P0513 on 2018-2022 Ram ProMaster: Invalid Immobilizer Key Causes and Fixes

What's Unique About the 2018-2022 Ram PROMASTER

The Ram ProMaster's security system is particularly sensitive to module programming. A specific Technical Service Bulletin (TSB) highlights that this code commonly appears after the PCM has been replaced or its software has been updated (flashed). If the proper key and module relearn procedure isn't performed immediately after, the modules will be out of sync, triggering the P0513 code and a no-start condition even with a perfectly good key.

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 immediately stalls (runs for ~2 seconds)
• Engine does not crank at all
• Red security light (often a dot or key symbol) is solid or flashing on the instrument cluster
• Check Engine Light is on
• Remote key fob functions (lock/unlock) may not work intermittently or at all

Most Likely Causes

1. PCM Replacement or Software Flash Without Key Relearn 🔴 High Probability A known issue documented in Ram TSB #S2208000073. The PCM defaults and loses the security code handshake information after being replaced or reflashed.
   How to confirm: Confirm if the PCM was recently replaced or updated. A professional scan tool is needed to run the 'PCM/ECM/ESL replace' routine to re-establish the security handshake.
   Typical fix: Using a dealer-level scan tool (like wiTECH), a technician must perform the 'PCM replaced' procedure. This involves running the “PCM/ECM/ESL replace” routine found in the BCM's “Misc. Functions” menu, followed by a “Proxy Configuration Alignment” to sync the PCM, BCM, and RF Hub.
   Est. part cost: $0 (if only programming is needed)
2. Defective or Unprogrammed Key Fob 🟡 Medium Probability Key fobs can be damaged by drops or water, and internal transponder chips can fail. Aftermarket keys may not program correctly. Sometimes, the vehicle can randomly lose its key programming.
   How to confirm: Try starting the vehicle with a spare, known-good key. If the spare key works, the original key is the problem. A weak or dead battery in the fob can also be a cause, though the transponder chip itself is often passive.
   Typical fix: Replace the battery in the key fob. If that fails, the key must be replaced and programmed to the vehicle by a dealer or automotive locksmith. In some cases, simply reprogramming the existing keys may solve the problem temporarily.
   Est. part cost: $5-$15 for a battery, $150-$500 for a new key and programming, depending on key type and service provider.
3. Faulty Wireless Control Module (WCM) / RF Hub ⚪ Low Probability The antenna ring around the ignition switch or the RF Hub module itself can fail, preventing the key's transponder signal from being read. This can be an intermittent failure at first. Complete failure will result in a hard no-start and may even trigger the vehicle alarm.
   How to confirm: A professional scan tool can check for communication with the WCM/RF Hub. A technician can also test the resistance and continuity of the antenna circuit. If keys are good and the PCM relearn procedure fails, the RF Hub is a likely suspect.
   Typical fix: Replace the WCM/RF Hub module and its associated antenna. This new module must be programmed to the vehicle and existing keys using a dealer-level scan tool.
   Est. part cost: $100-$250
4. Wiring Harness Issues ⚪ Low Probability ProMasters have seen issues with CAN bus wiring harnesses chafing or developing corrosion, leading to communication loss between modules. Corrosion on battery cables or fuse panel connections can also cause intermittent electrical issues that trigger this code.
   How to confirm: Visually inspect the wiring harnesses leading to the PCM, BCM, and steering column for damage or corrosion. A technician can perform continuity and resistance checks on the CAN bus network. Wiggling suspect wires while trying to start may reveal the issue.
   Typical fix: Repair the damaged section of the wiring harness or clean corroded connections.
   Est. part cost: $20-$100 for wiring repair supplies.

Rare But Worth Checking

• Low Vehicle Battery Voltage: A very weak or failing vehicle battery can cause communication glitches between modules during startup, sometimes incorrectly setting a P0513 code. The TSB specifically advises ensuring the BCM and PCM have good battery voltage before attempting programming.
• Aftermarket Remote Starter or Alarm: Improperly installed aftermarket security or remote start systems can interfere with the factory immobilizer communication, causing this code.

