U1424 on 2009-2018 Ram 2500: Implausible Engine Torque Fixes

What's Unique About the 2009-2018 Ram 2500

For Ram trucks of this era, U1424 is a notoriously common software-related issue. Chrysler (now Stellantis) released numerous Technical Service Bulletins (TSBs) advising a software update as the primary fix, indicating the original module logic was often too sensitive or had bugs. This means that unlike many other vehicles where this code might point directly to a bad part, for a Ram 2500 the first step is always to check if the PCM's software has been updated. A user on RamForum.com confirmed that a dealer flash based on a TSB is the standard first step. Ignoring this can lead to expensive and unnecessary parts replacement.

Generation note: This range covers the end of the third generation (2009) and the entire fourth generation (2010-2018) Ram 2500. The underlying cause—often software-related—is common to both generations, particularly the 4th gen, as confirmed by multiple TSBs targeting these model years.

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) is on.
• Traction control or stability control light is on.
• Vehicle enters a reduced-power "limp mode".
• Harsh, erratic, or delayed transmission shifting.
• Sudden loss of power while driving.
• In some cases, no noticeable symptoms other than the check engine light.
• Message about the brake controller may appear on the dash.

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability The manufacturer issued multiple TSBs to fix this exact code with a software update, confirming the original programming was flawed or too sensitive. TSB #18-103-16 REV. B is a key example for Hemi engines, and TSBs like #18-001-16 REV. C also address the issue.
   How to confirm: A Ram dealer or a shop with a wiTECH scan tool can check the current software calibration ID against the latest version listed in the TSBs for your VIN.
   Typical fix: Reprogramming (flashing) the PCM with the latest manufacturer software. This is a non-parts repair that typically takes about one hour of labor.
   Est. part cost: $0
2. Weak or Failing Battery 🟡 Medium Probability Modern trucks with multiple control modules are highly sensitive to voltage. A drop in voltage, especially during startup, can cause communication glitches between modules, triggering network codes like U1424.
   How to confirm: Perform a battery load test with a digital battery tester. A simple voltage check with a multimeter is not sufficient, as a failing battery can show 12.6V at rest but drop excessively under load.
   Typical fix: Replace the battery (or both batteries on Cummins models) and ensure the charging system (alternator) is functioning correctly.
   Est. part cost: $150-$500
3. Failing Crankshaft or Camshaft Position Sensor 🟡 Medium Probability The PCM uses data from these sensors to calculate engine speed and torque. If a sensor sends erratic data, the calculation becomes implausible, triggering U1424. TSB #18-103-16 REV. B lists this code alongside crankshaft sensor code P0335, showing a direct link.
   How to confirm: Scan for other codes. If P0335, P0339, P0340, or P0365 are present, diagnose that sensor first. Even without a specific code, the sensor could be failing intermittently.
   Typical fix: Replace the faulty sensor. It is strongly recommended to use OEM Mopar parts for these critical sensors to avoid compatibility issues.
   Est. part cost: $40-$130
4. Wiring Harness or Connector Issue ⚪ Low Probability Vibrations and exposure to the elements can cause wires to chafe or connectors to corrode, particularly in the harnesses between the PCM, TCM, and ABS module. The main PCM connectors on the firewall are a known spot for water intrusion or broken locking tabs.
   How to confirm: Visually inspect the wiring harnesses for any signs of damage, chafing against the frame or engine components, or corrosion in the connectors. Pay close attention to the harness near the transmission and where it routes over the engine.
   Typical fix: Repair the damaged section of the wire or clean/replace the affected connector.
   Est. part cost: $10-$100

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is extremely rare and should only be considered after all other possibilities, including software, sensors, and wiring, have been definitively ruled out.
• Aftermarket Performance Tuner or Remote Starter: Improperly installed or low-quality aftermarket electronics can interfere with the CAN bus network, causing communication errors. If you have one installed, returning the vehicle to the stock tune and physically disconnecting the device is a critical diagnostic step.

