P1607 on 2014-2016 Jeep Cherokee 2.4L: PCM Shutdown Timer Fixes

What's Unique About the 2014-2016 Jeep Cherokee

Unlike many vehicles where a PCM internal error code suggests a failed computer, on this specific Jeep Cherokee, P1607 is a well-documented software glitch. Chrysler (Jeep's parent company) has issued multiple Technical Service Bulletins (TSBs), including 18-014-16 and its successor 18-014-17, acknowledging this issue and instructing dealers to resolve it by reprogramming the PCM with updated software, not by replacing hardware. This issue is also common on other FCA products from the same era that use the 2.4L engine, such as the Chrysler 200, Dodge Dart, and Ram ProMaster City.

Symptoms You May Notice

• Check Engine Light is on
• Engine may stall, especially when coming to a stop
• Hard starting or no-start condition
• Rough or erratic idle
• Engine or transmission feels like it 'skips' while driving.
• Harsh or unusual transmission shifting.
• RPM flare on a cold start.

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability This is a known software bug from the factory, as documented in multiple manufacturer TSBs (e.g., 18-014-16, 18-004-16, 18-014-17). The original software had flawed logic for its internal timers.
   How to confirm: A Jeep dealer or a shop with a wiTECH scan tool can check the current software calibration ID in the PCM and compare it to the latest version available from the manufacturer. The presence of P1607 along with P2610 is a very strong indicator.
   Typical fix: Reprogram (reflash) the PCM with the latest software version. Per the TSBs, the Transmission Control Module (TCM) must also be updated at the same time. A battery charger must be connected during the procedure to ensure stable voltage.
   Est. part cost: $0
2. Weak or Failing Battery 🟡 Medium Probability FCA electrical systems of this era are sensitive to voltage. Low system voltage during the engine shutdown sequence can corrupt the PCM's timer logic, causing it to set rationality codes like P1607.
   How to confirm: Test the battery with a digital multimeter or an electronic battery tester. A healthy battery should show approximately 12.6 volts with the engine off and 13.5-14.5 volts with the engine running. Many auto parts stores offer this service for free.
   Typical fix: Replace the vehicle's battery and ensure terminals are clean and tight.
   Est. part cost: $150-$250
3. Faulty Engine Coolant Temperature (ECT) Sensor ⚪ Low Probability
   How to confirm: Monitor the ECT sensor data on a scan tool to see if it provides a logical reading as the engine warms up and cools down. A faulty sensor might give a fixed reading or jump erratically. Resistance should be ~2000-3000 Ω at 20°C (68°F) and ~200-300 Ω at 90°C (194°F).
   Typical fix: Replace the ECT sensor. The OEM part number for the 2.4L engine is 5149077AB.
   Est. part cost: $20-$50

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): Actual hardware failure of the PCM is very rare for this specific code. This should only be considered after the software has been updated and all other potential causes (battery, wiring, relays) have been ruled out. A replacement PCM can cost over $800 plus programming.
• Corroded PCM Power Relay: In some related FCA vehicles, a corroded PCM power relay (often in the under-hood fuse box) has been found to cause intermittent power issues that trigger a P1607 code. This is a low-cost item to inspect and replace before considering PCM replacement.

Diagnosis Steps

1. Verify the battery and charging system are healthy. Test battery voltage with the engine off (should be ~12.6V) and running (should be 13.5V-14.5V). A weak battery can cause numerous electrical issues on this platform.
2. Scan for all DTCs. Note if P1607 is accompanied by a cluster of other codes like P2610, U0402, P0456, or P0335. This strongly suggests the TSB-related software issue.
3. Contact a Jeep dealership with your Vehicle Identification Number (VIN) and ask if TSB 18-014-16, 18-004-16, or the superseding TSB 18-014-17 apply to your vehicle and if the software update has been performed.
4. If the software is outdated, the primary repair is to have the dealer or a qualified shop reprogram the PCM and TCM with the latest software using a wiTECH tool. Ensure a battery maintainer is used during the flash process.
5. After the update, clear all codes and perform a drive cycle to confirm the fix.
6. If the code returns after the software update, inspect the PCM power relay in the under-hood fuse box for corrosion or damage. Consider swapping it with a known-good relay as a test.
7. If the relay is good, investigate the Engine Coolant Temperature (ECT) sensor for proper operation using a scan tool to monitor its live data.
8. As a last resort, after all other steps have failed, inspect the wiring and connectors for the PCM for any signs of damage or corrosion before considering PCM replacement.

