2022 Kia EV6

Kia EV6 P0C46 Front Motor Stator Overheat — Clogged Coolant Strainer

P0C46 C1AC100 Published 2024-11-22 Updated 2024-11-22
Kia EV6 P0C46 motor overheat coolant strainer thermal management E-GMP

2022 Kia EV6 AWD presented with front motor power reduction after 15-20 minutes of spirited driving. P0C46 stored. Coolant system appeared normal. Root cause was a partially clogged coolant strainer on the front motor cooling circuit reducing flow by 60%.

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The Problem
2022 Kia EV6 GT-Line AWD (44,200 miles) brought in after customer noticed significant power loss from front motor after sustained performance driving. 'Motor Temperature High — Performance Limited' appeared on cluster. Fault cleared after 25-minute rest. P0C46 (Electric Motor Stator Winding Overtemperature) stored against front motor.
Diagnostic Procedure
  1. 1. Confirm P0C46 front motor. Rear motor clear. Coolant reservoir full, no external leaks.
  2. 2. Monitor front motor coolant flow. Coolant pump running, but flow rate measurement at front motor inlet appears reduced.
  3. 3. Measure coolant temperature delta across front motor during load test. Inlet 31°C, outlet 74°C — 43°C delta. Rear motor delta: 18°C. Front motor is getting significantly less coolant flow than rear.
  4. 4. Inspect front motor cooling circuit. Kia E-GMP has an inline coolant strainer on the front motor circuit (serviceable filter, often overlooked in maintenance). Remove and inspect strainer.
  5. 5. Strainer 65% blocked with fine metallic particles from normal motor bearing wear over 44,000 miles — no abnormal wear, just accumulated debris.
  6. 6. Clean strainer with compressed air and rinse. Reinstall. Coolant flow audibly increases immediately.
  7. 7. Repeat load test: front motor inlet-to-outlet delta now 19°C. Matches rear motor.
  8. 8. 30-minute performance drive simulation. P0C46 does not return.
Resolution & Root Cause
Coolant strainer cleaned. Front motor thermal management restored. No further overtemperature events.
💡 Key Lesson
Kia EV6 AWD (E-GMP platform) has a serviceable inline coolant strainer on the front motor circuit that accumulates metallic debris over time. It is not in most maintenance schedules but should be inspected from 40,000 miles onward. P0C46 front motor only, with normal coolant level and a large inlet-to-outlet temperature delta, is the diagnostic signature.
About This Case

This case was solved remotely by an HVDesk specialist with 15+ years of hands-on experience across major EV platforms including Tesla, Hyundai/Kia, Volkswagen ID series, BMW i-series, and Ford EVs. The procedure was provided as structured remote support to an independent auto repair shop.