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2019 Outlander PHEV - Hybrid System Warning & Reduced Power

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Mike T. · rep 0 · May 25, 4:06 AM · 1 replies · solved · Question

Vehicle: 2019 Mitsubishi Outlander PHEV GT

Hey community,

My 2019 Mitsubishi Outlander PHEV GT, with around 60,000 miles, just threw a 'Hybrid System Service Required' warning on the dash, and I've noticed a significant reduction in power. It feels sluggish, especially when trying to accelerate, and the electric-only range seems to be much lower than usual. The car is still driving, but it's definitely not right.

I haven't hit any major potholes or had any recent service. What could cause a hybrid system warning and power loss on these PHEVs? Is it usually battery-related, or could it be something else like the inverter or motor system? I'm hoping it's not a huge repair.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:06 AM

0

ClearTheCode admin answer:

A 'Hybrid System Service Required' warning combined with reduced power on your 2019 Mitsubishi Outlander PHEV is a serious indication that the sophisticated hybrid powertrain is experiencing a fault. Given the complexity of these systems, professional diagnosis is essential.

Potential Causes:

  1. High Voltage Battery Issues:
    • Degradation/Failure: Individual cells or modules within the high-voltage battery pack can degrade or fail, leading to reduced capacity, power output, and triggering warnings.
    • Battery Management System (BMS) Fault: The BMS monitors the battery pack. A fault in the BMS itself can cause incorrect readings or control, leading to system warnings.
  2. Inverter/Converter Malfunction: The inverter converts DC power from the battery to AC for the electric motors, and the converter manages power flow. A fault in either of these critical components can severely impact power delivery and trigger system warnings.
  3. Electric Motor/Generator Issues: While less common, a fault in one of the electric drive motors or generators can lead to reduced power and system errors.
  4. Charging System Faults: Problems with the onboard charger or the high-voltage charging circuit can sometimes manifest as hybrid system warnings.
  5. Cooling System Issues: The high-voltage battery and power electronics require dedicated cooling. Overheating due to a fault in the cooling system can trigger warnings and reduce power to prevent damage.
  6. Software Glitch: Less frequently, a software anomaly in the Hybrid Control Unit (HCU) or other related ECUs can cause erroneous warnings.

What to Do:

  1. Avoid Prolonged Driving: If the vehicle is in a 'limp home' mode or has significantly reduced power, avoid driving it extensively to prevent further damage.
  2. Check for Diagnostic Trouble Codes (DTCs): A standard OBD-II scanner might pick up some generic powertrain codes, but a Mitsubishi-specific diagnostic tool will be able to access the hybrid system's proprietary codes, which are crucial for accurate diagnosis.
  3. Note Any Other Symptoms: Pay attention to any unusual noises, smells, or other warning lights that might appear.

When to See a Shop:

You should take your Outlander PHEV to a Mitsubishi dealership or a specialized hybrid repair shop immediately. Diagnosing hybrid system faults requires specialized training, tools, and safety precautions due to the high voltages involved. Attempting to diagnose or repair these systems yourself without proper knowledge is extremely dangerous. The shop will be able to read the specific fault codes, perform diagnostic tests on the battery, inverter, and motors, and determine the exact cause of the warning and power loss. Do not delay, as continued driving could potentially worsen the issue or lead to a complete breakdown.

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