P0513 on 2018-2022 Ram 1500: Invalid Key & No-Start Fixes

What's Unique About the 2018-2022 Ram 1500

This code is particularly significant on these trucks due to two well-documented issues. First, as highlighted in TSB S2208000073, P0513 frequently appears after the PCM has been replaced or its software updated ('flashed'). This indicates a sensitive 'handshake' process between the PCM, BCM, and RF Hub that requires a specific dealer procedure called 'Proxy Configuration Alignment' to re-sync. Second, on 5th generation (2019+) trucks, the RF Hub module is mounted on the rear cab wall below the window, making it highly susceptible to failure from water intrusion caused by a leaking third brake light or rear window frame. 🎬 See how to fix these common leaks for under $60. This is a widely discussed failure point in owner forums.

Diagnostic Flowchart

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

Generation note: This range covers the end of the 4th generation Ram 1500 (2018 'DS' platform, also sold as 'Classic' from 2019+) and the start of the 5th generation (2019-2022 'DT' platform). While the underlying anti-theft principles are the same, the specific modules (like the RF Hub) and software can differ. The 5th Gen 'DT' is particularly known for RF Hub failures due to water leaks from the rear window. Both generations are susceptible to the PCM programming issue outlined in TSB S2208000073.

Symptoms You May Notice

• Engine cranks but will not start.
• Engine starts and immediately stalls (typically within 2 seconds).
• Flashing red security light on the instrument panel.
• Check Engine Light is on.
• Key fob does not lock or unlock doors.
• "No Valid Key" message on the instrument cluster.

Most Likely Causes

1. PCM/RF Hub Programming Mismatch 🔴 High Probability As noted in TSB S2208000073, this code frequently occurs after a PCM software flash or replacement if the security handshake procedure is not completed correctly. The PCM defaults and loses the vehicle's specific security code, causing a mismatch.
   How to confirm: This is confirmed if the P0513 code appears immediately after the PCM was serviced. A dealer-level scan tool is needed to check the security status between the modules and will likely show an active P0513 and potentially a U0426-62 code.
   Typical fix: Perform the 'PCM Replaced' or 'Proxy Configuration Alignment' procedure using a compatible scan tool (like wiTECH) to re-establish the security handshake between the PCM, BCM, and RF Hub. 🎬 Watch: A professional walkthrough of the Proxy Configuration Alignment process. This restores the correct security code in the PCM.
   Est. part cost: $0
2. Faulty Radio Frequency Hub (RF Hub) 🔴 High Probability On 5th Gen (2019+) models, the RF Hub is located on the rear cab wall and is prone to failure from water damage caused by leaks from the third brake light or rear window frame. Even without water, the module can fail internally.
   How to confirm: A diagnostic scan tool is needed to check for communication errors with the RF Hub. A visual inspection of the module may reveal signs of water damage or corrosion. 🎬 Watch: See how a rear window leak ruins the RF Hub. The failure often presents as the key fobs completely stop working (for locks and start) and the alarm may sound when entering with the manual key.
   Typical fix: Replace the faulty RF Hub and program the new one to the vehicle, along with all existing keys. This must be done by a dealer or a properly equipped shop. A used RF Hub cannot be reprogrammed to a different vehicle.
   Est. part cost: $200-$500
3. Faulty Key Fob 🟡 Medium Probability The transponder chip inside the key fob can fail over time due to being dropped or from internal electronic failure. The battery inside the fob can also die, though this sometimes allows for an emergency start by pushing the start button with the fob.
   How to confirm: Try starting the vehicle with a spare key. If the spare key works, the original key is faulty. Replacing the CR2450 battery is an easy first step. If a locksmith's tool cannot read the key, it has failed.
   Typical fix: Replace the faulty key fob and have the new key programmed to the vehicle by a dealer or automotive locksmith.
   Est. part cost: $150-$400
4. Wiring Harness Issue ⚪ Low Probability Corrosion or damage to the wiring between the RF Hub, BCM, and PCM can interrupt the security signal. This can be caused by the same water leaks that damage the RF Hub or from rodent damage.
   How to confirm: Visually inspect the wiring harnesses connected to the security modules. A multimeter is needed to check for continuity and proper voltage at the module connectors.
   Typical fix: Repair or replace the damaged section of the wiring harness.
   Est. part cost: $50-$300

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): While less common than a programming error, the PCM itself can fail internally, causing it to lose its security programming or ability to communicate. This is often a last resort after all other causes have been ruled out.
• Radio Frequency Interference: Strong radio frequency signals from other devices, or even another RFID key on the same keychain, can sometimes interfere with the signal from the vehicle's key fob, causing a temporary P0513 code.

