmith. Bring both working keys, vehicle title, and ID — security programming requires proof of ownership.

Many vehicles require at least two working keys present during the programming procedure. If you only have one key left, inform the dealer before the appointment.
If no key works and the antenna ring is intact, the SKIM or security module may have failed. This requires dealer diagnosis and a potentially expensive module replacement with programming.

A failed security module is less common than a failed key — always exhaust key-related causes before pursuing module replacement.

When to Call a Professional

Key programming typically requires dealer-level equipment or a professional automotive locksmith with the correct programming tool. A new transponder key from a dealer can cost $80 to $400 depending on the vehicle. If the SKIM module itself has failed, replacement and programming adds additional cost.

Frequently Asked Questions

Can I program a new key myself?

On some older vehicles (early 2000s GM models, for example), you can program a key yourself using a specific sequence of on/off ignition cycles. On most modern vehicles, dealer-level or professional locksmith programming equipment is required. Check online for the specific self-programming procedure for your year, make, and model — many guides are available.

Will P0513 prevent my car from starting?

Yes — that is the entire purpose of the immobilizer system. If the PCM does not receive a valid transponder code from the key, it will prevent fuel injection or ignition from activating. The engine may crank normally but will not fire.

How much does a new programmed key cost?

Costs vary widely. A basic transponder key from a dealer typically runs $80 to $200. Proximity/smart keys (push-button start vehicles) are much more expensive — often $200 to $500 or more. Automotive locksmiths are often significantly cheaper than dealers for key programming.