P2E8F

Code

Generic P — Powertrain

Battery Charger B Charge Sequence Signal 2 Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 20 EN: 44 RU: 32

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Page language: EN

Causes

Open or short to ground in the Charge Sequence Signal 2 wiring
Poor connector or corrosion at charger or control module
Blown fuse or faulty relay feeding the charger control electronics
Faulty Battery Charger B control/driver module
Faulty vehicle control module (BCM/PCM/EV ECU) that reads or drives the signal
Software calibration/firmware issue or interrupted programming

Symptoms

Charging disabled or reduced charge rate for battery pack B
Charge-related warning light or EV/system fault indicator illuminated
Longer-than-normal charge time or inability to complete charge
DTCs related to charging, battery pack, or communication appearing concurrently

What to check

Check for other related DTCs and freeze-frame/live-data with a scan tool
Visually inspect connectors and harness for damage, corrosion, water entry
Verify fuses and relays for charger power and control circuits
Measure voltage at the signal pin with key on/charger commanded
Wiggle-test harness and connector while monitoring the signal for intermittent faults
Check grounds for cleanliness and secure connection

Signal parameters

Typical signal type: low-voltage logic or PWM control/feedback (manufacturer dependent)
Expected idle voltage (example): ~0.5–4.5 V for analog/logic signal; low condition often
PWM signals: common frequency range 20–200 Hz; duty cycle varies with charge state
A true 'low' fault usually means the measured voltage is near 0 V or stuck low compared to expected
Reference power and ground must be present at the charger control module for valid signal

Diagnostic algorithm

Retrieve all stored codes and live data using a suitable scan tool; note freeze-frame and concurrent codes.
If safe, clear the code and attempt to reproduce while monitoring the Charge Sequence Signal 2 data stream / PID.
Visually inspect connectors, pins and harness from the charger to the vehicle control module for damage or corrosion; repair as needed.
Verify supply power and ground to the charger and to any intermediate modules (check fuses/relays).
Backprobe the signal wire at the charger-side connector and at the control module while operating or commanding a charge; confirm voltage and waveform with a multimeter/oscilloscope.
If signal is low at the control module but normal at the charger (or vice versa), isolate and test continuity/resistance of the wire between them. Repair wiring or connector faults.

Likely causes

Loose or corroded connector at Battery Charger B
Open/shorted signal wire to ground between charger and control module
Failed charger control electronics (internal driver circuit)
Missing reference power or ground to charger or sensor circuit

Fault status

⚠️ Status

Battery Charger B Charge Sequence Signal 2 Circuit Low — signal voltage below expected threshold; charging behavior may be limited. Inspect wiring, connectors, power/ground, and charger/control modules.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours