U1111 on 2014-2017 Ram 3500 Diesel: Lost Odometer Message Fixes

What's Unique About the 2014-2017 Ram 3500

For this specific generation of Ram 3500 with the 6.7L Cummins engine and Aisin transmission, the U1111 code is formally addressed by the manufacturer. FCA (now Stellantis) issued TSB 21-017-19 REV. A, explicitly linking this code to a software issue within the Transmission Control Module (TCM). This is different from other vehicles where a U1111 code might point to a generic wiring or instrument cluster failure. Here, the problem and solution are well-documented, making diagnosis much more direct. On gas-powered Ram trucks of the same era with the 66RFE transmission, the TCM is integrated into the main engine computer (PCM), but on the 6.7L Cummins with the Aisin transmission, it is a separate, external module.

Diagnostic Flowchart

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

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) is on.
• Odometer display may blink, show dashes, or stop updating.
• Harsh or unusual shifting behavior, specifically noted as harsh 1-2, 2-3, or 3-4 shifts.
• Engine flare during shifts or delayed downshifts.
• Audible squawk noise on a 4-3 downshift (on trucks with the DF2 Aisin transmission).
• Other warning lights, like for the trailer brake controller or parking sensors, may appear intermittently.

Most Likely Causes

1. Outdated Transmission Control Module (TCM) Software 🔴 High Probability This is a known software issue acknowledged by FCA in TSB 21-017-19 REV. A for diesel-equipped trucks with the Aisin 6-Speed Automatic Transmission (sales code DF2 or DF3).
   How to confirm: A Ram dealer or a properly equipped independent shop can check the current software calibration of the TCM using a wiTECH scan tool and compare it to the latest version available.
   Typical fix: Reprogramming (flashing) the TCM with the updated software. This is a dealer-level procedure that requires a stable power supply during the process.
   Est. part cost: $0-$0
2. Engine Wiring Harness Chafing 🟡 Medium Probability A known issue exists where the engine wiring harness was routed without a securing clip, allowing it to rub against metal components. Common chafe points are the ECM/TCM bracket, the driver's side upper control arm, and the shock tower bolt. This can short out CAN bus communication wires.
   How to confirm: Remove the driver's side front wheel and wheelhouse liner for a thorough visual inspection of the harness in the identified chafe areas. Look for worn-through loom and damaged wires.
   Typical fix: Repairing the damaged wires and securing the harness away from the contact points using sleeves, anti-abrasion tape, and zip ties as outlined in service documents. 🎬 Watch: How to repair a damaged Cummins transmission wiring harness.
   Est. part cost: $10-$75
3. Failing Control Module (TCM or Instrument Cluster) ⚪ Low Probability While less common than software or wiring faults, any module on the network can fail internally. In one forum instance, a user with similar intermittent communication codes (U1111 and U0001) reported that replacing the TCM ultimately solved their problem.
   How to confirm: This is a process of elimination. If the software is up to date and all wiring is confirmed to be good, a diagnostic scan tool may be able to isolate the faulty module by observing which one drops off the network.
   Typical fix: Replacing the failed module (e.g., Transmission Control Module) and programming it to the vehicle.
   Est. part cost: $300-$800

Rare But Worth Checking

• Poor battery health or bad ground connections can cause low voltage, leading to unpredictable communication errors across various modules.

Diagnosis Steps

1. Scan for Codes: Use a professional-grade OBD-II scanner to confirm U1111 is present and note any other codes, especially other U-codes like U0001.
2. Check Battery and Grounds: Before diving into complex diagnostics, ensure the vehicle's battery is fully charged and that the main battery and chassis ground connections are clean and tight. Low voltage can cause myriad communication codes.
3. Check for TSBs: The first and most important step for this specific vehicle is to check for TSB 21-017-19 REV. A.
4. Verify Software Version: Have a dealer or qualified shop use a wiTECH scan tool to check if the TCM software is outdated. If it is, perform the reflash as per the TSB. This is the most likely fix.
5. Inspect Wiring Harness: If the software is current or the flash doesn't solve the issue, perform a thorough visual inspection of the engine wiring harness. Remove the driver's side wheel and wheelhouse liner to access known chafe points: the ECM/TCM bracket, upper control arm, and shock tower.
6. Test CAN Bus Network: If wiring appears intact, use a multimeter to test the resistance of the CAN bus circuits at the diagnostic port (typically pins 6 and 14). A healthy network should show approximately 60 ohms of resistance. Deviations suggest a wiring problem or a faulty terminating resistor.
7. Isolate Modules: As a final step, a technician may need to disconnect modules one by one from the CAN bus to see if communication is restored, which can help pinpoint a faulty module.

Parts You'll Likely Need

• Transmission Control Module (TCM) Software Update — This is the official fix documented by Ram in TSB 21-017-19 REV. A for the U1111 code on these trucks with the Aisin transmission.
  Trusted brands: Mopar
  OEM price range: $135-$250
  Aftermarket price range: N/A
• Transmission Control Module (TCM) (OEM #68227783AA (Note: Part numbers are frequently superseded and are highly VIN-specific. Always verify with a dealer)) — In the rare case that a software update doesn't work and the module itself is diagnosed as faulty, it will need to be replaced.
  Trusted brands: Mopar
  OEM price range: $500-$800
  Aftermarket price range: $300-$600
• Wiring Harness Repair Supplies — If the cause is harness chafing, you will need anti-abrasion tape, wire loom, and zip ties to repair and protect the damaged section.
  Trusted brands: Tesa, 3M
  OEM price range: $20-$75
  Aftermarket price range: $10-$40

Related Codes That Often Appear With This One

• U0001 — This code for 'High Speed CAN Communication Bus' often appears with other U-codes, indicating a general network problem rather than a single component failure.
• U1110 — Indicates 'Lost Vehicle Speed Message'. Since vehicle speed and odometer distance are related data points often originating from the same source (like the ABS module), a fault causing one can sometimes trigger the other.

