U1424 on 2009-2018 Ram 3500: Implausible Engine Torque Signal Fixes

What's Unique About the 2009-2018 Ram 3500

On Ram trucks from this era, U1424 is frequently a software issue. Chrysler (now Stellantis) has released numerous Technical Service Bulletins (TSBs) for various models, including Ram trucks, where the official fix for U1424 is to reprogram the PCM and/or TCM with updated software. This suggests that the original factory software was often too sensitive or had bugs that caused these communication conflicts during normal operation. The issue is so prevalent that diagnostic advice often points to checking for software updates as a primary step before any hardware replacement.

Generation note: This range covers the end of the third generation (2009, as Dodge Ram) and the majority of the fourth generation (2010-2018, as Ram). The underlying cause—a communication issue between the PCM and TCM, often software-related—is common to both generations within this timeframe. The 6.7L Cummins diesel and associated transmissions (68RFE, Aisin) are common across these years, sharing the same control module architecture.

Symptoms You May Notice

• Check Engine Light (MIL) is on
• Traction Control or Electronic Stability Control (ESC) light is on
• Vehicle may enter 'limp mode' with reduced power
• Harsh or erratic transmission shifting
• Service Electronic Throttle Control message may appear
• Service Trailer Brake Controller message may appear

Most Likely Causes

1. Outdated Powertrain or Transmission Control Module Software 🔴 High Probability Numerous TSBs across the Ram/Dodge/Chrysler lineup point to software updates as the primary fix for this code. TSB 18-021-17 specifically addresses U1424 on 2013-2015 Ram trucks with a PCM flash. TSB 18-062-17 also lists U1424 as a code resolved by a PCM reflash.
   How to confirm: A dealer or a shop with a subscription-based scan tool (like wiTECH) can check the current software calibration level against the latest available version from the manufacturer. You can call a dealer with your VIN to see if any open campaigns or applicable TSBs exist for your truck.
   Typical fix: Reprogramming/flashing the PCM and/or TCM to the latest software version. This often resolves the code permanently.
   Est. part cost: $0
2. Weak or Failing Battery / Poor Charging System Performance 🟡 Medium Probability Modern trucks are packed with sensitive electronics. Ram 3500s with the Cummins engine have a dual-battery setup, doubling the potential points of failure. Low voltage during startup or operation is a very common cause of communication glitches between modules, triggering U1424. Owners often report that replacing old batteries resolves mysterious electronic issues.
   How to confirm: Perform a load test on both batteries individually. Check the alternator's output voltage (should be 13.5-14.5 volts). On dual-battery systems, it's crucial to disconnect one battery to test for a parasitic draw on the other. A visual inspection for corroded terminals is also necessary.
   Typical fix: Replace one or both failing batteries. It is recommended to replace both batteries at the same time to ensure they are balanced. Address any charging system issues (e.g., replace alternator, check connections and fuses).
   Est. part cost: $300-$800 (for two batteries)
3. Underlying Engine Performance Issue 🟡 Medium Probability If another problem like a misfire (P030x) or a faulty sensor (e.g., crankshaft position sensor, camshaft position sensor) is present, the engine's actual torque can differ from what the PCM calculates. This causes other modules like the TCM to flag the data as implausible. A failing sensor can send erratic data, leading to this communication fault as a secondary code.
   How to confirm: Scan for other DTCs. If codes for misfires (P030x), camshaft/crankshaft sensors (P0335, P0344), or throttle position sensors are present, diagnose and fix them first. The U1424 code will likely clear once the primary issue is resolved.
   Typical fix: Resolve the primary fault code. For example, replace a faulty crankshaft position sensor, fix a misfire, or address an oil pressure issue that could affect VVT systems on gas engines.
   Est. part cost: $50-$500
4. Wiring Harness or Connector Issue ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness and connectors between the PCM, TCM, and ABS module for any signs of corrosion, damage, or loose pins. A common area for damage is the harness near the transmission, which can be exposed to heat and debris. This requires referencing a wiring diagram and may involve checking for continuity and shorts in the CAN bus wires.
   Typical fix: Repair the damaged section of the harness or clean/replace the corroded connector. In a documented case, a fire near the transmission melted part of the harness, requiring individual wire repair to fix communication issues.
   Est. part cost: $20-$200

