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Summary
  • DTC P0513 stands for “Incorrect Immobilizer Key,” and this code is logged when the PCM can’t recognize the immobilizer key inserted in the cylinder.
  • Code P0513 is commonly caused by PCM programming errors, bad ignition cylinders, and faulty key transponders.
  • Symptoms of code P0513 include a lit check engine light, activated security lights in the instrument panel, and a no-start condition.

What Does the P0513 Code Mean?

Diagnostic trouble code (DTC) P0513 stands for “Incorrect Immobilizer Key.”

The immobilizer system works using radio frequency identification (RFID). The transponder or smart key has a microchip, which enables it to connect to the powertrain control module (PCM). Inserting the key into the key cylinder will instantly trigger the immobilizer system to operate.

P0513 is logged when the PCM can’t recognize the immobilizer key inserted in the cylinder.

smart key of a white car
The transponder or smart key has a microchip, which enables it to connect to the powertrain control module (PCM).

The PCM usually searches for a cryptographic signature from the key fob. The vehicle will only start (activate fuel injection and ignition sequences) if the key fob is valid. If it’s not, the PCM will trigger the P0513 code. Some systems will start and die, and you’ll notice a flashing immobilizer light.

Note that P0513 is related to passive anti-theft. You can learn more about it in our discussion about immobilizer systems.

Note: The definition of code P0513 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0513 Code?

  • Malfunctioning microprocessor key or key fob
  • PCM programming error
  • Bad ignition cylinder
  • Faulty key transponder (separate from the cylinder on some vehicles)

What are the Common Symptoms of the P0513 Code?

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How to Diagnose the P0513 Code

Many vehicles can log code P0513. However, that doesn’t mean that there’s a fixed diagnostic procedure that’ll work for all cars.

You’ll need to know the intricacies of your ride’s anti-theft system to diagnose this problem. So if you’re not familiar with immobilizer keys, microprocessors, and the like, it’s best to leave the job to a trusted mechanic.

But if you’re an experienced DIYer, you can diagnose this trouble code yourself. Here is a video you might want to check out before you start.

How to Fix the P0513 Code

The P0513 code can be tricky to resolve. We recommend taking your ride to an auto repair shop if you don’t have the expertise to diagnose and fix this error code.

But if you’re a DIYer who’s up for the challenge, you can go ahead and fix the issue. Before starting, make sure you read up on the code and determine how to resolve it. Get vehicle-specific repair guides from resources like Chilton or an ALLDATA subscription.

Immobilizer Systems Using Chipped Keys

Most cars nowadays have some kind of anti-theft system.

There are active anti-theft and passive anti-theft systems. Active or perimeter anti-theft, as it is sometimes called, is activated when you lock your car doors and will sound an alarm if the system isn’t disarmed with the key or a fob before opening the door.

Active or perimeter anti-theft, as it is sometimes called, is activated when you lock your car doors and will sound an alarm if the system isn’t disarmed with the key or a fob before opening the door.

– Richard McCuistian, ASE Certified Master Automobile Technician

If somebody breaks a window, it won’t sound (aftermarket systems will), but if they open the door after breaking the window or use tools to unlock and open the door, the perimeter anti-theft will usually honk the horn and flash the lights. This system’s purpose is to keep thieves from stealing items you left in your car.

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Passive anti-theft systems (also referred to as “immobilizer”) are automatic and cannot be disabled by the driver. Anybody who doesn’t have a key that the passive anti-theft system recognizes won’t be able to start the engine even if they have a key that fits the ignition.

Most vehicles today don’t have actual key lock cylinders. Instead, they’re push button start and require the driver to have a recognized key fob within the vehicle before the engine can be started. In other words, passive anti-theft makes it more difficult to steal the car.

chipped immobilizer key with a transponder
Chipped immobilizer key with a transponder for a passive anti-theft system | Image Source: Richard McCuistian.

Passive anti-theft that used a chipped (immobilizer) key with a transponder first showed up in 1996. In 1993, it appeared in Europe and greatly reduced vehicle theft.

This kind of immobilizer system has an antenna coil surrounding the lock cylinder where the key is inserted. When the key is switched on, the transponder chip is activated by radio frequency and a number is broadcast through the antenna to the module, which is the “brains” of the system. In early VWs, this was in the instrument cluster. On other makes, it could be in the PCM, the instrument cluster, a stand alone module, a smart junction box, or somewhere else.

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The module that receives and interprets the coded key transmission can store multiple keys, and usually a minimum of 2 keys are required. Your vehicle might log the P0513 code if there’s something wrong with its immobilizer key.

Where to Get a New Key Fob for Your Vehicle

If a malfunctioning key fob is triggering DTC P0513 and immobilizing your vehicle, it’s time to buy a replacement. After all, you don’t want to be stuck somewhere because your vehicle doesn’t recognise your key fob. Thankfully, you can purchase a new key fob from CarParts.com.

Not sure what to do first? Don’t worry. CarParts.com has a dedicated support team ready to help you find and purchase the right parts for your vehicle. They’re happy to tell you all about our current budget-saving offers and customer-centered guarantees. If you need help navigating our website or learning more about our available products, they’re a quick call or chat away. Reach out if you have any questions. Our team is on call around the clock and always ready to assist.

Don’t stay locked out of your vehicle. Purchase a replacement key fob from CarParts.com as soon as possible.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

File Under : OBD-II Trouble Codes Tagged With :
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