U3017 on 2014-2019 Ram 2500: Control Module Timer/Clock Performance Fixes

What's Unique About the 2014-2019 Ram 2500

For this generation of Ram HD trucks, Chrysler (FCA/Stellantis) released numerous Technical Service Bulletins (TSBs) acknowledging that the U3017 code could be set without any actual hardware defect. TSB 18-053-14 REV. B explicitly states the software update is to "Prevent Or Reduce Malfunction Indicator Lamp (MIL) Illumination When No Defect Is Present For: U3017...". The diagnostic logic was often too sensitive, especially in cold weather or after a battery disconnect. This makes a PCM software update the primary and most crucial first step in diagnosis, a unique situation compared to codes that typically point directly to a failed part.

Diagnostic Flowchart

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

Generation note: The 2014-2018 model years belong to the fourth-generation Ram HD. The 2019 model year is an overlap, with both the fourth-generation ('Classic') and the new fifth-generation being sold. The available TSBs and owner reports for this code primarily address the fourth-generation platform with the 6.7L Cummins engine.

Symptoms You May Notice

• Check Engine Light (MIL) is on
• No noticeable drivability issues in most cases
• In rare cases on other platforms, may be associated with the clock losing time or scheduled features failing, but this is not a common complaint for Ram trucks with U3017.

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability → Shop Engine Control Module (ECM) Manufacturer TSBs #1805920, #1805416, #18-045-15, and #18-053-14REVB all list this code as being addressed by software improvements to prevent unnecessary MIL illumination. This confirms the factory calibration was overly sensitive.
   How to confirm: Contact a Ram dealership with your vehicle's VIN. They can check their system for applicable TSBs and confirm if a software update is available for your specific truck. A user on Turbo Diesel Register noted that the dealer must scan the truck to know the current software level before confirming an update is needed.
   Typical fix: Perform a PCM software update (reflash) at a dealership or qualified shop. The cost is typically one hour of labor, ranging from $150-$300.
   Est. part cost: $0
2. Low Battery Voltage or Weak Battery 🟡 Medium Probability → Shop Vehicle Battery Modern control modules are sensitive to voltage fluctuations. A weak battery, especially during cranking in cold weather, can cause modules to lose memory or set erroneous internal fault codes. This is common across many modern vehicles, including Rams. On Cummins models with dual batteries, one failing battery can draw down the healthy one, causing system-wide low voltage.
   How to confirm: Perform a load test on the battery (or both batteries on Cummins models). A simple voltage check is not always sufficient. Ensure the charging system is operating correctly (typically 13.5-14.5 volts). If replacing dual batteries, always replace them as a pair.
   Typical fix: Replace the weak or failing battery/batteries. Ensure battery terminals are clean and tight.
   Est. part cost: $150-$400
3. Improper Battery Disconnect Procedure ⚪ Low Probability → Shop Vehicle Battery If the battery is disconnected before the vehicle's modules have had time to power down completely (a process that can take several minutes), it can corrupt timer memory and set codes like U3017 and P2509. Diagnostic documentation specifically states to wait 10 minutes for the modules to power down before disconnecting the battery.
   How to confirm: This is diagnosed based on recent history. If the code appeared immediately after a battery replacement or service that required disconnecting it, this is the likely cause.
   Typical fix: Clear the code with a scan tool. The code may not return if this was the only issue. After clearing, leave the ignition on for five seconds, then off for one minute before restarting to allow timers to reset.
   Est. part cost: $0

Rare But Worth Checking

• Failing Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This should only be considered after all software updates have been performed and the battery/charging system has been confirmed to be in perfect health. A failing PCM is an expensive last resort, with replacement costs often exceeding $1,800. A specific TSB explicitly warns dealers *not* to replace any components for this code, as a software fix was planned.
• Faulty Body Control Module (BCM): → Shop Body Control Module Since the PCM uses timer data from the BCM for its rationality check, a faulty BCM could theoretically send bad data, causing the PCM to set U3017. This is very uncommon and should be considered only after exhausting all other possibilities.
• Recent Coolant System Service: Diagnostic documentation notes that a recent coolant change or low coolant level could potentially trigger the code, as the logic relies on a predictable coolant temperature drop. If the code appeared after coolant service, ensure the system is properly filled and bled, then clear the code and monitor.