Diagnosis Steps

1. Scan for all Diagnostic Trouble Codes (DTCs) in all modules. Pay close attention to any other codes that are present, especially sensor-related codes.
2. Check for Technical Service Bulletins (TSBs). Using your VIN, have a dealer check for open TSBs related to U1424. TSBs like 18-103-16 REV. B (Hemi) or others often call for a PCM reflash as the primary fix. This should be your first step.
3. Test the Battery and Charging System. Perform a proper load test on the battery (or batteries). Low or unstable voltage is a common cause of network codes.
4. Diagnose Other Codes First. If codes for specific sensors (e.g., P0335 for crankshaft sensor) are present, diagnose and fix those first. The U1424 code is likely a symptom of that primary fault.
5. Inspect Wiring Harnesses. If the software is up to date and the battery is good, inspect the wiring harnesses between the PCM, TCM, and ABS module. Look for any chafing, corrosion, or loose pins, especially at the main PCM connectors on the firewall.
6. Consider Aftermarket Devices. If an aftermarket tuner, remote starter, or other electronic device is installed, return the vehicle to its stock configuration and disconnect the device to see if the code clears.
7. Sensor Diagnosis. If no other cause is found, the issue could be a failing sensor (like the crankshaft position sensor) even without a specific code for it, or in very rare cases, a faulty control module.

Parts You'll Likely Need

• Powertrain Control Module (PCM) Software Update — This is not a physical part, but a reflash of the PCM's software is the most common and manufacturer-recommended fix for this code on Ram trucks, as detailed in numerous TSBs.
  OEM price range: $150-$250
  Aftermarket price range: N/A
• Crankshaft Position Sensor (OEM #Mopar 5149169AA (for 6.7L Cummins), Mopar 56028815AA (for 5.7L Hemi)) — If the PCM software is current, a failing crankshaft sensor is a common hardware cause, as its data is essential for torque calculations.
  Trusted brands: Mopar, Bosch, NTK
  OEM price range: $70-$130
  Aftermarket price range: $40-$80
• Battery — Low or unstable voltage from a weak battery is a frequent cause of network communication faults on modern vehicles. Cummins models use two batteries, which should be replaced as a pair.
  Trusted brands: Interstate, DieHard, Duralast
  OEM price range: $250-$400
  Aftermarket price range: $150-$350

Related Codes That Often Appear With This One

• P0335 — Crankshaft Position Sensor Circuit. A fault in this sensor directly impacts the engine torque calculation, causing U1424 as a secondary code. TSB #18-103-16 REV. B explicitly links these two codes.
• P1DD2 — Torque Request Signal From TCM Denied. This is another communication code between the PCM and TCM, often appearing with U1424 and pointing to a software or network issue.
• U0402 — Implausible Data Received From TCM. This indicates a general communication problem with the transmission module, often linked to the same software or network issues causing U1424.
• P062A — Fuel Pump Control Performance. This code is mentioned alongside U1424 in TSB #18-031-17 REV. B, suggesting a related system fault that can be resolved by a PCM update.

Technical Service Bulletins (TSBs) & Recalls

• 18-031-17 REV. B: Addresses U1424 on 2017 Ram 1500 with 5.7L Hemi via PCM reflash.
• 18-103-16 REV. B: Addresses U1424 and P0335 on 2014-2015 Ram 1500s via PCM reflash.
• 18-027-16 REV. C: For 2016 Ram 2500/3500 with 6.7L Cummins, provides software updates for shift quality and other system enhancements.
• 18-043-17: For 2013 Ram 2500/3500 with 6.7L Cummins, provides software updates for various DTCs and system improvements.

Platform-Specific Known Issues

• Multiple TSBs, including #18-031-17 REV. B (for 5.7L Hemi) and #18-027-16 REV. C (for 6.7L Cummins), were issued for various Ram models, pointing to a PCM software update as the solution for U1424, confirming this is a widespread, known issue.

Mechanic-Grade Diagnostic Values

• CAN Bus Network Resistance — expected: ~60 Ohms. Failure: A reading of ~120 Ohms indicates an open in the CAN circuit or a missing terminating resistor. A reading near 0 Ohms indicates a short between the CAN High and CAN Low wires.
• PCM Flash Battery Voltage — expected: Must be maintained between 13.2 and 13.5 volts. Failure: Voltage dropping below 13.2V or climbing above 13.5V during the flash process can cause the procedure to fail or corrupt the module.
• Camshaft Position Sensor Circuit Resistance to Ground — expected: Above 100 Ohms. Failure: Resistance below 100 Ohms indicates a short to ground in the signal or supply circuit.