Diagnosis Steps

1. Verify the P0513 code is active using an OBD-II scanner.
2. Try starting the truck with a known-good spare key. If it starts, the primary key is the issue.
3. Replace the battery (typically a CR2450) in the key fob that is not working.
4. If the key fob has a physical key, try the emergency start procedure: push the Start/Stop button with the nose of the key fob. This may work if the fob battery is dead but not if the RF Hub has failed.
5. Observe the dashboard for a flashing red security light, which confirms an active immobilizer issue.
6. If the issue occurred immediately after a PCM replacement or software update, the cause is almost certainly a programming mismatch. Follow TSB S2208000073 and perform the 'PCM Replaced' or 'Proxy Configuration Alignment' routine with a dealer-level scan tool.
7. For 2019+ models, inspect the area around the RF Hub on the rear cab wall for signs of water intrusion from the rear window or third brake light.
8. Use an advanced scan tool to check for communication with the Radio Frequency Hub (RF Hub) / Wireless Control Module (WCM). Check for related U-series or B-series codes.
9. Inspect the wiring and connectors at the RF Hub and PCM for any visible damage or corrosion.
10. If all else fails, suspect a faulty RF Hub or PCM. Replacement of either module requires programming by a dealer or specialist.

Parts You'll Likely Need

• Key Fob — The transponder chip in the original key may have failed. A new key must be programmed to the truck's security system. Dealer programming can cost around $90-$100.
  Trusted brands: Mopar
  OEM price range: $200-$400
  Aftermarket price range: $70-$200
• Radio Frequency Hub (RF Hub) / Wireless Control Module (WCM) (OEM #68363199AC, 68363202AC, 68441616AA (Part numbers supersede; always verify with VIN)) — This module reads the key's signal and communicates with the PCM. It can fail electronically or due to water damage, requiring replacement and programming.
  Trusted brands: Mopar
  OEM price range: $200-$500
• Powertrain Control Module (PCM) — Required if the module itself has failed internally. More often, it just needs to be reprogrammed, but failure is possible. Replacement requires extensive programming to match the vehicle's VIN and security information.
  Trusted brands: Mopar
  OEM price range: $500-$1000+
  Aftermarket price range: $300-$700

Related Codes That Often Appear With This One

• U0426-62 (MiniKrypt Error Signal Compare Error): This code is specifically mentioned in TSB S2208000073 as appearing alongside P0513 after a PCM flash.
• B1A28-00 (ECM MISMATCH WITH SKIM): This code stored in the RF Hub directly points to the security handshake failure that causes P0513.
• B2205-00 (Original VIN Missing/Mismatch): This code is set in the security module (PEM/RFH) when it detects a VIN that does not match what is stored in its memory. This confirms a module mismatch and is often seen after an incorrect part replacement.

Technical Service Bulletins (TSBs) & Recalls

• S2208000073: No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting.
• 23-074-23 / 23-098-23: These TSBs address the root cause of many RF Hub failures: leaks from the third brake light and rear window frame, respectively.

Platform-Specific Known Issues

• TSB S2208000073 explicitly states that code P0513 can be set after a PCM is flashed or replaced, causing a no-start condition. The fix is to perform the 'PCM Replaced' procedure to re-sync the security information between the vehicle's modules.
• Water Intrusion on 5th Gen (DT) Models: A widely reported issue is the rear window frame cracking or the third brake light leaking, allowing water to drip directly onto the RF Hub mounted on the rear cab wall, causing it to fail.