Diagnosis Steps

1. Check the dashboard for a flashing or solid red security light. This is a key indicator of an immobilizer issue.
2. Try your spare key. If it works, the problem is with your primary key fob.
3. Replace the battery in the non-working key fob as a simple, inexpensive first step.
4. If you have a capable OBD-II scanner, check for codes in the Body Control Module (BCM) and RF Hub/WCM, not just the PCM. Look for related codes like U0426-62 or B1A25.
5. If the issue occurred immediately after a PCM replacement or software update, the vehicle must be taken to a dealer or equipped shop to have the 'PCM replaced' procedure run as per TSB S2208000073.
6. If keys are not the issue, have a professional inspect the wiring and connectors for the RF Hub and antenna ring around the ignition cylinder for corrosion or damage.
7. As a final step, diagnosis will involve testing the RF Hub and PCM modules themselves, which requires advanced tools and knowledge. Intermittent failures may point towards a failing RF Hub.

Parts You'll Likely Need

• Transponder Key Fob — The transponder chip inside the key can fail, the key can be damaged, or the vehicle can lose its programming, making the key 'invalid' to the vehicle.
  Trusted brands: Mopar (OEM)
  OEM price range: $150-$300
  Aftermarket price range: $75-$150
• Wireless Control Module (WCM) / RF Hub (OEM #e.g., 68583952AA, 68525460AB (Verify with VIN)) — This module, including its antenna ring, is responsible for reading the key. If it fails, it cannot communicate the key's status to the PCM. Failure can be intermittent at first before becoming permanent.
  Trusted brands: Mopar (OEM)
  OEM price range: $170-$260
  Aftermarket price range: $80-$175

Related Codes That Often Appear With This One

• U0426-62 (MiniKrypt Error Signal Compare Error): This code is specifically mentioned in a revised version of TSB S2208000073 as a related DTC that can appear alongside P0513 after a module replacement.
• B1A25 (Invalid SKIM Key): This is a Body Control Module (BCM) or RF Hub code that often accompanies the PCM's P0513, indicating the security module itself has identified the key as invalid.

Technical Service Bulletins (TSBs) & Recalls

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

Platform-Specific Known Issues

• Per TSB S2208000073, a no-start condition with code P0513 is a known issue after replacing or reflashing the PCM. The fix involves using a wiTECH scan tool to run the "PCM/ECM/ESL replace" routine in the BCM's 'Misc. Functions' menu to re-sync the security codes between the PCM, BCM, and RF Hub. A 'Proxy Configuration Alignment' must also be performed.

Mechanic-Grade Diagnostic Values

• CAN C Bus (+) and (-) circuit resistance — expected: Below 5.0 Ohms. Failure: A reading above 5.0 Ohms indicates an open or high resistance in the circuit between the RF Hub and the CAN C Star Connector.
• RF Hub Module Fused B(+) Circuit Voltage — expected: Test light illuminates brightly when connected to ground.. Failure: Test light does not illuminate, indicating an open or short in the power supply circuit (A910).
• RF Hub Module Ground Circuit — expected: Test light illuminates brightly when connected to 12-volts.. Failure: Test light does not illuminate, indicating an open in the ground circuit (Z906).
• Passive Entry Antenna Circuit Resistance — expected: Below 2.0 Ohms. Failure: A reading above 2.0 Ohms indicates an open in the antenna signal circuit.
• Operating Battery Voltage for Diagnostics — expected: Between 10.0 and 16.0 Volts. Failure: Voltage outside this range can cause communication errors or prevent modules from being programmed correctly.

Hidden / Shadow Codes Worth Checking

• B1A25: Invalid SKIM Key. This code is set by the RF Hub or BCM when it determines the key's transponder signal is not valid. It directly corresponds to the P0513 code set in the PCM. (see via A professional scan tool (like wiTECH or Autel) capable of reading codes from the Body Control Module (BCM) or Radio Frequency Hub (RFH), not just the Powertrain Control Module (PCM).)