Hidden / Shadow Codes Worth Checking

• Permanent DTC (P-DTC): U1424 may be stored as a 'Permanent' code, which is a type of federally mandated trouble code that cannot be erased by clearing codes with a scan tool or disconnecting the battery. The vehicle's own on-board diagnostics must run and pass the specific monitor for that system before the code will be cleared automatically. (see via Most modern OBD-II scan tools can display permanent codes, but they cannot clear them. The code will only be removed after the root cause is fixed and the vehicle completes a full drive cycle, allowing the relevant system monitor to run and pass.)

Scan Tool Commands That Help

• wiTECH: View Network Topology — This is the initial view after connecting to the vehicle. It provides a color-coded map of all control modules, instantly showing which modules are not communicating, which have DTCs, and which have available software updates (flashes), guiding the diagnostic path from the start.
• wiTECH: PCM Reprogramming / Flash ECU — Used when a TSB indicates a software update is available to fix the U1424 code. The tool automatically downloads the correct file and guides the technician through the process.
• wiTECH: Transmission Quicklearn — This procedure must be performed after reprogramming the PCM on vehicles equipped with the 68RFE automatic transmission. It resets the transmission's adaptive learning values to ensure proper shifting with the new engine software.
• wiTECH: PCM Configuration — This routine, found in the PCM's 'Misc. Functions' menu, may be required after a flash or module replacement to ensure all vehicle options are correctly configured in the powertrain module.

Wiring & Ground Locations

• PCM Connectors — On the firewall in the engine bay, typically on the driver's side.. These are the main data hubs for the powertrain. They are a known weak point for water intrusion, pin corrosion, and broken locking tabs, which can directly interrupt the engine torque signal and cause U1424. Wiggling these connectors can sometimes replicate an intermittent fault.
• BCM Connector — In the driver's side footwell, up above the parking brake pedal area.. On 2013+ models especially, the Body Control Module is a central network hub. The main connector can be accidentally kicked or disconnected, and if its locking lever breaks, it can come loose and cause a loss of communication across the entire network, triggering U1424 and other codes.
• Crankshaft Position Sensor Connector — On the passenger side of the engine, where the engine block meets the transmission bell housing.. The wiring to this critical sensor is exposed to significant heat and potential road debris. Damage to this wire or connector will corrupt the primary signal used for torque calculation, directly leading to a U1424 code.
• OBD-II Data Link Connector — Under the driver's side dashboard.. Pins 6 (CAN-C High) and 14 (CAN-C Low) can be used to perform a network-wide resistance check to quickly verify the integrity of the main data bus wiring and its two terminating resistors.

Real Owner Repair Stories

• Reddit user Mcdw83 in r/AskMechanics (2016 Ram 1500, 3.6L V6, 160k miles) — Randomly going into limp mode, check engine light on, traction control off. Codes P0365, U1424, P1DD2.
  ❌ Tried (didn't work) Replacing the camshaft position sensor.
  ✅ What actually fixed it Replacing the battery. The user reported that after replacing the battery, the issue which had been occurring daily only happened one more time and then stopped completely for at least two weeks, suggesting the root cause was low/unstable voltage.
• RamForum.com user BigWhiteSnake (2013-2015 Ram Truck) — Sudden limp mode at 70 MPH, check engine light, traction control light, and brake controller message. Code U1424.
  ❌ Tried (didn't work) The user posted seeking advice before attempting repairs.
  ✅ What actually fixed it The immediate and primary advice from an experienced forum member was to contact a dealer with the VIN to check for a TSB-related PCM software update, noting it's the most common fix and may be covered under the emissions warranty.

"I Checked Everything" — The Actual Cause

• For network code U1424, the equivalent of a 'smoke test clean' scenario is when all wiring seems intact and sensors test correctly. In these cases, the cause is almost always one of two non-obvious issues: 1) Outdated PCM software with overly sensitive logic, which can only be fixed with a dealer reflash, or 2) An aging battery that provides sufficient voltage to start the truck but causes transient voltage drops that corrupt data packets on the CAN bus, triggering the code without pointing to a specific failed part.

