P0A18: Motor Torque Sensor Circuit Range/Performance
What to do
If other hybrid codes are stored alongside this one, make sure the workshop reads all of them — this code frequently describes the consequence of another fault rather than a fault of its own.
What this code means
The motor torque reading is electrically alive but implausible — inside its measurable range, outside what the commanded torque and the vehicle's behaviour say it should be.
This is the cross-check variant of P0A17: the disagreement code rather than the dead-circuit code. Because the torque value is computed from current and rotor position on most hybrids, a range/performance fault here often travels with a code from one of those families — and when it does, the companion code is the one doing the pointing. Diagnose the current or position fault first and this one usually leaves with it.
Likely causes
Start here
- Chafed harness between transaxle and inverter · moderate
- Corroded or loose connector · easy
Less common
- Faulty motor current sensor · specialist
- Faulty motor position sensor · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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