P0D53: Battery Charger Hybrid/EV Battery Output Current Sensor Circuit Low
What to do
Charging will be slow or will not start. The predicted range may also be wrong for a while afterwards, even once the fault is fixed, until the car has completed a full charge to recalibrate.
What this code means
The circuit for the sensor measuring the charger's high voltage output current is faulty.
This is the sensor that sets how fast the car charges, because in the constant-current phase — most of a charge — current is the quantity being controlled and everything else follows from it.
It is also half of the pack's fuel gauge. State of charge on a traction battery is counted rather than measured: the module integrates current in and out over time, because a lithium pack's voltage barely moves across most of its usable range and cannot be read like a fuel level. The argument is set out at P0B0E. A charging current that is mismeasured therefore does not just charge at the wrong rate — it teaches the car a wrong state of charge, and the range estimate stays wrong afterwards until the pack is next fully charged or fully depleted.
That lingering effect is worth knowing, because a car whose range prediction went strange after a charging fault has not necessarily got two problems.
The signal is at or below its lower limit — usually a short to earth, or an open in the sensor's supply.
Likely causes
Start here
- Faulty on-board charger · specialist
- Corroded or loose connector · specialist
Less common
- Faulty battery pack sensor module · specialist
- Open circuit in sensor wiring · specialist
- Damaged wiring harness · 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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