What it means
The input current sensor of battery charger B reports a circuit range/performance condition. Charging current measurement is unreliable.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery charger B's input current sensor measures current entering that charger so the control module can assess charging. P2D85 sets when the reading is within the electrical range but does not track the expected current behavior, suggesting sensor drift, an offset, or interference.
Common causes
Most likely first.
- Current sensor characteristic drifted
- Magnetic offset from nearby ferrous parts
- Sensor element aged beyond calibration window
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Save freeze-frame data and compare charger B's reported input current with charging state and rate to identify when the readings diverge.
- Inspect the sensor and its mounting area for displaced parts or nearby ferrous material that could affect its magnetic measurement.
- Check charger B's sensor connector and harness for damage, poor seating, or signs that the sensor has shifted from its intended position.
- Compare the sensor reading with an independent current measurement across relevant charging conditions using the manufacturer's procedure.
- If installation and wiring are correct but the readings remain inconsistent, assess the sensor for characteristic drift or age-related calibration error.
Common fixes
- Correct sensor placement or remove unintended nearby magnetic or ferrous interference, where applicable.
- Secure or repair a loose or damaged sensor connector and harness.
- Replace the input current sensor if its readings remain out of correlation with measured current.
- Have the charger control software checked for an applicable update using vehicle-specific service information.
Can I keep driving?
Charging may be slow, interrupted, or unavailable while the current measurement is unreliable. Avoid depending on charger B for a time-critical charge until the fault is resolved.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.