Scan Tool Commands That Help

• wiTECH (or equivalent dealer tool): Key Programming / Acquire More Keys — When adding a new key. The procedure requires a vehicle-specific PIN, activating hazard lights, and pressing the unlock button on the new fob within a set time to program it to the RF Hub.
• wiTECH (or equivalent dealer tool): Read RF Hub DTCs — To check for module-specific codes like B1A25 that won't appear in a standard PCM scan, providing a more precise diagnosis of the security system fault.
• AlfaOBD (with Security Gateway Bypass): RF Hub Diagnostics & Key Programming — This is an advanced aftermarket solution for diagnosing the RF Hub and programming new keys without a dealer visit. It requires a specific bypass cable for 2018+ models to communicate with the security module.

Wiring & Ground Locations

• Primary Engine/Transmission Ground Strap — A braided strap running from the transmission case to a bolt on the top of the transmission mount. It is best accessed by removing the driver's side headlight assembly.. A poor or intermittent ground here can cause widespread data corruption and communication errors between the engine, transmission, and security modules, potentially triggering a false P0513 code.
• RF Hub Module Connector C1 — The main connector at the Radio Frequency Hub module.. This connector contains the primary power (Circuit A910), ground (Circuit Z906), and CAN C Bus communication wires (Circuits D39 & D40) essential for the module's operation.
• IP CAN C Star Connector C8 — Located in the instrument panel, this is a junction point for the CAN C bus network.. This is a key test point for checking the continuity of the CAN bus wiring between the RF Hub and the rest of the vehicle's network.

Real Owner Repair Stories

• 5thGenRams Forum user 'FastBlackRam' (Newer Ram 1500 (similar security system)) — Key fobs would not unlock doors. Using the manual key set off the alarm. Battery tested good. After disconnecting the battery overnight, the truck started but ran for only 30 seconds before shutting off and the fobs became unresponsive again.
  ❌ Tried (didn't work) Testing the vehicle battery, Pushing the start/stop button with the key fob (this only works for a dead fob battery, not a failed module)
  ✅ What actually fixed it The vehicle was towed to the dealer, who diagnosed and replaced a failed Radio Frequency (RF) Hub. The failure was internal and not caused by water intrusion.
• YouTube user 'RPMgarage' (Ram ProMaster, unknown year) — No crank, no start condition. Turning the key only produced clicks, indicating the starter was not getting enough power or was being inhibited.
  ❌ Tried (didn't work) Assuming it was a simple starter or battery issue.
  ✅ What actually fixed it An additional ground cable was added, running from one of the starter mounting bolts directly to a solid ground point on the vehicle's frame. This provided a better ground path for the starter and engine, resolving the no-crank condition.

"I Checked Everything" — The Actual Cause

• In the context of P0513, the equivalent of a 'smoke test clean' scenario is when both the primary and spare keys are confirmed to be good, yet the no-start condition persists. In several owner-reported cases on the ProMaster, the root cause was found to be a poor or corroded main engine-to-chassis ground strap. This weak ground connection creates electrical noise and voltage drops that corrupt the communication between the PCM and RF Hub, leading to a false immobilizer error even though all security components are functional.

OEM Part Supersession History

• 68434595AC, 68434595AD, 68434595AE, 68525460AA → 68525460AB — Part has been revised by the manufacturer for improved reliability or to consolidate previous versions.
  Heads up: The newest part number (68525460AB) should be used for replacement, as it is the latest revision. Always verify the correct part number with the vehicle's VIN before ordering.

Model Year Variations Within This Range

• 2022: The 2022 model year marked a significant refresh for the ProMaster. Changes relevant to diagnostics include a new 9-speed automatic transmission (which has its own TCM, altering the CAN bus network), electric power steering, a new instrument cluster, and the Uconnect 5 infotainment system. These changes mean that wiring diagrams, module locations, and diagnostic procedures may differ significantly from 2018-2021 models.