2017-2026 Chrysler Pacifica Hybrid Power Inverter Module: Failure Symptoms & Replacement Guide

What is the Power Inverter Module and What Does It Do?

The Power Inverter Module (PIM) is a critical component found only in the Chrysler Pacifica Plug-In Hybrid (PHEV) models. It is not a simple power converter; it's a highly complex piece of electronics that acts as the central hub for the vehicle's entire high-voltage electrical system. Think of it as the command center for the hybrid drivetrain.

Its main jobs are:

• Inverting: Converting high-voltage DC power from the main battery pack into three-phase AC power to run the electric drive motors.
• Charging: Managing the flow of electricity from a charging station into the high-voltage battery.
• Regenerating: Capturing kinetic energy during braking, converting it from AC back to DC, and sending it to the battery.
• System Management: The PIM also communicates with numerous other modules in the vehicle, from the engine controller to the battery controller, to ensure smooth and efficient operation.

Common Symptoms of a Failing Pacifica Hybrid Inverter

A failing Power Inverter Module can cause a variety of symptoms, many of which can be alarming and leave the vehicle undrivable. Owners most commonly report a sudden loss of power while driving.

• "Service Hybrid Electric Vehicle System" Warning: This is the most common message that appears on the dashboard when the PIM detects a fault.
• Sudden Loss of Power: The vehicle may suddenly lose all acceleration and coast to a stop, sometimes accompanied by a "Stop safely, vehicle will shut off soon" message. This is a significant safety concern.
• No-Start or Won't Enter "Ready" Mode: The vehicle may refuse to power on or enter the "Ready to Drive" state. The PIM must be fully functional for the high-voltage system to activate.
• Inability to Charge: If the charging portion of the PIM fails, the vehicle will not be able to charge its high-voltage battery when plugged in.
• Check Engine Light with DTCs: A failing PIM will almost always trigger a check engine light and store Diagnostic Trouble Codes (DTCs). Common codes include P0A78 (Drive Motor "A" Inverter Performance), which directly points to an inverter issue. 🎬 See a breakdown of P0A78 symptoms and the eventual fix Other related codes might involve communication errors or specific circuit faults within the hybrid system.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

The Pacifica Hybrid's PIM has been the subject of several recalls and TSBs. Understanding these is crucial for diagnosis and repair.

Recalls

• NHTSA Campaign Number 17V371000 (Chrysler Recall T34): This early recall addressed PIMs on 2017-2018 models that could fail due to an overvoltage condition, causing a sudden loss of motive power. The fix involved reprogramming several modules and, in some cases, replacing the PIM itself.
• NHTSA Campaign Number 23V010000 (Chrysler Recall 03A): 🎬 Watch: How a wiring short triggers the propulsion system warning Affecting a wide range of 2017-2023 models, this recall was for an unexpected engine shutdown caused by a short circuit in an internal transmission wiring connector. While not a direct PIM failure, the remedy involves updating the PIM software to make it less sensitive to voltage flickers from the connector, preventing false shutdowns.
• NHTSA Campaign Number 22V436 (Chrysler Recall Z48): This recall was for a fire risk originating in the high-voltage battery pack of 2017-2018 models, not the PIM. However, symptoms could be confusing, so it's important context for anyone diagnosing a non-functional hybrid system.

Buying a Used Power Inverter Module: A Buyer's Guide

Given the high cost of a new PIM, a used OEM unit can be a cost-effective solution. However, this is a complex electronic part, and buyers must be cautious.

1. Verify the Part Number

This is the most critical step. Part numbers for the PIM have been revised many times. You must match the part number exactly or confirm that the number you are buying is a direct, official supersession for the original part in your vehicle. Using an incompatible PIM will not work. A list of known part numbers and their revisions can be found on Mopar parts websites.

2. Inspect the Physical Condition

When the part arrives, inspect it thoroughly:

• Connectors: Look at all electrical connectors. The pins should be straight, clean, and free of any corrosion or signs of overheating (discoloration, melted plastic).
• Housing: Check the aluminum housing for any cracks, deep gouges, or signs of being dropped.
• Coolant Ports: The PIM is liquid-cooled. Ensure the coolant inlet and outlet ports are clean, undamaged, and free of debris.

3. Check the Donor Vehicle Information

If possible, get the VIN and mileage from the vehicle the part was removed from. A part from a lower-mileage, newer vehicle is always preferable. This also helps in verifying compatibility.

4. Buy From a Reputable Source

Purchase from an established recycler that offers a warranty. Even a 30- or 90-day warranty provides crucial protection, giving you time to have the part installed and confirm it works correctly. A part that is "untested" or sold "as-is" is a major gamble.

5. Factor in Programming Costs

A used PIM is not a plug-and-play part. It must be programmed to your vehicle's VIN by a Chrysler dealership or a qualified independent shop with the proper scan tools and software subscriptions. This process, often called "security data transfer," is essential for the module to communicate with the rest of the vehicle. Failure to program the module will result in a no-start condition.

Cost to Replace the Chrysler Pacifica Power Inverter Module

Replacing the PIM is an expensive repair, which is why a used OEM part is an attractive option.

(Prices are estimates as of late 2025/early 2026 and can vary by region and supplier.)

Replacement Difficulty & Procedure Overview

• Difficulty Rating: 5 out of 5 (Professional Technician Recommended)
• Estimated Time: 4-6 hours
• DIY Feasible: No

The general replacement process involves:

1. Performing the high-voltage system power-down procedure.
2. Disconnecting the 12V battery.
3. Gaining access to the PIM, which is located in the engine bay.
4. Draining the specific cooling system loop for the power electronics.
5. Disconnecting multiple low- and high-voltage electrical connectors and coolant hoses.
6. Removing the old PIM and installing the new one.
7. Reconnecting all hoses and connectors, then refilling and bleeding the cooling system.
8. Performing the high-voltage system power-up procedure.
9. Programming the new module to the vehicle using a factory scan tool. This step is mandatory.

Frequently Asked Questions (FAQ)

OEM Part Numbers

The following is a list of known OEM part numbers for the Power Inverter Module. Part numbers are frequently superseded, so always confirm compatibility with a dealer or parts specialist using the vehicle's VIN. The latest part number often incorporates improvements over older versions.

Known Part Numbers Include: 68381781AD, 68381781AC, 68381781AB, 68381781AA, 05185115AF, 05190239AM, 68413465AB, and many others.