P2E8D

Code

Generic P — Powertrain

Battery Charger B Charge Sequence Signal 1 Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 24 RU: 20

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Page language: EN

Causes

Open or shorted wiring on the Charge Sequence Signal 1 circuit (open circuit or short to ground).
Corroded or loose connector pins at the charger, ECU/BCM or junctions.
Failed or stuck charger control module (Battery Charger B).
Blown fuse, faulty fuse holder, or failed charge relay/contactor in the charging control circuit.
Poor or missing ground reference for the charger or vehicle control module.
Low pack/battery voltage preventing charger control circuitry from operating

Symptoms

Charge sequence fails to start or charging is not available for Battery Charger B.
Reduced or no charging current from Battery Charger B.
Charge system warning lamp or message on dash (e.g., Charger Fault, Do Not Charge).
Stored DTC P2E8D (and possibly related charger/pack codes).
Possible loss of expected charging behavior or reduced driving range (if hybrid/EV).

What to check

Retrieve freeze frame data and complete DTC list; check for related codes (charger, pack, BC/ECM).
Visually inspect harness, connectors and grommets for damage, corrosion, or moisture around the charger and control modules.
Check fuses and charge relays/ contactors for correct operation and continuity.
Back-probe the Charge Sequence Signal 1 pin at the charger and at the control module while commanding charge; measure voltage and compare to expected.
Perform continuity and resistance checks between control module and charger signal pin with connectors disconnected.
Check and verify charger and vehicle grounds are clean, tight and have low resistance.

Signal parameters

Signal type: typically a low-voltage logic or request/feedback line (may be 0–5 V logic or a 0–12 V automotive signal depending on vehicle).
Expected active voltage: system-dependent. Commonly an active/high state is ~3–12 V; a ‘low’ fault is detected when the line is below the manufacturer threshold (often
Inactive/low state: typically near 0 V (ground) — DTC triggered when low persists while a charge should be commanded.
Some systems use PWM or pulsed communication for sequence lines — expected duty cycle and frequency are manufacturer specific.
Expected circuit resistance (static): low ohms to module reference; open circuit or very high resistance indicates break in wiring.

Diagnostic algorithm

Safety: If vehicle is hybrid/EV, follow high-voltage safety procedures and isolate the HV system per manufacturer instructions before probing high-voltage components.
Read codes and freeze frame: Note conditions when DTC set (ignition state, pack voltage, temperature, requested charge).
Attempt commanded charge while monitoring: With appropriate safety measures, command a charge (or request charger operation) and back-probe the Charge Sequence Signal 1 at the control module and at the charger connector to confirm the line state.
Inspect connectors: Disconnect and inspect both ends of the harness for corrosion, bent pins, pushed-out terminals or water intrusion. Repair or replace as required.
Wiring continuity: With ignition off, measure continuity/resistance between charger signal pin and the control module pin. Check for shorts to ground or +B. Repair damaged harness sections and re-test.
Check fuses/relays/contactors: Verify supply and switched power to the charger control circuit; replace any faulty fuses or relays and verify contactor operation.
Verify grounds and supply voltages: Measure ground resistance and the charger’s supply voltage during attempted operation. Clean and tighten grounds if high resistance is found.
Module swap or bench test: If wiring and power are good, verify charger control module operation per manufacturer procedures. If available, substitute a known-good module or perform manufacturer-specified bench tests.
Reflash/ECU update: If wiring and hardware test good but fault persists, check for available software updates or known software faults and reflash per service information.
Clear codes and retest: After repairs, clear DTC(s) and confirm proper charge sequence during repeated tests and monitor for recurrence.

Likely causes

Damaged connector or wiring between PCM/BCM and Battery Charger B (most common).
Bad solder joint or internal failure in the charger control module.
Failed charge-enable relay/contactor or blown fuse affecting the signal reference.
Corroded ground at charger or vehicle chassis causing signal to read low.
Vehicle control module not commanding the sequence due to another fault or software issue.

Fault status

⚠️ Status

Battery Charger B: Charge Sequence Signal 1 Circuit Low — charging disabled or unreliable. Inspect wiring, connectors, fuses/relays and charger module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours