P1607 on 2013-2016 Dodge Dart 2.4L: PCM Shutdown Timer Causes and Fixes

What's Unique About the 2013-2016 Dodge Dart

The Dodge Dart platform and its cousins (Chrysler 200, Jeep Cherokee) are well-known for setting code P1607 due to software anomalies rather than hardware failure. Chrysler (Dodge's parent company) issued multiple Technical Service Bulletins (TSBs) acknowledging that this code, often appearing with a cluster of others, can be triggered by software glitches that are resolved with a PCM reflash. This means the most common and effective fix for a Dart is a simple software update at a dealership, not an expensive component replacement. The vehicle's electrical system is also highly sensitive to battery voltage and poor ground connections, making these frequent secondary causes.

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) is on
• Engine may be hard to start or have a long crank time
• Occasional stalling
• Rough idle, especially on a cold start
• Unpredictable electrical behavior
• Engine startup flare and idle surge
• Flashing odometer if a used PCM was installed without a proxy alignment

Most Likely Causes

1. Outdated PCM Software 🔴 High Probability Chrysler released multiple TSBs to fix software bugs that cause this specific code on the Dart's 2.4L engine.
   How to confirm: A Dodge dealership or qualified shop can check your vehicle's VIN against TSBs #18-023-16 (Rev. D or later for 2013-2015 models) and #18-009-16 (for 2016 models) to see if a software update is available and has not been performed. The presence of other codes like P0335, P0456, and P2610 strongly indicates the software update is needed.
   Typical fix: Reprogramming (reflashing) the PCM and TCM with the latest software versions. This is a dealer or specialty shop procedure that takes approximately 0.3-0.5 labor hours.
   Est. part cost: $0 (service only)
2. Weak or Failing Battery 🟡 Medium Probability → Shop Vehicle Battery The Dart's electrical system is sensitive to voltage fluctuations. An unstable or low voltage during the ignition-off sequence can disrupt the PCM's internal timer, triggering the code. Some owners report better performance with a higher-spec AGM battery.
   How to confirm: Test the battery with a digital multimeter or an electronic battery tester. A healthy resting battery should show approximately 12.4-12.6 volts. A load test is recommended, which most auto parts stores can perform for free. A user on DodgeForum.com reported this exact fix solved their P1607 and hard start issue.
   Typical fix: Replace the battery and ensure the terminal connections are clean and tight.
   Est. part cost: $150-$300
3. Faulty PCM or ASD Relay ⚪ Low Probability The relay that supplies power to the PCM can fail over time due to heat and electrical cycles, causing an intermittent loss of power that triggers the P1607 code.
   How to confirm: Swap the PCM or ASD (Auto Shutdown) relay with an identical relay from a non-critical system (like the horn) in the fuse box. If the problem resolves or changes, the relay is bad. You can also test the relay's coil resistance with a multimeter; it should be around 150 Ohms or more.
   Typical fix: Replace the faulty relay. This is a simple, plug-and-play component in the under-hood fuse box. The Mopar Mini Relay is a common replacement.
   Est. part cost: $15-$40

Rare But Worth Checking

• Corroded or Loose Main Ground Connection: A poor ground between the engine/transmission and the chassis can cause intermittent voltage drops that mimic a failing battery. A well-documented case on YouTube for a 2013 Dart showed a no-crank, no-start condition caused by a corroded ground strap on the driver's side frame rail, accessible after removing the splash guard. Cleaning the contact points for the ground strap fixed the issue for $0. It's critical to inspect the main ground straps (G100/G102) for corrosion or looseness.
• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is a rare cause. The PCM should only be considered for replacement after a software reflash has been performed and all power/ground circuits, relays, and the battery have been confirmed to be good.

