P1744: Hyundai Hybrid Engine Clutch System Performance
Severity: high
What it means: A Hyundai hybrid code. A dealer printout an owner shared described it as 'transmission engine clutch system performance.' On these hybrids, a clutch connects or disconnects the gas engine from the electric drive, and the computer sees it isn't working as expected.
Safe to drive? Not reliably. Owners with this code saw 'Check hybrid system' and a car that wouldn't move after stopping. Get it diagnosed soon.
Common symptoms
- 'Check hybrid system' warning
- Car won't move after coming to a stop
- Many warning lights at once
- May show up with knock sensor or other engine codes
Likely causes, ranked
- Engine clutch or its hydraulic control in the hybrid transmissionShop
- Engine problem the hybrid system reacts toShop
- Weak 12V battery or bad groundDIY
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Vehicle-specific notes
- 2011–2019 Hyundai Sonata Hybrid: A 2016 Sonata Hybrid owner whose car wouldn't move after stopping had history codes P1744 and P1326 plus C135B08 after many dealer visits. Read the full answer · Source
DIY or shop?
Shop for the hybrid diagnosis. Testing the 12V battery and ground cables is DIY.
Before you replace parts
- Get a full scan of the hybrid, engine and transmission modules and keep the printout.
- Test the 12V battery and check the ground cables.
- Check your VIN for recalls and hybrid warranty coverage.
- Ask the dealer to open a case with Hyundai if the problem keeps coming back.
Safety / mechanic note
A car that won't move after stopping can strand you in traffic. Verify with a mechanic. A code points to a system, not always a specific part.
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