Rare But Worth Checking

• Faulty Control Module (PCM, TCM, or ABS Module): This is rare and should only be considered after all other possibilities, especially software updates, battery health, and wiring checks, have been exhausted.
• Interference from Aftermarket Electronics: Poorly installed remote starters, alarms, performance tuners, or even LED lighting can disrupt CAN bus communication and trigger this code. If the code appeared after installing an accessory, that should be the first place to investigate.

Diagnosis Steps

1. Check and record all stored fault codes in all modules (PCM, TCM, ABS, BCM). Pay close attention to any engine performance or sensor codes.
2. Test the battery and charging system. On diesel models, test BOTH batteries individually under load. Ensure alternator output is between 13.5-14.5 volts. This is the most crucial first step.
3. Address any other engine performance or sensor-related codes first. The U1424 is often a secondary code resulting from another problem.
4. Using a dealer-level scan tool (wiTECH), check for available software updates for the PCM and TCM. TSBs like 18-021-17 are specific to this issue. If updates are available, perform the flash procedure.
5. If software is current and no other codes exist, inspect the CAN bus wiring harnesses and connectors between the PCM, TCM, and ABS module for damage, corrosion, or loose pins. Check for interference from any aftermarket electronics.
6. If all other steps fail, a faulty control module may be the cause, but this is the least likely scenario and should be the last diagnostic step.

Parts You'll Likely Need

• Powertrain Control Module (PCM) Software Update — This is not a physical part, but a service. It is the most frequently documented fix in TSBs for this specific code on Ram vehicles.
  OEM price range: $150-$250
  Aftermarket price range: N/A
• Battery (x2 for Diesel) — A weak battery is a common cause of various electronic and communication faults in modern vehicles. Diesel models use two batteries, and both should be replaced together.
  Trusted brands: Mopar, Interstate, DieHard

Related Codes That Often Appear With This One

• P1DD2 — This code, 'Torque Request Signal From TCM Denied,' is a direct consequence of the communication breakdown that also causes U1424. The TCM is actively refusing the torque data.
• U0402 — This code means 'Invalid Data Received From TCM,' indicating a two-way communication problem between the engine and transmission modules.
• P0300 - P0308 — Misfire codes can cause the engine's actual torque to fluctuate, leading the TCM to flag the PCM's torque signal as implausible.
• P0335 / P0339 — Crankshaft Position Sensor codes can cause incorrect engine speed and load calculations, which are critical inputs for the torque signal. A faulty crank sensor is a known cause for U1424.
• P0344 / P0349 — Camshaft Position Sensor codes can also disrupt the PCM's ability to calculate accurate torque, especially on VVT engines, leading to this code.

Technical Service Bulletins (TSBs) & Recalls

• 18-021-17: Specifically for 2013-2015 Ram trucks, calls for a PCM flash to fix U1424.
• 18-031-17 REV. B: Notes U1424 on Ram 1500, pointing to a pattern of this code on Ram trucks.
• 18-001-16 REV. C: Cites U1424 in the TCM memory on Ram 1500s.
• 18-103-16 REV. B: Lists U1424 along with several sensor codes, indicating a PCM software update can resolve multiple issues at once.
• 18-062-17: A TSB for other FCA models that lists U1424 as a primary code fixed by a PCM software reflash.
• 18-081-19: Another TSB for an FCA vehicle where a PCM update resolves U1424, P1DD2, and U0402.
• 18-023-21: A PCM flash for 2016 Ram 2500/3500 with the 6.7L Cummins to address various issues including shift quality and reduced power, demonstrating the manufacturer's use of software to fix drivability complaints.

