🟡 2024 Mazda CX-90 PHEV Preferred Review: e-Skyactiv 2.5L Plug-In Hybrid Analysis, Three Loss-of-Drive-Power Recalls, a Genuine Steering Recall & EV Integration.
2024 Mazda CX-90 PHEV Preferred (2.5L I4 Hybrid / Multi-Plate Wet Clutch / i-Activ AWD)
A comprehensive mechanical teardown of Mazda’s flagship three-row plug-in hybrid, evaluating its clean-sheet longitudinal platform, dual-clutch transmission characteristics, 17.8 kWh battery thermal management, a genuinely elevated recall count for this specific model year, and long-term shop maintenance.
Best For: Families wanting rear-biased handling, near-luxury three-row appointments, and 26 miles of daily EV commuting who are willing to confirm — by VIN, not just by service history summary — that all three loss-of-drive-power recalls and the steering worm gear recall have actually been completed.
💵 Pricing & Value Guidance
The Carmizer Sweet Spot: The 2024 Mazda CX-90 PHEV Preferred is the smart buy in the lineup. Jumping to higher trims adds cosmetic features like Nappa leather or panoramic sunroofs, but the Preferred retains the identical 323-hp plug-in powertrain and high-voltage battery capacity. You skip the steep top-trim depreciation while capturing full utility and tax credit / lease incentives — just don’t let the pre-owned discount distract from confirming recall completion, since this generation’s recall history is unusually heavy for a first model year.
Key Specifications
Deep Mechanical Breakdown & Shop Floor Reality
Mazda abandoned the transverse layout entirely for the CX-90, building a brand-new longitudinal architecture designed to handle heavy torque loads and rear-biased handling. The powertrain integrates a naturally aspirated 2.5L four-cylinder engine with a powerful electric motor sandwiched right before a torque-converter-less 8-speed automatic transmission. This mechanical setup delivers crisp throttle response and exceptional weight distribution.
- Multi-Plate Wet Clutch Transmission: Replaces a traditional torque converter with an electronically controlled hydraulic wet clutch pack. This allows for instantaneous power application from the electric motor while maintaining physical gear-set directness.
- Longitudinal Layout & Kinematic Posture Control: Mounting the engine north-south optimizes front-to-rear weight balance, while KPC applies subtle braking to the inner rear wheel during high-speed cornering to pull the chassis flat and eliminate body roll.
- Dedicated Hybrid Thermal Loops: Features independent cooling circuits for the inverter, electric motor, high-voltage battery pack, and internal combustion engine to prevent thermal degradation during heavy towing or sustained highway runs.
• Wet Clutch Low-Speed Engagement: Without a torque converter to cushion off-the-line slip, early software calibrations can produce slight stutters or delayed engagement when rolling away from a stoplight in heavy traffic.
• Engine Bay Packaging Density: While longitudinal packaging provides good side access, the bellhousing and electric motor interface area is tightly packed. Coolant hose routing for the hybrid electronics requires patience during service.
• Fuel Quality Sensitivity: While the 2.5L will run on regular 87 octane, generating the advertised 323 hp and 369 lb-ft of torque requires 91+ octane. Running cheap fuel under heavy throttle can trigger knock sensor retard.
• High-Voltage Battery Heater Sink Defect (TSB 07-006/24): PHEVs built before May 8, 2024 can trigger a hybrid abnormality warning tied to a manufacturing defect in the high-voltage battery water heater’s heat sink (DTC P0AA6:00). Repair requires opening the HV battery compartment to replace the heat sink assembly — worth asking about specifically if the build date falls in that window.
📋 Factory Recalls, TSBs & Known Bulletins
Issue: A software error can cause the gasoline engine and electric motor to shut down unexpectedly, resulting in a loss of drive power.
Fix: Dealer reprogram of the Powertrain Control Module (PCM) and Engine Control Module (ECM), free of charge.
Issue: Improper inverter software can activate a fail-safe mode that limits motor power while driving in EV mode, illuminating warning lights and sounding a chime. This same campaign bundle also covers a separate i-stop engine-restart failure and an additional PCM/ECM/TCM power-loss issue.
Fix: Dealer reprograms the inverter (SGC2/DMCM), PCM, ECM, and TCM, free of charge.
Issue: An assembly defect in the steering worm gear spring may result in a sudden loss of power steering assist — owners have reported a “notchy” or “locked” feeling, particularly when turning back to center after a sustained curve.
Fix: Dealers replace the worm gear spring and reapply grease to the gear teeth, free of charge. Confirm this specific campaign shows completed by VIN — a loss of power steering assist while driving is a genuine safety issue, not a comfort complaint.