Diagnosis Steps

1. Check Battery Health: Perform a load test on the battery/batteries. On Cummins models, test both batteries individually and replace them as a pair if one is weak. A healthy resting voltage should be ~12.6V.
2. Verify Charging System: With the engine running, check the alternator output. It should be stable and within the 13.5-14.5 volt range.
3. Check for Software Updates: Contact a Ram dealer with your VIN and ask them to check for any open TSBs or available PCM software updates related to code U3017. This is the most critical step. Be persistent, as some owners reported initial dealer confusion in 2014-2015 when the flashes were new.
4. Perform Software Update: If an update is available, have the dealer or a qualified shop perform the PCM reflash. This resolves the issue in the vast majority of cases. TSBs specify that the wiTECH software must be at release 15.02 or higher.
5. Clear Codes and Test Drive: After the update, clear all codes. The TSBs recommend a specific power-down procedure: key off for 10 minutes (automatic trans) or 75 seconds (manual trans). Then perform a complete drive cycle, including a cool-down period of several hours, to see if the code returns.
6. Inspect PCM Connections: If the code persists after an update, inspect the PCM connectors for corrosion or damage, and verify its power and ground circuits are intact.
7. Consider Module Replacement: Only if all previous steps fail should you consider replacing the PCM or BCM. This is an uncommon and expensive fix.

Parts You'll Likely Need

• Powertrain Control Module (PCM) Software Update — This is not a physical part, but a service. It is the most common fix, as multiple TSBs confirm the code is often caused by a software glitch that needs correction.
  Trusted brands: Mopar (Dealer Service)
  OEM price range: $150-$300
  Aftermarket price range: N/A
• Battery (OEM #BCG94RH7) — Low system voltage from a weak or failing battery is a known trigger for this and other electronic fault codes. On Cummins models with two batteries, it is critical to test both and replace them as a pair if one is faulty.
  Trusted brands: Mopar, Interstate, Odyssey
  OEM price range: $250-$450
  Aftermarket price range: $150-$400

Related Codes That Often Appear With This One

• P2509 — Often appears with U3017 when caused by low battery voltage or improper battery disconnection before the modules fully power down. Diagnostic procedures for U3017 specifically call out checking for P2509 first.
• P0116 — Engine Coolant Temperature Sensor Performance. TSB #1805920 lists this code alongside U3017 as being resolved by a software update, especially in cold weather.
• P0106 — Manifold Absolute Pressure Sensor Performance. TSB #1805920 mentions this code can be set with U3017 in extreme cold and is addressed by a software update.
• P0087 — Fuel Rail Pressure Too Low. Multiple TSBs (#1805416, #18-045-15, #1805314REVB) list this code with U3017 as being fixed by a PCM software update, suggesting the original software could set false codes.
• U1421 — Implausible Ignition Key Off Time Received. This code is directly related to the timer logic shared between modules. TSB #18-053-14 and TSB 18-030-14 REV. A list it alongside U3017 as being resolved by a software update.

Technical Service Bulletins (TSBs) & Recalls

• 1805920: Addresses U3017 along with P0116 and P0106, often related to cold temperatures.
• 1805416: Lists U3017 with several other powertrain codes fixed by a software update.
• 18-045-15 REV A: Cites U3017 as a code that can be set unnecessarily, addressed by a PCM reflash.
• 18-045-15: An earlier version of the above TSB, also mentioning U3017.
• 18-053-14 REV B: Explicitly states the software update is to prevent MIL illumination for U3017 when no defect is present.
• 18-053-14 REV A: Precursor to Rev B, also addresses U3017.
• 18-030-14 REV A: Another TSB from 2014 that bundles a fix for U3017 with other codes like P0128 and U1421.

Platform-Specific Known Issues

• TSB #18-053-14 REV. B explicitly mentions providing "Improvements To Prevent/ Reduce Malfunction Indicator Lamp (MIL) Illumination When No Defect Is Present For: U3017...", confirming this is often a ghost code.
• TSB #1805920 links U3017 to other codes like P0116 and P0106, particularly in extreme cold, with the fix being a software update.
• Forum users on Turbo Diesel Register and RamForum consistently report that a dealer software update was the ultimate fix after initial confusion. One user in late 2014 noted, "The flash was released on 11.11.14 - my truck was there and there were other updates including turbo and transmission... I noticed that it ran more efficiently and even accelerated different."
• The diagnostic can also be triggered during new vehicle prep when a dealer uses a scan tool to change the truck from 'Shipping Mode' to 'Customer Mode'. In this case, simply clearing the code may resolve the issue permanently.

Mechanic-Grade Diagnostic Values

• Battery voltage during reflash — expected: Stable between 13.2 and 13.5 volts. Failure: Voltage outside this range can cause the reflash to fail or corrupt the module.
• Battery voltage during engine cranking — expected: Should stay above 11.0 volts. Failure: A drop below 11.0V indicates a weak battery that can trigger erroneous codes like U3017.
• Module ground circuit resistance — expected: Under 0.1 Ω. Failure: Higher resistance indicates a poor ground connection, which can cause voltage irregularities and module faults.
• Engine Coolant Temperature Drop (for monitor to run) — expected: At least 10°C (18°F) drop after being shut down from an operating temperature of at least 76.6°C (170°F). Failure: If these conditions are not met, the diagnostic monitor for U3017 will not run.