Platform-Specific Known Issues

• Multiple Technical Service Bulletins (TSBs) exist for Ram and other FCA vehicles that explicitly list U1424 as a code resolved by a PCM software update. For example, TSB 18-021-17 was issued for 2013-2015 Ram trucks to address this.
• The issue is so commonly related to software that diagnostic procedures often point to checking for TSBs as a primary step.
• On 6.7L Cummins models, the dual-battery system is a significant factor. A single weak battery can cause system voltage to drop enough during startup (especially when the grid heater cycles) to cause module communication errors, setting this code.

Mechanic-Grade Diagnostic Values

• CAN C Bus Resistance — expected: Approximately 60 ohms. Failure: A reading of 120 ohms indicates an open circuit or a problem with one of the two terminating resistors. A reading near 0 ohms indicates a short between the CAN C (+) and CAN C (-) wires.
• Battery Voltage During Module Flashing — expected: Maintain between 13.2 and 13.5 volts. Failure: Dropping below 13.2V or climbing above 13.5V can interrupt the flash process and potentially damage the module.
• Alternator Output Voltage — expected: 13.5 - 14.5 volts at idle. Failure: Voltage below this range indicates a weak alternator that cannot properly charge the battery/batteries, leading to low voltage communication faults.

Scan Tool Commands That Help

• wiTECH: Reprogram PCM/TCM — This is the primary repair procedure when a relevant TSB exists for the U1424 code. The function updates the module's software to a newer version that corrects logic errors.
• wiTECH: Clear All DTCs — This function should be performed after any module reprogramming to ensure that stored faults from the flashing process are removed from all vehicle modules.
• OBD-II Scanner with advanced functions: Reset Adaptive Memory / Keep Alive Memory Reset — After resolving the root cause of U1424 (like a sensor replacement or wiring repair), resetting the transmission's adaptive memory can help resolve shifting issues more quickly by forcing the TCM to relearn shift patterns immediately.

Wiring & Ground Locations

• CAN C and CAN IHS Hubs — Located under the dash, near the steering column shaft and gauge cluster.. These hubs are central connection points for the CAN bus network. A loose connection or corrosion here can disrupt communication between multiple modules, causing network codes like U1424.
• G301 / G302 — Located on the left front body structure.. These are major body ground points. A poor ground connection at these locations can introduce electrical noise and voltage irregularities, disrupting module communication.
• TCM (68RFE Transmission) — For trucks with the 68RFE transmission, the TCM is integrated into the Powertrain Control Module (PCM), which is located on the driver's side of the engine block.. Knowing the TCM is part of the PCM is critical. Technicians will inspect the large PCM connectors for issues rather than searching for a separate transmission module.
• TCM (Aisin Transmission) — For trucks with the Aisin transmission (common on high-output Cummins models from 2013+), the TCM is a separate module located under the dash, to the left of the brake pedal.. This is a separate module with its own connectors and wiring that could be a point of failure, distinct from the PCM.

Real Owner Repair Stories

• DodgeForum.com user 'moparman139' (2014 Ram 1500 SLT 4WD 5.7L Hemi with 38,000 miles) — Check engine light on, traction control light off, transmission would not shift out of first gear.
  ❌ Tried (didn't work) The user took the vehicle directly to the shop for diagnosis.
  ✅ What actually fixed it The dealer found a bad camshaft position sensor (related to a P0344 code) and also reprogrammed the ECM and TCM. The U1424 and P1DD2 codes were considered secondary faults caused by the faulty cam sensor.
• RamForum.com user 'BigWhiteSnake' (2013-2015 Ram Truck (DS body)) — Sudden limp mode at highway speed (70 mph), check engine light, traction control light, and a message about the brake controller.
  ❌ Tried (didn't work) User was seeking advice before attempting repairs.
  ✅ What actually fixed it A responding technician pointed to TSB 18-021-17, which calls for a PCM software flash to resolve U1424 on these specific trucks. The recommended fix was to have a dealer perform the software update.