When the Usual Fixes Don't Work

• While a PCM software update is the most common fix, there are numerous owner reports where the issue was ultimately traced to a weak or failing battery, even when the truck started normally. In one case, a user replaced the camshaft sensor as suggested by an accompanying code (P0365), but the U1424 and limp mode issues only resolved after replacing the battery. This underscores the need to load-test the battery before authorizing expensive software or sensor repairs.

Model Year Variations Within This Range

• 2013-2018: Starting in 2013, Ram trucks utilized a more complex Body Control Module (BCM) that integrated more of the vehicle's electrical functions compared to the earlier Totally Integrated Power Module (TIPM) system. A failure in this later BCM is more likely to cause widespread network issues, often setting code U0140 (Lost Communication With BCM) alongside U1424. This can point the diagnosis towards the BCM and its connectors in the driver's footwell as a possible cause.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Death Wobble 🔴 High — Common on solid front axle trucks, especially after hitting a bump at highway speeds. Worsens with worn suspension components or larger tires. (Ref: No specific recall, but numerous owner complaints. The root cause is typically worn track bar bushings/bolts, ball joints, or other steering components.)
• 68RFE Transmission Failures 🔴 High — Prevalent in trucks with the 6.7L Cummins, especially those used for towing or with performance tunes. Issues include torque converter shudder, slipping clutches, and valve body problems. (Ref: Software updates like TSB #18-027-16 REV. C were released to improve shift quality, but many failures are mechanical.)
• 6.7L Cummins EGR Cooler Failure 🟠 Medium — A known weak point, especially under heavy towing. The cooler can crack internally, leading to coolant loss, white smoke, and potential engine overheating. (Ref: No recall, but this is a widely documented failure. Upgraded aftermarket coolers are a common solution.)
• Exhaust Manifold Bolt Breakage (Hemi) 🟠 Medium — Common on the 5.7L and 6.4L Hemi engines. The bolts, particularly those at the rear of the cylinder heads, are prone to breaking, causing an exhaust leak and a ticking noise when the engine is cold.
• HVAC Blend Door Actuator Failure 🟡 Low — A frequent complaint where the heater may only blow on one side or fail to switch between vents. The repair often requires significant dashboard disassembly.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used wiring harness from a salvage yard can be a cost-effective fix for a physically damaged harness, provided the donor vehicle is from a dry climate and shows no signs of corrosion or impact damage.

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

What to inspect on the donor part:

• Check for intact connector locking tabs.
• Inspect for any signs of green or white corrosion on connector pins.
• Ensure the plastic wire loom is not brittle or cracked from excessive heat.
• Verify the donor vehicle's VIN to ensure it had a similar engine and feature set.

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

• Crankshaft Position Sensor
• Camshaft Position Sensor
• Powertrain Control Module (PCM)

Aftermarket brands forum-validated for this vehicle:

• Interstate, DieHard, Duralast (for batteries)
• Bosch, NTK (for sensors, if OEM is unavailable)

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' electronic sensors from online marketplaces are frequently cited on forums as being dead-on-arrival or failing quickly.

Real Owner Stories

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

Related OBD-II Codes

• P0335 — Crankshaft Position Sensor Circuit fault; often appears alongside U1424 because the PCM uses this sensor's data for torque calculations.
• P0339 — Crankshaft Position Sensor Intermittent; erratic data from this sensor can trigger the implausible torque calculation defined by U1424.
• P0365 — Camshaft Position Sensor Circuit; mentioned in owner reports and TSBs as a related sensor fault that can occur with U1424.
• P1DD2 — Often seen in conjunction with U1424 on Chrysler platforms, indicating a broader communication or torque calculation issue across modules.
• U0402 — Invalid Data Received from TCM; frequently paired with U1424 in TSBs (like #18-063-17) regarding software-related communication errors.
• P0340 — Camshaft Position Sensor Circuit; a primary sensor fault that should be diagnosed before U1424 as it provides the data the PCM uses for engine speed.

Frequently Asked Questions