Issue: During startup, the defroster, seatbelt warning, 360° view monitor, and — notably — the PHEV high-voltage battery cooling system may fail to function properly.
Fix: Dealer reprograms the Dash ESU with improved software, free of charge.
Worth Noting: This is a genuinely heavy recall load for one model year — four separate campaigns, two of which involve real loss-of-drive-power scenarios. Independent complaint trackers also flag 2024 as the CX-90’s worst model year by complaint volume, with steering complaints alone accounting for roughly a quarter of all reports (median mileage at complaint: ~16,000 miles). Don’t assume a car is clean because “the recalls got done” in a vague sense — check each campaign individually by VIN at NHTSA.gov.
Stoplight Reliability & Watchpoint System
- Skyactiv-G 2.5L Engine: The naturally aspirated four-cylinder core is exceptionally well-proven, avoiding turbocharger heat stress and carbon-clogging issues.
- Brake Pad Wear Lifespan: Regenerative braking handles the vast majority of standard deceleration, extending friction brake pad life well past 60,000 miles.
- Chassis Corrosion Resistance: Excellent underbody sealing, robust frame stampings, and high-strength steel subframe structures.
- Wet Clutch Transmission Hardware: Brand-new in-house design. While physical durability appears solid, long-term clutch pack wear behavior past 100k miles remains unproven.
- Heavy Curb Weight Tire Wear: Weighing over 5,200 lbs, the heavy chassis eats through factory tires noticeably faster than lighter crossovers.
- HV Battery Heater Sink (Early Builds): Vehicles built before May 8, 2024 carry a documented defect risk in the battery heater’s heat sink assembly — see TSB 07-006/24 above.
- 12V Auxiliary Battery Drain: Early models can suffer from auxiliary battery voltage drops if left parked for extended periods while connected to smart features.
- Unconfirmed Loss-of-Drive-Power Recalls: Two separate real-world recalls (6323J and 7024J) involve the engine and/or electric motor unexpectedly shutting down while driving. Do not treat this car as safe until both show completed by VIN — this is not a comfort or convenience issue.
- Unconfirmed Steering Worm Gear Recall: A defective worm gear spring can cause sudden loss of power steering assist. This is a hardware recall (24V022000), not a software tweak — verify completion before driving the vehicle, let alone buying it.
- Assuming First-Year Recalls Are “Normal”: Four separate recall campaigns on one model year, two involving loss of drive power, is meaningfully above typical first-year teething — treat this as a specific due-diligence item, not background noise.
OBD-II Diagnostic Targets
💸 Repair & Maintenance Costs
- Full Synthetic Oil Service (0W-20 + Filter): $80 – $100 (Annual minimum)
- Wet Clutch Transmission Fluid Exchange: $300 – $400
- Hybrid Coolant Loop Flush: $200 – $300
- Replacement Heavy-Duty Tires (Set of 4): $1,100 – $1,400
🔍 Pre-Purchase Checklist
- Check the VIN at NHTSA.gov and confirm all four recall campaigns individually — 6323J, 7024J, 24V022000 (steering), and 7124J (dash ESU) — show as completed, not just “recall work performed” in general.
- Test drive in stop-and-go traffic (10–25 mph) to evaluate wet clutch engagement and smooth transitions between pure EV and gas engine operation.
- Plug the vehicle into a Level 2 charger during inspection to confirm the onboard charger and high-voltage port accept charge without faults.
- Verify steering feel at highway speeds and through a sustained curve back to center — a “notchy” or “locked” feeling is the specific symptom tied to the worm gear recall.
- If the build date is before May 8, 2024, ask specifically whether TSB 07-006/24 (HV battery heater heat sink) has been addressed.
This pattern — a loss-of-drive-power defect serious enough to warrant multiple recall campaigns — isn’t unique to Mazda. We’ve tracked similar sagas across the industry in 2025’s Biggest Vehicle Recalls.
📌 The Carmizer Bottom Line
The 2024 Mazda CX-90 PHEV Preferred brings rear-biased longitudinal handling, upscale cabin appointments, and 26 miles of daily electric range to the three-row crossover segment — the underlying mechanical combination of a proven Skyactiv-G engine and robust electric drive components is genuinely strong. But this is not a car to buy on curb appeal or a vague “recalls handled” assurance from a seller: four separate recall campaigns hit this model year, two of them involving real loss-of-drive-power scenarios and one a hardware steering defect. Verify each campaign individually by VIN, keep up with fluid services, and feed it premium fuel, and this remains a sharp-handling family hauler worth owning — the recall history just demands more diligence at the point of purchase than most first-year vehicles.