Parts You'll Likely Need

• Powertrain Control Module Software Update — This is a known software bug, and the official fix from the manufacturer is a software reflash, not a hardware replacement.
  Trusted brands: Mopar (via dealership service)
  OEM price range: $100-$250
  Aftermarket price range: N/A

Related Codes That Often Appear With This One

• P2610 — P2610 is 'PCM Internal Engine Off Timer Performance'. It is a very similar code that points to the same internal timer issue and is often listed in the same TSBs to be resolved by the same PCM software update.
• U0402 — 'Implausible Data Received From TCM'. The TSBs for the P1607 fix often require the Transmission Control Module (TCM) to be updated at the same time, indicating a related software communication issue that can affect shifting.
• P0116 — 'Engine Coolant Temperature Sensor 1 Performance'. Since the PCM uses the ECT sensor to validate its shutdown timer, a software bug can cause faults related to this sensor's performance. This code is also listed in the TSBs.
• P0456 — 'EVAP System Small Leak'. This code is also listed in the TSBs as being potentially resolved by the PCM software update, suggesting the timer rationality affects other diagnostic monitors.
• P0335 — 'Crankshaft Position Sensor Circuit'. This code is frequently mentioned in the same TSBs for the 2.4L engine, indicating the software update also corrects false reporting of this sensor's failure.
• P0133 — 'O2 Sensor 1/1 Slow Response'. TSB 18-014-16 REV. A lists this code as another that can be resolved by the PCM reflash, showing how widespread the software glitches were.

Technical Service Bulletins (TSBs) & Recalls

• 18-014-16 REV. A: 'Flash: 2.4L Powertrain Diagnostic And System Improvements' for 2016 models. Lists P1607 and a host of other codes fixed by a PCM reflash.
• 18-004-16: 'Flash: 2.4L Powertrain Diagnostic And System Improvements' for 2014-2015 models.
• 18-014-17: Supersedes TSB 18-004-16 for 2014-2015 models, providing updated software to fix P1607 and other DTCs.

Platform-Specific Known Issues

• This vehicle is subject to multiple Technical Service Bulletins (TSBs) for this specific code, which instruct dealers to update the PCM software. Key TSBs include 18-014-16, 18-004-16, and the superseding TSB 18-014-17.
• The software update for the Powertrain Control Module (PCM) must be performed along with an update for the Transmission Control Module (TCM) to fully resolve all related symptoms, such as poor shift quality.

Mechanic-Grade Diagnostic Values

• Engine Coolant Temperature (ECT) Sensor Resistance — expected: ~2000-3000 Ω at 20°C (68°F) and ~200-300 Ω at 90°C (194°F). Failure: Readings significantly outside the expected range for a given temperature, or an open/short circuit.
• Engine Coolant Temperature (ECT) Sensor Signal Voltage — expected: Approximately 2.0V - 3.0V on a cold engine, dropping to around 0.5V when the engine is fully warmed up.. Failure: Voltage that is stuck high or low, or does not correspond logically to the engine's actual temperature.
• Battery Voltage (During Flash Process) — expected: Must not drop below 13.2 volts and should not climb above 13.5 volts.. Failure: Voltage outside this stable range can cause the PCM/TCM reflash to fail or be interrupted.

Scan Tool Commands That Help

• wiTECH 2.0: Reprogram PCM / Flash PCM — This is the primary repair procedure specified by manufacturer TSBs to fix the P1607 software glitch.
• wiTECH 2.0: Reprogram TCM / Flash TCM — The TSBs for P1607 require the TCM to be updated at the same time as the PCM to ensure complete resolution of all symptoms, including shift quality issues.
• wiTECH 2.0: PROXI Configuration Alignment — This routine must be performed after reprogramming modules to ensure all vehicle modules are communicating correctly on the network.
• wiTECH 2.0: VIN Verification — This function is used after module programming to write or verify the vehicle's VIN in the new software.
• wiTECH 2.0: Restore Vehicle Configuration — Used after installing a new or blank PCM to write the vehicle's original VIN and other configuration data, ensuring all options function correctly.