Model Year Variations Within This Range

• 2013-2018: Ram 3500 models could be equipped with either the Chrysler 68RFE or the Aisin AS69RC automatic transmission. Standard-output Cummins engines typically used the 68RFE, while high-output models used the Aisin. This is critical for diagnosis, as the 68RFE's TCM is integrated with the PCM on the engine block, whereas the Aisin has a separate TCM under the dashboard.
• 2013-2014: A significant refresh occurred for the 2013/2014 model years, introducing a stronger frame, new suspension options (including rear air suspension), and making the 6.4L HEMI V8 available. These changes introduced more complex electronic systems (like the air suspension module) that communicate on the CAN bus, increasing potential sources for network codes.
• 2013-2015: A recall (R40) was issued for software vulnerabilities in the radio unit that could allow unauthorized remote access to vehicle control systems. While not directly causing U1424, it highlights the interconnected nature of the vehicle's network and the importance of ensuring all module software is up to date.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Front End "Death Wobble" 🔴 High — Common on solid front axle trucks, especially after hitting a bump at highway speeds. Worsens with worn components or improper lift kits. Can occur at any mileage but is more frequent on trucks over 75,000 miles. (Ref: Multiple TSBs exist for steering dampers, but the root cause is typically worn components like the track bar, ball joints, or tie rod ends.)
• 68RFE Transmission Weaknesses 🟠 Medium — Common in trucks used for heavy towing or with performance tunes. Issues include valve body failure, torque converter shudder, and burnt clutches. (Ref: TSB 21-012-25 (for newer models) addresses some internal failures, but for the 2009-2018 range, issues are typically addressed with aftermarket upgrades.)
• 6.7L Cummins Emissions System Problems 🟠 Medium — EGR cooler and valve failures, and DPF/SCR sensor issues are common, particularly on trucks that see a lot of short trips or idling. Problems can start appearing after 60,000-80,000 miles. (Ref: Numerous TSBs exist for flashing the PCM to address emissions component logic and performance.)
• Totally Integrated Power Module (TIPM) Failure 🔴 High — More common on 2006-2012 models. Can cause a wide range of random electrical issues, from fuel pump failure to wipers and lights acting erratically. (Ref: No specific recall for all models, but it's a widely known failure point. Remanufactured units are a common fix.)
• Blown Head Gasket on Tuned Engines 🔴 High — While the base engine is robust, adding aggressive performance tunes significantly increases the risk of head gasket failure due to increased cylinder pressures.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For a wiring harness repair, a used pigtail connector from a junkyard is a cost-effective choice. A used TCM can be an option, but ONLY if you have a confirmed path to get it reprogrammed, as it is not plug-and-play.

Donor-vehicle mileage cap: roughly under 100000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a TCM, verify the part number exactly matches the original.
• Ensure the donor vehicle did not have flood or fire damage.
• Inspect harness connectors for clean, un-corroded pins and no signs of brittleness or cracking.

OEM-only on this vehicle (don't cheap out):

• Powertrain Control Module (PCM)
• Transmission Control Module (TCM) - While used is possible, a new or professionally remanufactured OEM unit that is programmed to your VIN before shipping is a much safer bet to avoid compatibility issues.

Brands owners have reported issues with on this vehicle:

• Unbranded, no-name electronic modules from online marketplaces. These often have incorrect software or are not programmable, leading to wasted time and money.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P030X — Misfire codes that can cause actual engine torque to deviate from calculated torque, triggering U1424 as a secondary code.
• P0335 — Crankshaft Position Sensor circuit fault; erratic sensor data can lead to the 'implausible torque' signal associated with U1424.
• P0344 — Camshaft Position Sensor circuit intermittent; similar to the crank sensor, it causes data discrepancies that trigger U1424.
• P1DD2 — Often resolved by the same PCM software updates (such as TSB 18-081-19) that address U1424.
• U0402 — Invalid Data Received from TCM; frequently appears alongside U1424 during module communication glitches or software-related errors.

Frequently Asked Questions