P2D84

Code

Generic P — Powertrain

Battery Charger B Input Current Sensor Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 29 RU: 27

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Page language: EN

Causes

Battery Charger B input current sensor (Hall-effect or shunt/transducer) failure
Sensor circuit shorted to battery positive or other high voltage source
Open or short in sensor wiring harness or damaged insulation
Poor or missing sensor ground or reference voltage (ratiometric 5V supply)
Corroded/contaminated or loose connector at sensor or charger
Faulty charger module (control electronics) or internal connector

Symptoms

DTC P2D84 stored and MIL/charge-system warning displayed
Reduced or disabled charging from Battery Charger B
Slow charging or inability to charge at normal rate
Possible reduced vehicle EV/HV performance or limp functionality
Unusual battery or connector heating under charge
Intermittent charging faults if wiring/connector is intermittent

What to check

Read freeze-frame and live data with a capable scan tool (verify sensor PID values)
Visually inspect sensor, connector, and harness for damage, corrosion, water intrusion
Check fuses, relays, and power feeds to charger module
Backprobe sensor connector for reference 5V (or specified ref), sensor output, and ground
Measure sensor output voltage at rest and during charging using DVOM or oscilloscope
Measure actual charging current with a clamp meter on the high-voltage feed to verify real current

Signal parameters

Sensor output typically ratiometric (0–5 V) or centered (~2.5 V at 0 A) for Hall-effect sensors; consult service manual for exact behavior
Expected: ~2.5 V at zero current (typical) with voltage rising or falling proportional to current depending on sensor type
High-level fault threshold commonly near the supply rail (e.g., >4.5 V) or outside manufacturer-specified range — consult OEM spec
Reference supply typically 5 V (regulated) and sensor ground near 0 V; any deviation can cause erroneous high output
Actual charge current depends on vehicle; verify with clamp meter and compare to sensor-derived value

Diagnostic algorithm

Safety first: follow HV safety procedures. Only qualified technicians should work on HV charging systems.
Connect an OEM-capable scan tool. Record freeze-frame data and live sensor PID values with the fault present.
Clear the DTC, attempt to reproduce. Note whether the code returns and under what conditions (key on, charging, vehicle off).
Visually inspect sensor, wiring, and connectors for damage, corrosion, or water intrusion. Check for pin damage and secure mating.
Verify power and ground at the sensor: backprobe the connector and confirm reference voltage (eg. 5 V) and a good ground.
Measure sensor output voltage with ignition on and while charger is active. Compare to expected OEM ranges (consult service manual).
Use a clamp meter on the charger input conductors to measure actual current during charging. Compare measured current to sensor output (converted per spec).
If sensor output is high but measured current is normal, suspect sensor or wiring short to V+. Inspect for harness chafing or pin short to 12/ HV+ circuits.
Perform continuity and insulation resistance checks between sensor signal and battery/charger power to locate short.
Wiggle and load-test connectors and harness while monitoring live data to find intermittent faults.
If wiring and connectors test good but sensor output remains incorrect, replace the input current sensor for Charger B and retest.
If problem persists after sensor/harness replacement, test/replace the charger control module per OEM procedures.

Likely causes

Wiring short to battery positive at sensor (most likely)
Failed input current sensor (next most likely)
Poor ground or 5V reference feed to the sensor
Corroded/loose connector at sensor or charger
Charger module internal fault (less common)

Fault status

⚠️ Status

P2D84 — Battery Charger B Input Current Sensor Circuit High: Input current sensor for Charger B reporting an over-range/high signal or sensor circuit fault. Verify sensor, wiring, and charger operation.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1-3 hours