Wiring & Ground Locations

• PCM Power Fuses — In the under-hood fuse box (Power Distribution Center), located on the driver's side of the engine bay. Specific fuses include F13, F16, F30, and F83.. These fuses supply ignition and battery power to the PCM. A blown fuse will prevent the PCM from powering up correctly, which can lead to various codes, including internal timer faults.
• PCM Power Relays — In the under-hood fuse box. Key relays are K9, K10, K11, K12, and K13, which control power distribution to the PCM and related systems like the ASD (Auto Shutdown) relay.. A faulty or corroded relay can cause intermittent power loss to the PCM, disrupting its internal timers and setting a P1607 code. This is a known issue on related FCA vehicles.
• Engine Block Ground (G103 equivalent) — On the passenger side of the engine block. A main battery ground cable connects here.. This is a primary ground for the PCM and multiple sensors. A poor connection here can cause unstable voltage references for the entire engine management system, leading to rationality codes.
• Chassis Ground (G101 equivalent) — On the passenger side inner fender, near the front, behind the headlight assembly.. This is the main battery-to-chassis ground. Corrosion or a loose connection here can affect the entire vehicle's electrical system stability.

Real Owner Repair Stories

• YouTube user comment on 'How to Fix Code P1607' (2010 Dodge Journey SE (Related FCA vehicle with similar electrical architecture)) — Check Engine Light with code P1607 'PCM shutdown timer'.
  ❌ Tried (didn't work) Initial diagnosis pointed towards a faulty PCM.
  ✅ What actually fixed it The problem was a faulty PCM power relay (K5 in that vehicle's fuse box). Replacing the $14 relay and the associated fuse resolved the P1607 code without needing to replace the PCM.

OEM Part Supersession History

• TSB 18-004-16 REV. A → TSB 18-014-17 — Updated software with fixes for additional DTCs and improved system performance.
  Heads up: Applies to 2014-2015 model year Cherokees. The newer TSB (18-014-17) should always be used.
• TSB 18-014-16 REV. A → TSB 18-018-17 — Updated software with fixes for additional DTCs and software improvements.
  Heads up: Applies to 2016 model year Cherokees. The newer TSB (18-018-17) should always be used.
• 5149096AB → 5149077AB — Part number update for the Engine Coolant Temperature (ECT) sensor.
  Heads up: Both parts are likely compatible, but 5149077AB is the current specified Mopar part number for the 2.4L engine.

Model Year Variations Within This Range

• 2014-2015: The primary TSB for the P1607 software fix was originally 18-004-16, which was later superseded by 18-014-17.
• 2016: The TSB for the P1607 software fix is 18-014-16 (later superseded by 18-018-17), which is specific to this model year.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used Powertrain Control Module (PCM) from a junkyard can be a cost-effective alternative to a new unit IF actual hardware failure is confirmed. However, it is not a simple plug-and-play swap.

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

What to inspect on the donor part:

• Ensure the donor vehicle has the exact same engine (2.4L MultiAir) and model year range.
• Check for any signs of water intrusion, corrosion, or physical damage on the PCM casing and connectors.
• Obtain the VIN of the donor vehicle if possible, as it is required for reprogramming.

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

• Powertrain Control Module (PCM) Software Update: This is a service, not a part, and can only be performed by a dealer or a shop with a Mopar wiTECH subscription.
• Powertrain Control Module (PCM): While a used unit can be sourced, it MUST be reprogrammed by a professional with dealership-level tools (wiTECH) or advanced aftermarket tools (e.g., AlfaOBD with a secure gateway bypass). The vehicle's VIN and security information (SKIM) must be written to the used module.

Aftermarket brands forum-validated for this vehicle:

• For a replacement battery, brands like Interstate, DieHard, and Odyssey are frequently recommended on forums for their reliability in sensitive FCA vehicles.

Brands owners have reported issues with on this vehicle:

• Avoid generic, unbranded PCM power relays. Use a reputable brand like Standard Motor Products (SMP) or a direct OEM replacement if the relay is suspected to be faulty.

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 — ECM/PCM Internal Engine Off Timer Performance. This code often appears directly with P1607 and is a very strong indicator that the root cause is the PCM software bug addressed by the TSBs.
• U0402 — Invalid Data Received From TCM. This can be set alongside P1607 as part of the same software issue, which is why the TSBs require updating both the PCM and TCM.
• P0456 — EVAP System Small Leak Detected. This code is listed in the TSBs as one of several DTCs that can be falsely set due to the same PCM software glitch that causes P1607.
• P0335 — Crankshaft Position Sensor 'A' Circuit. Can appear with P1607 as part of a cluster of codes caused by the PCM software flaw described in TSBs 18-014-16 and 18-014-17.

Frequently Asked Questions