2013 Sonata limited hybrid

Hello guys,

My 2013 Hyundai Sonata Hybrid Limited (VIN #KMHEC4A48DA088569) encountered a Hybrid error message “pull over don’t drive,” for the second time in three years. I towed it to a dealership where they initially replaced the hybrid switch, allowing the car to start but not fixing the issue. They diagnosed that it needed a Hybrid Power Control Unit (HPCU).

Seeking a second opinion, I towed it to another dealership, which confirmed the need for an HPCU and also suggested a transmission replacement, estimating over $10,000. Opting to handle repairs myself, I sourced used parts at a fraction of the cost:

  1. Hybrid Power Control Unit (HPCU) P/N#37513-E7000 - $150 from eBay
  2. Drive Motor Inverter P/N 36600-3D002 - $290 from eBay
  3. HSG (Hybrid Starter Generator) P/N#37390-2G920 - $100 from a salvage yard

After replacing these parts, I encountered error codes:

  • P0A78: History Drive motor A inverter performance
  • P0C17: Active Drive motor A position sensor not learned
  • P1C76: Active Generator position sensor not learned

I attempted to perform Motor/HSG resolver calibration using my Foxwell NT510 OBD2 tool, but it failed despite meeting all test conditions. When trying in neutral, the calibration fails immediately without engine noises or jerks.

Concerned that the transmission pump might be the culprit, I inspected it by removing the pump cover and checking its operation. However, the gears did not show any movement, suggesting the motor might not be turning.

Any insights or advice would be greatly appreciated as I aim to get my car, which has 200,850 miles and is otherwise in great shape, back on the road.

Thank you!


I’m now facing a dilemma. After replacing those parts and still encountering issues, I’m considering whether the problem might indeed be with the transmission, as suggested by the second dealership. However, before committing to such an expensive repair, I’d like to explore all possible options.

Has anyone experienced similar issues or have insights on the error codes P0A78, P0C17, and P1C76? Specifically, I’m interested in whether there are any specific troubleshooting steps or alternative diagnostics I should consider.

I’m also curious if there’s a more precise way to check the transmission pump operation or any other components that might be causing these problems.

Additionally, if anyone has experience using the Foxwell NT510 OBD2 tool for Motor/HSG resolver calibration, I’d appreciate any tips or insights on getting it to work.

I’m wondering if there’s a step or condition I’m missing that might be causing the calibration to fail.

Thanks in advance for any advice or guidance.