P0513 on 2018-2019 Fiat Spider: Invalid Key and No-Start Fixes

What's Unique About the 2018-2019 Fiat SPIDER

The 2018-2019 Fiat Spider uses Fiat's proprietary 1.4L MultiAir engine and electronic systems, including the Sentry Key Immobilizer System (SKIM), on a platform shared with the ND Mazda MX-5. A known issue, documented in a Fiat Technical Service Bulletin (TSB), points to this code appearing after a PCM software flash or replacement. This suggests that key reprogramming is a critical and sometimes overlooked step during certain service procedures for this specific model. The electronics are largely Fiat-specific, so solutions for the Mazda platform mate may not apply.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Engine cranks but will not start.
• Engine starts and then immediately stalls (within 2-3 seconds).
• Flashing security indicator light on the dashboard (often shaped like a key or lock).
• A "key invalid" message may appear on the instrum 🎬 See this video for a breakdown of P0513 causes and fixes.ent panel.
• Complete no-crank condition after multiple failed start attempts.

Most Likely Causes

1. Dead or Weak Key Fob Battery 🔴 High Probability Key fobs have a finite battery life (typically a CR2025 coin cell), and a weak battery may not have enough power to transmit the transponder signal to the car's immobilizer antenna.
   How to confirm: Try starting the vehicle with your spare key. If the spare key works, the issue is with the primary key, most likely its battery. You can also try holding the 'dead' key fob directly against the push-to-start button, which can sometimes allow the car to read the chip via induction even with a dead battery. Replacing the battery is an inexpensive test.
   Typical fix: Replace the battery inside the key fob (CR2025).
   Est. part cost: $2-$10
2. Key Programming Issue / Module Desynchronization 🟡 Medium Probability As per TSB #S2208000073, this is a known issue after a PCM is replaced or its software is updated ('flashed'). This can also occur after the main vehicle battery is disconnected or replaced, causing the PCM, Body Control Module (BCM), and RF Hub (which contains the SKIM) to lose synchronization.
   How to confirm: This is confirmed if the P0513 code appears immediately after a PCM replacement, software update, or main battery change. A dealer-level scan tool is needed to verify the desynchronization between modules.
   Typical fix: A "Proxy Configuration Alignment" must be 🎬 Watch: How to perform a Proxy Alignment using specialized software. performed using a dealer scan tool to resynchronize all modules. All existing keys must then be reprogrammed to the vehicle's immobilizer system.
   Est. part cost: $0 (if part of another repair), $100-$250 (for diagnostic and programming service)
3. Faulty Key Fob ⚪ Low Probability The internal transponder chip in the key can be damaged from being dropped, exposure to water, or electronic failure.
   How to confirm: If replacing the battery and trying the spare key doesn't work, the key itself may be the problem. A locksmith or dealer can test the transponder signal.
   Typical fix: Replace the key fob and have the new key programmed to the vehicle.
   Est. part cost: $150-$400
4. Faulty Immobilizer Antenna/Module (SKIM/RF Hub) ⚪ Low Probability The antenna ring around the ignition switch (or the RF Hub module itself) can fail, preventing it from reading the key's signal. This can be due to internal failure or wiring issues.
   How to confirm: A mechanic would use a specialized scan tool to check for communication between the key, antenna, and SKIM/RF Hub. They would also inspect the wiring and connectors for damage.
   Typical fix: Replace the faulty antenna ring or the Radio Frequency Hub (RFH) and program it to the vehicle.
   Est. part cost: $100-$300

Rare But Worth Checking

• Corroded Connectors:

Diagnosis Steps

1. Try starting the car with a spare key. If it starts, the problem is with your primary key.
2. If using the primary key, replace its internal battery (CR2025). This is the most common and cheapest fix.
3. If the key fob battery is dead, try holding the fob directly against the start/stop button while pressing it to start the car. This may allow the system to read the passive transponder chip.
4. Check for a flashing security light on the dashboard. This confirms the immobilizer system is active and causing the no-start.
5. Scan the vehicle with an advanced OBD-II scanner capable of reading manufacturer-specific codes to confirm P0513 is the primary code. Basic readers may not show this code.
6. If the vehicle recently had its PCM replaced, software updated, or the main battery disconnected, the modules must be resynchronized and keys reprogrammed by a dealer or qualified locksmith with the appropriate tools.
7. If keys are not the issue, have a professional inspect the immobilizer antenna ring (around the ignition) and the Radio Frequency Hub (RFH) for faults and proper wiring.