Diagnosis Steps

1. Check for Technical Service Bulletins (TSBs): The first and most important step. Contact a Dodge dealer with your VIN or use an online service to check for TSBs #18-023-16 and #18-009-16.
2. Test the Battery and Charging System: Ensure the battery has a resting voltage of 12.4V or higher and can pass a load test. Check that the alternator is charging between 13.5V and 14.5V when the engine is running.
3. Scan for Other Codes: Check for the presence of related codes like P2610, P0335, or the host of others listed in the TSBs. Their presence strongly suggests the software update is the required fix.
4. Perform PCM & TCM Reflash: If an applicable TSB is found and the battery is healthy, have a dealer or qualified shop perform the PCM software update. Crucially, ensure the Transmission Control Module (TCM) is also updated at the same time, as specified in the TSB.
5. Inspect Power and Ground Connections: Visually inspect the battery terminals and PCM connectors. Pay special attention to the main engine-to-chassis ground stud on the driver's side frame rail, accessible by removing the splash guard. Check for corrosion and looseness, as this is a known failure point.
6. Inspect PCM/ASD Relay: If the code persists after a reflash, locate the PCM or ASD relay in the under-hood fuse box. Inspect for corrosion and consider swapping it with a known-good relay to test.
7. Diagnose PCM: If all previous steps fail to resolve the code, the PCM itself may be faulty and require professional testing and potential replacement.

Parts You'll Likely Need

• PCM Software Update (Service) — This is not a physical part, but a service. It is the manufacturer-specified fix for a known software bug that causes code P1607 on this vehicle, as documented in multiple TSBs.
  Trusted brands: Mopar (via dealership service)
  OEM price range: $150-$250 (Labor)
  Aftermarket price range: N/A
• Automotive Battery — A weak or failing battery is the second most common cause, as low or unstable voltage disrupts the PCM's shutdown procedures.
  Trusted brands: Mopar, Interstate, DieHard, Duralast
  OEM price range: $200-$350
  Aftermarket price range: $150-$300
• PCM/ASD Power Relay (OEM #68053218AA) — A faulty relay can cause intermittent power to the PCM, triggering this code. It's an inexpensive and easy part to swap for diagnosis. The original part number may be 4727370AA, but 68053218AA is a common Mopar replacement.
  Trusted brands: Mopar, Standard Motor Products, Hella
  OEM price range: $20-$40
  Aftermarket price range: $15-$35

Related Codes That Often Appear With This One

• P2610 — This code for 'PCM Internal Engine Off Timer Performance' is closely related and often fixed by the same software update as P1607, as listed in TSBs for the Dart and its platform mates.
• P0335 — Crankshaft Position Sensor Circuit. TSBs #18-023-16 and #18-022-17 confirm that a PCM reflash for P1607 also corrects false P0335 codes.
• P0456 — EVAP System Small Leak. This is another seemingly unrelated code that is listed in TSB #18-023-16 as being resolved by the same PCM software update.
• P050D — Cold Start Rough Idle. This symptom and code are also addressed by the PCM software update specified in TSB #18-023-16.
• U0140 — Lost Communication With Body Control Module. This network code is also listed in TSB #18-023-16 as being fixed by the PCM software update.
• P0133, P0480, P2172, P1D73, P0441, P0116, U0402 — These codes (O2 Sensor Slow Response, Fan Control Circuit, High Airflow/Vacuum Leak, AGS Performance, EVAP Purge Performance, ECT Sensor Performance, Implausible Data from TCM) are all listed in TSB #18-023-16 Rev. B as being resolved by the same software update. Their presence further confirms a reflash is needed.

Technical Service Bulletins (TSBs) & Recalls

• 18-023-16 REV. D: For 2013-2015 Dart 2.4L, involves reprogramming the PCM to fix P1607 and a long list of other DTCs including P0335, P0456, P050D, U0140, and more. Also applies to the 2015 Chrysler 200.
• 18-009-16: For 2016 Dart 2.4L, addresses similar powertrain diagnostic improvements via a PCM reflash.
• 18-022-17 REV. A: Another PCM flash update for 2013-2015 models that addresses a group of DTCs, including P0335, which is often seen with P1607.
• 18-014-16 / 18-004-16: TSBs for the Jeep Cherokee (KL) with the 2.4L engine, fixing the same P1607 and P2610 codes with a software update, proving the issue is engine/software specific, not just chassis specific.