Mechanic-Grade Diagnostic Values

• RF Hub Module Power Supply — expected: Battery voltage (10.0V - 16.0V). Failure: No voltage or low voltage
• RF Hub Module Ground — expected: Good continuity to ground. Failure: High resistance or an open circuit

Hidden / Shadow Codes Worth Checking

• B2205-00: Original VIN Missing/Mismatch. This code is set in the security module (like the RF Hub) when it is installed on a vehicle and the VIN it reads from the PCM does not match the VIN it has stored from a previous vehicle. It confirms a module programming or compatibility issue. (see via This is a Body-series (B-code) that requires a dealer-level scan tool like wiTECH or a high-end aftermarket scanner capable of reading BCM/RFH modules.)

Scan Tool Commands That Help

• wiTECH (or equivalent advanced scanner): Proxy Configuration Alignment — This is the primary function to use after replacing a module (PCM, BCM, RFH) or after a PCM flash that triggers P0513. It re-synchronizes the configuration data across all modules on the CAN bus.
• wiTECH (or equivalent advanced scanner): PCM/ECM/ESL replace — This specific routine, found under the BCM 'Misc. Functions' menu, must be run when the PCM itself has been physically replaced. It transfers the immobilizer data to the new PCM before the Proxy Alignment is run.
• wiTECH (or equivalent advanced scanner): Read RF Hub PIN — When programming new keys or a new RF Hub, the vehicle's 4-digit or 6-digit security PIN is required. A scan tool with immobilizer access can read this PIN from the vehicle's modules to allow for the programming procedure.

Wiring & Ground Locations

• Radio Frequency Hub (RF Hub) — On 5th Gen (2019+) models, it is mounted on the rear cab wall, below the rear window. On 4th Gen 'Classic' models, it is also on the rear cab wall, requiring removal of the rear seat bench for access.. This is the central module for the immobilizer system. Its physical location on 5th Gen trucks makes it vulnerable to water damage from rear window leaks, a primary cause of P0513 on those models.
• Fuse F52 (4th Gen 'Classic') — In the under-hood fuse box (Power Distribution Center). It is typically a 5-amp fuse.. On 2013-2018 models, fuse F52 provides power to the Radio Frequency Hub. If this fuse is blown, the RF Hub will be offline, causing a no-start and P0513.

Real Owner Repair Stories

• RamForum.com user (2007 Ram 3500 5.9L (Note: older model but demonstrates a relevant electrical issue)) — Intermittent no-start with P0513. Key fob would stop working for locks/unlocks, and the truck would start and die. The issue would sometimes resolve itself for days or weeks.
  ❌ Tried (didn't work) Replacing key fob battery., Reprogramming both keys by a locksmith., Disconnecting the main vehicle battery for hours.
  ✅ What actually fixed it The owner found a corroded battery cable connection at the main fuse panel. Cleaning this corrosion temporarily fixed the problem, indicating the root cause was an intermittent power or ground issue due to the corrosion, not a failed security module. This highlights the importance of checking basic electrical connections even with complex security codes.
• YouTube video by a mechanic (2019 Ram 1500) — Complete no-start, no accessory power, no response from push-to-start button.
  ❌ Tried (didn't work) Initial diagnosis was confusing as the dash was completely dead.
  ✅ What actually fixed it The mechanic identified it as a common issue and replaced the Radio Frequency (RF) Hub. Immediately after installing the new module and reconnecting the battery, the dashboard lit up with a "Key Fob Not Detected" message. This confirmed the old RF Hub was dead and the new one was communicating, even before programming the keys to it. The final fix was replacing the RF Hub and programming the keys.

OEM Part Supersession History

• 68363199AC, 68363202AC → 68441616AA — Standard part revision and consolidation by the manufacturer.
  Heads up: Crucially, a used RF Hub of any part number cannot be programmed to a different vehicle. The VIN is hardcoded into the module upon initial programming. If replacement is needed, a new, unprogrammed module must be purchased.

Model Year Variations Within This Range

• 2019-2022 ('DT' Platform): The RF Hub is located on the rear cab wall, making it highly susceptible to water damage from a known issue with leaking rear window frames or third brake lights. This is the most common cause of P0513 on these specific model years.
• 2018 ('DS' Platform / 2019+ 'Classic'): While the RF Hub is in a similar location on the rear cab wall, the water leak issue is far less prevalent than on the 5th Gen 'DT' models. Failures on these trucks are more commonly related to programming issues (per TSB S2208000073) or standard electronic failure of the key or module.