Code
P0D39
Generic
P — Powertrain
Battery Charger A Input Current Sensor Circuit Range/Performance
AI status
Completed
Completed
100%
Causes
- Damaged or failed input current sensor (charger side)
- Open or short in sensor signal or supply wiring
- Corroded, loose or damaged connector(s) at the sensor or charger control module
- Poor sensor reference/ground or low supply voltage to sensor
- Faulty battery charger control module or internal electronics
- Intermittent wiring fault caused by chafing, water ingress or heat damage
Symptoms
- Charging system fault/warning lamp illuminated
- AC/DC charging disabled or limited charging current
- Battery state-of-charge not increasing as expected or slow charging
- Reduced vehicle driving range (EV/HEV) after charging attempt
- Inconsistent or no charger current displayed on vehicle info screen
- Intermittent charging faults or repeated DTCs after clearing
What to check
- Read and record DTC(s) and freeze frame data with a diagnostic tool
- Confirm vehicle-specific safety procedures for high-voltage systems before work
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or water intrusion
- Check for related DTCs (charger, battery current, voltage, CAN network)
- Backprobe sensor connector and verify reference supply voltage and ground continuity
- Compare measured sensor output at rest and under charge against expected values
Signal parameters
- Sensor supply/reference: commonly 5 V reference (check vehicle spec)
- Typical zero/idle output: often near mid-rail (≈2.5 V) for bidirectional sensors — vehicle specific
- Output varies proportionally with input current; full-scale commonly approaches 0–5 V (refer to service data)
- Expected CAN message values: charger input current should correlate with sensor voltage and battery current readings
- Allowable tolerance and exact voltage ranges are vehicle-specific — consult service documentation
Diagnostic algorithm
- Retrieve all related DTCs and freeze frame data; note operating conditions (HV present, charging on/off, ambient temp).
- Observe symptom while re-producing the condition: attempt a controlled charge while monitoring live data (input current, sensor voltage, charger status).
- Visually inspect sensor, connector seals, and wiring for damage, corrosion, or looseness. Repair any physical damage. Disconnect battery/disable HV per procedures before connector repairs.
- With vehicle safe and appropriate tools, backprobe sensor connector. With ignition/charger enabled, measure sensor supply/reference voltage and sensor output voltage. Compare to vehicle spec (typical: ~5 V supply, ~2.5 V at no current).
- Check continuity and resistance of signal and ground circuits to charger control module; look for shorts to battery, chassis, or other circuits.
- Perform wiggle and load tests while monitoring live data to find intermittent faults.
- If wiring and connector are good but sensor output is out of range, replace the input current sensor and test.
- If a new sensor does not correct the issue, test or replace the charger control module per manufacturer procedure and ensure correct programming/calibration.
- Clear DTCs, perform a full charging cycle and road/charge test to confirm repair. Re-scan for stored/returning codes.
Likely causes
- Failed input current sensor or sensor electronics
- Damaged/shorted signal wire or connector corrosion
- Poor ground or low reference/supply voltage to the sensor
- Faulty charger control module (less common)
Fault status
Status
Battery Charger A input current sensor signal out of range or performing outside expected parameters; charging may be limited or disabled.
Repair difficulty: Hard
Diagnostic time: 2.0-4.0 hours
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