P0A59: Generator Current Sensor Circuit
What to do
Charging behaviour and engine starting are where this shows, more than acceleration. Signal wiring first; the sensor lives inside the inverter. Qualified workshop only.
What this code means
A current sensor watching the generator's phases has failed its circuit checks.
The P0A51 picture applies — measurement plus protection, sensors inside the inverter, wiring as the reachable suspect — pointed at the machine that charges the battery and starts the engine. The module responding cautiously here means charging held back and, on some vehicles, engine starting affected, since spinning the engine takes current this sensor can no longer vouch for.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Faulty motor current sensor · specialist
- Faulty power inverter · 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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