P2DB8

Code

Generic P — Powertrain

Battery Charging System B High Voltage Interlock Circuit Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 43 RU: 24

AI status

Completed

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Page language: EN

Causes

Open or short in HVIL wiring harness
Corroded/damaged HV connector pins or seals
Loose or improperly seated high-voltage connector (charger or battery)
Faulty charger unit or charging control module
Failed HV interlock switch, sensor, or contactor
Poor ground or blown fuse/interrupt in low-voltage sense circuit

Symptoms

Charging system B disabled or will not start charging
Charge status lamp or HV fault/warning message displayed
Reduced available charging power or repeated charge interrupts
DTC stored and possibly other related HVIL/charging codes
Vehicle may enter limited functionality or charge fault mode

What to check

Read and record freeze frame and all stored/related DTCs with a capable scan tool
Verify state of charge and low-voltage battery before diagnostics
Visually inspect all HV connectors, seals and wiring for damage, corrosion or loose locks
Check for water ingress, contamination or crushed harness areas along routing
Confirm fuses, fusible links, and HV contactor operation for Charging System B
Do not perform hands-on work on live HV components unless qualified — isolate HV per manufacturer procedure

Signal parameters

HVIL continuity: near 0 ohm when closed; open circuit/infinite resistance when interlock open
Expected low-voltage sense signal: typically 0–12 V depending on design (refer to service manual for exact values)
Intermittent or fluctuating voltage on HVIL line indicates loose connector or chafe
No HV present to exposed terminals when system is de-energized and HV is isolated

Diagnostic algorithm

Retrieve freeze frame and all related codes. Note vehicle conditions when fault set (charging, plug-in, etc.).
Follow manufacturer safe service procedures to disable and isolate high-voltage system before physical inspection.
Visually inspect Charger B and battery HV connectors, locking features, silicone seals and harness along routing for damage, corrosion or contamination.
With HV isolated and service manual guidance, measure continuity of the HVIL circuit from the control module/charger connector to the battery/connector pin. Look for open, short to ground or short to other HV conductors.
Reconnect and, using a qualified technician and approved equipment, monitor HVIL signal voltage during a controlled charging attempt (or while system attempts to energize) to check for intermittent signals or out-of-range values.
Perform a wiggle test of harness/connectors while monitoring the signal to reproduce intermittent faults (take care — follow HV safety procedures).
Inspect/verify operation of charging contactors and interlock switches; replace any component that fails to meet specification.
If wiring and connectors check good, test/replace the charger control module or battery interface module as permitted by diagnostic flow. Reprogram or update module software if service bulletins indicate fixes.
After repairs, clear codes and perform a full charge/discharge cycle or drive cycle to confirm the fault does not return.

Likely causes

Damaged pin(s) or wiring at battery/charger HV interlock connector
HV connector not fully mated or locking clip broken
HVIL circuit shorted to chassis or adjacent HV conductor
Charger detects interlock open and disables charging
Wiring chafed at harness routing or connector block

Fault status

⚠️ Status

Battery Charging System B — High Voltage Interlock Circuit Performance Fault. Charging may be disabled; inspect HVIL wiring, connectors, contactors and charger control module. Observe HV safety procedures.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-4.0 hours

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