Platform-Specific Known Issues

• Main Ground Strap Corrosion: A recurring issue on Dodge Darts is corrosion at the main ground point on the driver's side frame rail. This connection grounds the engine block to the chassis. Corrosion here creates high resistance, leading to a host of electrical problems including no-start conditions and setting codes like P1607. A YouTube video by 'Matt's Garage' / 'Just-Fix-in Garage' provides a step-by-step guide on accessing this ground (behind the splash guard) and cleaning it to restore function, fixing a no-crank/no-start problem for free.
• Software Update Fixing Multiple Unrelated Codes: A user on dodge-dart.org reported having both P2610 and P1607. They first tried replacing the battery, which did not solve the problem. The issue was ultimately resolved by a dealership performing the PCM software update per the TSB, which cleared both codes permanently. This highlights the importance of checking for TSBs before replacing parts, even when the cause seems obvious.

Mechanic-Grade Diagnostic Values

• Battery Voltage (Resting, Engine Off) — expected: 12.4V - 12.6V. Failure: Below 12.4V indicates a weak or discharged battery that can cause PCM logic errors.
• Charging System Voltage (Engine Running) — expected: 13.5V - 14.5V. Failure: Voltage outside this range points to a faulty alternator or voltage regulator, which can cause unstable power to the PCM.
• PCM Power Relay Coil Resistance — expected: Approximately 150 Ohms or more. Failure: Significantly lower resistance or an open circuit (infinite ohms) indicates a failed relay.
• Battery Voltage During PCM Flash — expected: Must be maintained between 13.2V and 13.5V. Failure: Dropping below 13.2V or rising above 13.5V can interrupt the flash process and potentially damage the PCM.

Scan Tool Commands That Help

• wiTECH Diagnostic Application: Reprogram the PCM — This is the primary repair step to install the updated software that corrects the P1607 fault, as specified in multiple TSBs.
• wiTECH Diagnostic Application: Clear all DTCs — This function is automatically presented after a successful PCM flash and must be run to clear P1607 and any other codes set during the reprogramming event.
• AlfaOBD / wiTECH: Proxy Alignment — This is required if a *used* PCM is installed. It synchronizes the VIN and configuration data between the new PCM and other modules like the Body Control Module to prevent a VIN mismatch, which typically causes a flashing odometer.
• wiTECH 2.0: Restore Vehicle Configuration — Used after replacing a PCM to synchronize the VIN and option data from Chrysler's central records to the new module, ensuring all systems communicate correctly.

Wiring & Ground Locations

• G100 — Left front of the engine compartment, under the battery tray.. This is a primary chassis ground for the engine compartment harness, which includes circuits essential for stable PCM operation.
• G102 — Left rear of the engine, near the top of the block.. Provides a direct ground path for engine-mounted components and is part of the PCM's ground reference circuit.
• G103 — Left side of the engine compartment on the cowl/firewall.. This ground serves the Body Control Module (BCM) and Data Link Connector (DLC). A poor connection here can cause communication errors (like U0140) that may accompany P1607.
• G109 — Left side of the engine compartment on the wheel well.. Another critical chassis ground point for the engine harness that ensures stable voltage for all modules, including the PCM.
• PCM Connectors (C1/C2) — On the PCM, which is mounted to the firewall in the engine bay. The 2.4L model uses blue and green connectors.. These are the main interface for the PCM. All power, ground, and sensor signals pass through these connectors. They should be inspected for corrosion or pushed-out pins if the code persists after software and battery fixes.