Technical Service Bulletins (TSBs) & Recalls

• 21-017-19 REV. A: Flash: Transmission Control Module (TCM) Updates. This bulletin directly addresses the U1111 code and recommends a software update as the fix for trucks equipped with the 6.7L Cummins and Aisin automatic transmission. It also addresses a wide range of shift quality complaints.

Platform-Specific Known Issues

• A known software issue requires a TCM reflash as per TSB 21-017-19 REV. A. This TSB specifically calls out DTC U1111-00 - Lost Odometer Message on models with the 6.7L Cummins Diesel engine and Aisin 6-Speed Automatic Transmission (sales codes DF2 or DF3).
• There is a known potential for the engine wiring harness to chafe against the ECM/TCM bracket, upper control arm, or shock tower on the driver's side, which can cause this and other communication codes.

Mechanic-Grade Diagnostic Values

• CAN Bus Network Resistance — expected: Approximately 60 Ohms between CAN High (Pin 6) and CAN Low (Pin 14) at the OBD-II port with the battery disconnected.. Failure: A reading of 120 Ohms indicates a missing terminating resistor or an open circuit in the harness. A reading near 40 Ohms may suggest a third, unintended resistor on the network. A reading near 0 Ohms indicates a short between the CAN High and Low wires.
• CAN Bus Voltage (Key On, Engine Off) — expected: CAN High to ground should be between 2.5 and 3.0 VDC. CAN Low to ground should be between 2.5 and 2.0 VDC.. Failure: Voltages significantly outside these ranges, or a voltage of 0, indicate a circuit fault (short to power, short to ground, or open). A CAN High voltage below 2.5V or a CAN Low voltage above 2.5V is abnormal.

Hidden / Shadow Codes Worth Checking

• U1111-00: The '-00' suffix is a status byte provided by dealer-level scan tools like wiTECH. It specifies the fault type, in this case confirming 'Lost Odometer Message' with no subtype information. Its presence confirms the TSB is directly applicable. (see via Chrysler/FCA wiTECH Diagnostic Application)

Scan Tool Commands That Help

• wiTECH: Flash ECU / Reprogram Module — This is the primary function used to apply the software update from TSB 21-017-19 REV. A, which is the most common fix for this code.
• wiTECH: Reset Adaptive Values — This function should be performed after a TCM reflash or replacement to clear old learned shift data from memory.
• wiTECH: Quick Learn — After resetting adaptive values, this procedure must be run to allow the TCM to quickly relearn clutch fill times and pressures. Failure to do so will result in poor shift quality.
• wiTECH: PROXI Configuration Alignment — This routine is required after replacing or reprogramming certain modules to ensure all modules on the vehicle network recognize the new component and its configuration.
• AlfaOBD: Initialize Module / Odometer Correction — This is an advanced aftermarket tool function that can be used to program a used module (like an ABS module or instrument cluster) to the vehicle, which can be a workaround if a new part is unavailable.

Wiring & Ground Locations

• TCM Fuses — In the under-hood fuse box (also known as the TIPM) located in front of the battery on the driver's side.. The TCM is powered by several fuses. A loss of power can cause communication codes. Key fuses to check include F21, F22, F57, F64, F72, F77, and F78, though not all may be present depending on the specific truck configuration.
• Connector C130 — Located near the under-hood fuse box (TIPM).. On similar Ram platforms, this connector is a known point for corrosion to develop in the CAN bus wiring, leading to intermittent communication failures and 'U' codes. While not specific to U1111, it's a critical inspection point for any network fault.

Real Owner Repair Stories

• Turbo Diesel Register user 'TDickerson' (2016 Ram (model implied)) — Intermittent Check Engine Light with codes U1111 (Lost Odometer Message) and U0001 (CAN C Bus). Also experienced random warnings for the trailer brake controller and park sense system.
  ❌ Tried (didn't work) Multiple dealer visits where codes were cleared but the problem returned., Dealer stated Ram was 'working on a fix' but had no solution at the time.
  ✅ What actually fixed it Another user in the thread reported that their very similar issue was ultimately resolved by replacing the Transmission Control Module (TCM).

OEM Part Supersession History

• Multiple (e.g., 5150770AF, 5150771AG) → 68227783AA — Part revision and consolidation by the manufacturer.
  Heads up: Part number 68227783AA replaces a long list of previous numbers including 5150770AF, 5150770AG, 5150770AH, 5150771AE, 5150771AF, 5150771AG, 5150771AH, 5150772AG, 5150773AG, 5150950AA, 5150951AA, 5150952AA, and 5150953AA. Always verify the latest part number with a dealer using the vehicle's VIN.

Model Year Variations Within This Range

• 2014-2017: While the U1111 code on the 6.7L Cummins with the Aisin transmission points to a separate, external TCM, it is critical to note that on gas-powered Ram trucks (e.g., 6.4L Hemi with 66RFE transmission), the TCM functions are integrated into the Powertrain Control Module (PCM). This distinction is vital to avoid searching for a non-existent external module on the wrong truck.