May not start until a valid key is recognised. P0513 means the engine controller received a transponder key ID that it does not recognise as one of the vehicle's programmed keys, so the immobiliser has refused to authorise fuel and spark. It usually points to an unprogrammed, aftermarket, or damaged key, a weak transponder, or a fault in the antenna ring or immobiliser module rather than an engine problem.
What P0513 means
P0513 is an anti-theft (immobiliser) fault, not a mechanical engine fault. Every valid key contains a small passive RFID transponder chip. When the key is turned to the run or crank position, an antenna coil (the ring around the ignition lock cylinder, or the smart-key antenna on push-button systems) energises that chip, which transmits its unique ID back to the immobiliser module. On Chrysler and Jeep vehicles this module is the SKIM/SKREEM or Wireless Control Module (WCM); on Toyota it is the transponder key ECU or a smart-key ECU. The module checks the received ID against the list of keys it has stored during programming, and if they match it sends an encrypted authorisation message to the ECM/PCM over the data bus to release fuel and spark. When the module receives an ID that is not on its valid list, it logs P0513 and withholds that authorisation. The practical result is a no-start or a start-then-stall: the starter may crank normally, but the engine will not fire, or on some systems it catches for one to two seconds and then dies as the controller cuts fuel. A theft or key-shaped warning light usually flashes to confirm the immobiliser is active.
Symptoms
- Engine cranks normally but will not start, with no fuel or spark being delivered
- Engine fires briefly then stalls within a second or two as the immobiliser cuts fuel
- Security, theft, or key-shaped warning light flashing or lit on the instrument cluster
- A 'key not recognised' or immobiliser-active message on the driver information display
- One key works while a spare, replacement, or copied key does not
Common causes
- A key that was never programmed to this vehicle, or a wrong or aftermarket key with an incompatible transponder (most common)
- A weak, damaged, or failing transponder chip inside an otherwise valid key
- A faulty or misaligned antenna ring around the ignition lock cylinder (or a weak smart-key antenna) that cannot read the chip reliably
- A failed or corrupted immobiliser module (SKIM/SKREEM/WCM on Chrysler-Jeep, transponder/smart-key ECU on Toyota), or lost key programming data
- Wiring or connector faults, or bus communication problems, between the antenna, immobiliser module, and the ECM/PCM
Severity & driving advice
Severity: Moderate — No mechanical damage, but the immobiliser blocks starting, so the vehicle can be stranded until a valid key or module fault is sorted.
Can I drive? May not start until a valid key is recognised
Diagnostic approach
- Try a known-good original key — Start with the cheapest test. If the vehicle came with more than one key, try each original key in turn. If one starts the engine and another does not, the fault is almost certainly in the non-working key's transponder or its programming, not in the vehicle. Keep the working key clear of other transponder keys on the ring, which can interfere with the read.
- Scan the immobiliser module and read live key data — Use a scan tool that can access the immobiliser or theft module, not just generic powertrain codes. Read how many keys the module has programmed and whether it reports a valid transponder when the key is turned. Note any companion codes such as transponder-not-received or antenna faults, and check that the immobiliser and ECM/PCM are communicating over the bus.
- Check the antenna ring and its wiring — If no key is read at all, inspect the antenna coil around the ignition lock cylinder for damage, corrosion, or a disconnected connector. Confirm the antenna has power and ground and that its harness to the immobiliser module is intact. A cracked or displaced ring, or a chafed lead, will stop the module from ever seeing the transponder ID.
- Verify or re-program the key to the vehicle — If the key hardware and antenna are good but the ID is still rejected, re-program the key to the immobiliser using the correct dealer-level procedure. Many Chrysler, Jeep, and Toyota systems require a PIN or seed code tied to the VIN and a capable tool. Program a genuine transponder of the correct type; a blank or mismatched chip will keep setting P0513.
- Test the immobiliser module and bus, then confirm the fix — If a verified good key still will not authorise, suspect the immobiliser module itself or its link to the ECM/PCM. Confirm supply, ground, and bus messages at the module before condemning it, since a replacement usually needs VIN and key programming. After any repair, clear the code, cycle the ignition, and confirm the engine starts and stays running with the security light off.
Make & model notes
Chrysler: On Chrysler and Jeep vehicles the immobiliser is the SKIM/SKREEM or Wireless Control Module (WCM). P0513 typically follows a new or uncoded key, a lost PIN, or a WCM fault. Programming a Sentry Key needs the VIN-linked PIN and a capable tool; a genuine FOBIK or transponder of the correct part number is required, and a replacement WCM must be coded to the vehicle and its keys.
Toyota: On Toyota and Lexus the transponder key ECU or smart-key ECU handles immobiliser authorisation. P0513 shows up after an unregistered key, a weak chip, or antenna problems, and often with a flashing security light. Key registration and any ECU replacement generally require Techstream and the correct key data, and after an ECM swap the immobiliser key data must be re-registered before the engine will start.
FAQ
Can I fix P0513 with a locksmith key instead of going to the dealer?
Often yes. A qualified automotive locksmith with the right equipment can cut and program a compatible transponder key for many Chrysler, Jeep, and Toyota vehicles, sometimes cheaper than a dealer. The key must contain the correct transponder type and be programmed to the vehicle's immobiliser. A blank or generic key that is not registered will simply keep setting P0513.
Why does the engine start for a second and then die?
That start-then-stall behaviour is the immobiliser doing its job. The controller lets the engine fire briefly while it waits for a valid key authorisation, and when the key ID is not recognised it cuts fuel and shuts the engine down. It is a strong sign the fault is in the key, transponder, or immobiliser communication rather than in the fuel or ignition system itself.
Could a dead key-fob battery cause P0513?
Not usually on a traditional turn-key system, because the transponder chip is passive and is powered by the antenna ring, not the fob battery. On push-button smart-key systems a very weak fob can make reads unreliable, and most of those vehicles include a backup way to hold the fob against a marked spot to start. If a fresh fob battery or the backup method works, focus on the fob and antenna.
Is it safe to drive with P0513?
There is no mechanical risk from the code itself, so nothing is being damaged. The real problem is that the immobiliser may prevent the engine from starting at all, which can leave you stranded. If it currently starts with a particular key, treat the situation as urgent and get a valid, properly programmed key or the underlying module fault sorted before you rely on the vehicle.