Real Owner Repair Stories

• dodge-dart.org forum user (2013 Dodge Dart 2.4L) — Check Engine Light with codes P1607 and P2610.
  ❌ Tried (didn't work) Replacing the vehicle battery.
  ✅ What actually fixed it The owner took the vehicle to a Dodge dealership, which performed a PCM software update (reflash) as per the TSB. This permanently resolved both codes.
• YouTube channel 'FDT Motors' (2013-2016 Dodge Dart 2.4L) — Check Engine Light and flashing odometer after installing a used PCM.
  ❌ Tried (didn't work) Using a standard Autel scan tool, which could not perform the required function., Going to the dealer, who would only program a new PCM they sold for over $1,000.
  ✅ What actually fixed it The owner used an OBDLink MX+ adapter ($129) with the AlfaOBD software ($65) on a laptop to successfully run a 'Proxy Alignment'. This synchronized the used PCM with the car, stopped the odometer from flashing, and resolved the issue.

OEM Part Supersession History

• 4727370AA → 68053218AA (common replacement), 68223712AA, 68369406AA — Standard part evolution and consolidation across multiple vehicle platforms.
  Heads up: The original part number 4727370AA has been superseded by several other numbers. While many are interchangeable, always verify fitment for the specific 'PCM Power' or 'ASD' relay location in the fuse box, as Mopar used this style of relay for many different functions.
• 05150909AD (Generic number for 2015 2.4L PCM) → 68229510AA, 68229510AB, 68229510AC, 68229517AL — Hardware and software revisions throughout the model year.
  Heads up: When replacing a PCM, the part number must be an exact match or a verified superseded number for the vehicle's specific build date and options. Using an incorrect part number, even from another 2.4L Dart, can cause communication issues or a no-start condition.

Model Year Variations Within This Range

• 2013-2015: These model years are primarily covered by TSB #18-023-16 (and its revisions) for the P1607 software update. This TSB addresses a large bundle of codes simultaneously.
• 2016: The 2016 model year is covered by a separate bulletin, TSB #18-009-16 (and its revisions). While it also fixes P1607 with a software update, the specific software package and list of other corrected codes may differ slightly from the earlier TSB.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used PCM is a viable option *only if* you have access to the tools and knowledge to perform a 'Proxy Alignment' procedure. It can save hundreds of dollars compared to a new, dealer-supplied unit. For simple parts like the ASD/PCM relay, buying new is recommended as the cost is low and it eliminates a potential point of failure.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a used PCM, verify the part number is an exact match or a confirmed supersession for your vehicle.
• Ensure the donor vehicle was not involved in a flood or fire.
• Inspect the PCM's connectors for any bent, corroded, or pushed-out pins.
• Ask the seller if the VIN of the donor vehicle is available, as it can sometimes help with programming.

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

• Powertrain Control Module (PCM): While aftermarket 'remanufactured' PCMs are available, they can be hit-or-miss. A used OEM unit from a reputable salvage yard combined with proper programming is often more reliable than a non-OEM new unit. A new OEM unit from the dealer is the most reliable but most expensive option.

Aftermarket brands forum-validated for this vehicle:

• For the PCM/ASD relay: Standard Motor Products, Hella, and WVE/NTK are reputable aftermarket alternatives to Mopar.

Brands owners have reported issues with on this vehicle:

• Avoid unbranded, no-name electronic components like relays and especially PCMs from online marketplaces, as their quality control is often non-existent.

Real Owner Stories

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

Related OBD-II Codes

• P2610 — PCM Engine Off Timer Performance. This code is frequently seen with P1607 and is often resolved by the same PCM software update specified in the TSBs.
• P0335 — Crankshaft Position Sensor 'A' Circuit. The presence of this code alongside P1607 strongly indicates the need for the PCM reflash, as it is explicitly mentioned in TSBs #18-023-16 and #18-022-17.
• P0456 — Evaporative Emission System Leak Detected (Very Small Leak). This is one of many unrelated codes that Chrysler bundled into the software fix for TSB #18-023-16, which also corrects P1607.
• P050D — Cold Start Rough Idle. This code is also addressed by the PCM software update in TSB #18-023-16, which is the primary fix for P1607 on this vehicle.
• U0140 — Lost Communication With Body Control Module. This communication code is another of the various DTCs that the PCM reflash (TSB #18-023-16) is designed to fix, along with P1607.

Frequently Asked Questions