Parts You'll Likely Need

• Key Fob Battery (OEM #CR2025) — The key's transmitter requires power to send its code to the car. A dead battery is a very common cause for this code.
  Trusted brands: Energizer, Duracell, Panasonic
  OEM price range: $5-$10
  Aftermarket price range: $2-$5
• Key Fob / Transponder Key (OEM #WAZSKE13D02 (FCC ID), also seen as SKE13D-01) — If the internal transponder chip is damaged, the key is useless and must be replaced and reprogrammed.
  Trusted brands: OEM Fiat
  OEM price range: $200-$400
  Aftermarket price range: $100-$250

Technical Service Bulletins (TSBs) & Recalls

• S2208000073: No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting

Platform-Specific Known Issues

• A Technical Service Bulletin (S2208000073) exists for the 2018 model year specifically mentioning that DTC P0513 can be set after a PCM software flash or replacement, leading to a no-start condition. The fix requires a 'Proxy Configuration Alignment' with a dealer tool.
• Some owners in forums have reported this code appearing after the main vehicle battery dies and is replaced, suggesting the voltage drop can cause a loss of synchronization between the security modules.

Mechanic-Grade Diagnostic Values

• Immobilizer Antenna Ring Signal Strength — expected: Normal: -30dBm to -50dBm. Failure: A weak signal is below -60dBm; no signal indicates a broken antenna or wiring issue.
• Voltage at RF Hub Module Fused B(+) Circuit — expected: Battery Voltage (approx. 12.6V with ignition off). Failure: No voltage indicates an open or short in the power supply circuit to the RF Hub.
• Continuity at RF Hub Module Ground Circuit — expected: Good continuity to chassis ground (low resistance).. Failure: A test light connected to a 12V source does not illuminate when probing the ground pin, indicating an open ground circuit.

Hidden / Shadow Codes Worth Checking

• 0x11 (Negative Response): This is not a DTC, but a status code returned by the RF Hub module during a key programming procedure, indicating that the procedure failed. (see via Visible on the Fiat dealer scan tool (wiTECH 2.0) screen when performing the 'Add Key' or 'PCM RFH Replace' function.)

Scan Tool Commands That Help

• wiTECH 2.0: Proxy Configuration Alignment — This is the primary function required after a module (PCM, BCM, RFH) is replaced or reflashed to synchronize all modules on the CAN bus. It is required to clear P0513 if it was set due to module desynchronization.
• wiTECH 2.0: PCM/ECM/ESL replace — This routine, found under the BCM 'Misc. Functions' menu, must be run specifically when the PCM has been replaced. It transfers the immobilizer data and security handshake information to the new PCM.
• wiTECH 2.0: Add Key — Located under 'RFH miscellaneous functions', this is used to program new or additional keys to the vehicle. It requires the vehicle's PIN code.
• wiTECH 2.0: PCM RFH replace — This function, under 'PCM miscellaneous functions', is a secondary procedure to try if the standard 'Add Key' function fails with a negative response (0x11).

Wiring & Ground Locations

• RF Hub Module Connector — The Radio Frequency Hub (RFH) is the central module for the immobilizer. While its exact location on the Spider isn't definitively shown, on similar FCA platforms it is often located behind the rear seats or under the dashboard/center console.. This connector is the central point for testing power, ground, and CAN bus communication to the immobilizer system. A poor connection here will cause a P0513.
• RF Hub Power and Ground Pins — On the RF Hub module's main connector, there will be dedicated pins for Battery (+), Ground, CAN C High, and CAN C Low. For example, on a generic FCA RF Hub: Pin 8 is +BAT, Pin 6 is GND, Pin 12 is CAN Hi, and Pin 11 is CAN Lo.. Technicians can probe these specific pins to verify the module is receiving power and has a solid ground, which are prerequisites for it to function and communicate.
• Immobilizer Antenna — This is a coil antenna located as a ring around the push-to-start button.. This antenna reads the transponder chip in the key fob. Damage to its wiring or an internal failure will prevent the key signal from being received, directly causing P0513.