Scan Tool Commands That Help

• wiTECH: PCM Reprogramming — This is the primary repair procedure outlined in multiple TSBs to install updated software that corrects the sensitive diagnostic logic causing the false code.
• wiTECH: PCM Configuration — This routine, found in the PCM 'Misc Functions' menu, must be performed after a successful PCM reflash to ensure the module is correctly configured for the vehicle's options.
• wiTECH: Quicklearn — For vehicles with a 68RFE automatic transmission, this procedure must be run after a PCM reflash to calibrate the transmission control module to the new software.
• wiTECH: Change Shipping Mode to Customer Mode — This function is used during new vehicle prep, but service documents note it can inadvertently set U3017. If the code appears after this procedure, it is considered a glitch and should simply be cleared.

Wiring & Ground Locations

• Body Control Module (BCM) — Located high in the driver's side dash, behind the lower panel, and held in place by four 10mm nuts.. The BCM provides the ignition-off timer data that the PCM uses for its rationality check. A poor connection or faulty BCM could send bad data, triggering U3017.
• BCM Fuses — In the under-hood fuse box (TIPM), located in front of the battery. Specifically, fuses F10, F12, F14, and F23 are related to the BCM.. Loss of power to the BCM due to a blown fuse would disrupt its timer functions and communication with the PCM.
• Powertrain Control Module (PCM) — Inside the driver's side fender, next to the battery and under-hood fuse box.. The PCM is the module that sets code U3017 based on its internal logic and data from the BCM. Its connections and grounds are critical.
• PCM/ECM Ground Splice — A critical #8 gauge Black/Tan ground wire for the PCM and other modules is routed in a conduit over the top of the alternator and connects to the negative terminal of the passenger-side (auxiliary) battery.. A poor connection at this splice or terminal is a known cause of various electronic issues, including module communication and timer faults, due to an unstable ground reference.
• Main Body Ground — Located on the radiator core support, near the driver-side battery.. A corroded or loose main body ground can cause a host of intermittent and difficult-to-diagnose electrical problems across the vehicle.

Real Owner Repair Stories

• Turbo Diesel Register Forum user 'DonFitzwater' (2014 Ram 2500 6.7L Cummins) — Check engine light came on the day after purchasing the truck, with code U3017.
  ✅ What actually fixed it A dealer-performed software update (reflash) a few weeks after purchase permanently resolved the issue.
• Turbo Diesel Register Forum user 'RikDavis' (Ram 2500 with 6.7L Cummins) — U3017 code appeared, sometimes listed as 'permanent' by a standard code reader, and occasionally accompanied by a low system voltage code.
  ❌ Tried (didn't work) Clearing the code with a standard reader, as it would return.
  ✅ What actually fixed it The owner identified a pattern: the code only appeared after leaving the key in the accessory position for an extended period, which drained the battery. After fully charging the batteries, the immediate issue was resolved. The final, permanent fix was applying the software update from TSB 18-030-14 REV. A.
• Turbo Diesel Register Forum user 'Reno Dave' (Ram with Cummins engine, 3600 miles) — U3017 code appeared.
  ✅ What actually fixed it The dealership performed an updated software reflash, which resolved the code.

When the Usual Fixes Don't Work

• While a PCM software update is the most common fix, it is not a guaranteed permanent solution in 100% of cases. One owner on the Turbo Diesel Register forum reported the U3017 code returned about a year after the initial software update was performed. The code appeared after the truck was idling for an extended period and shortly after unrelated work was done under the dash, leading the owner to suspect a potential intermittent connection issue rather than a software bug. This highlights the need to verify battery health and check for loose connections even if a software update has been previously applied.

OEM Part Supersession History

• TSB 18-018-13 REV. D → TSB 18-030-14 — Provided software improvements for the 6.7L Cummins PCM.
• TSB 18-030-14 → TSB 18-030-14 REV. A — Added further software enhancements to address U3017, U1421, and other diagnostic codes.
  Heads up: The updated TSB specifies that the dealer's wiTECH software must be at release 15.02 or higher to perform the procedure.

Model Year Variations Within This Range

• 2014-2019: The primary variation is the specific software calibration file needed for the PCM reflash, which is VIN-dependent. While the TSBs cover a range of years, anecdotal evidence from forums suggests the 2015-2016 model years were particularly prone to various emissions system and software-related issues, including this one.