Code
P2E86
Generic
P — Powertrain
Battery Charger B Input Voltage Sensor Circuit High
Views:
UK: 21
EN: 28
RU: 34
AI status
Completed
Completed
100%
Causes
- Shorted sensor signal wire to battery positive or other high-voltage source
- Faulty battery charger B input voltage sensor
- Poor or corroded connector or pin causing intermittent/high readings
- Open or high-resistance ground for sensor or charger control module
- Faulty battery charger/control module or PCM internal fault
- Blown/incorrect reference fuse or wiring to sensor reference voltage
Symptoms
- Charging-system warning lamp or MIL illuminated
- Reduced or disabled charging of the battery (depending on system)
- Stored P2E86 DTC and possibly related charger/pack codes
- Possible limp-home mode or limited vehicle functionality on some hybrids/EVs
- Intermittent charge faults or warning messages in instrument cluster
What to check
- Connect a scan tool, record freeze frame and live data for the Battery Charger B input voltage
- Visually inspect sensor, connector, and wiring harness for damage, corrosion, or loose pins
- Check related fuses and relays for the charger and sensor reference circuit
- Measure sensor signal voltage at the connector with key ON (backprobe) and compare to expected range
- Measure continuity and resistance between the sensor signal wire and battery positive and ground with power removed
- Disconnect the sensor and confirm whether the code/voltage reading changes
Signal parameters
- Typical sensor output: 0.0–5.0 V analog signal to PCM (manufacturer-specific)
- High condition: signal > ~4.7–5.0 V or above expected maximum for this input
- Reference voltage (if used): typically ≈5 V (check vehicle-specific data)
- No-load/open-circuit behavior: a true open may float high on some circuits—verify expected behavior from service info
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data. Note conditions when the code set (key on/off, engine run, state of charge).
- Clear codes and attempt to re-create the fault; observe whether P2E86 returns and under what conditions.
- Perform visual inspection of Battery Charger B harness, connectors, and the charger module for damage, corrosion, or water intrusion.
- Backprobe the sensor connector with the ignition ON and measure the signal voltage to chassis ground. Compare to expected range in service documentation.
- With power off, measure resistance/continuity between the signal wire and battery positive to check for a short. Also measure resistance to chassis ground to verify proper grounding (expected near 0 ohms for ground).
- Wiggle harness and connectors while monitoring live data to identify intermittent shorts or opens.
Likely causes
- Damaged harness with insulation rubbed through, contacting battery voltage
- Corroded or pushed-back terminal in the sensor/charger connector
- Sensor internal failure (stuck high output)
- Missing/poor ground at battery charger module
- Failed charger module that drives the sense line incorrectly
Fault status
Status
Battery Charger B input voltage sensor circuit reports high voltage — signal above expected range.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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