Charge inlet or charger connector not fully seated, or damaged or contaminated interlock pins; Open circuit, chafed wire or corroded terminal in the high voltage interlock loop wiring; Loose or missing high voltage connector, cover or service plug that forms part of the interlock loop; Water ingress or corrosion in the charging inlet or charger module connector; Low 12 volt supply voltage or poor earth causing the loop monitoring to fail; Fault inside the on-board charger or charging control module interlock circuit.

P0D15

Battery Charging System A High Voltage Interlock Circuit/Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
D: AreaReserved
15: FaultThe specific fault in that area

What it means

P0D15 means the control unit monitoring the battery charging system (circuit A) has detected that its high voltage interlock loop is open or not complete. This low-voltage safety loop proves that high voltage connectors, covers and the charging path are properly connected, and when it breaks the system will usually refuse to charge or close the high voltage contactors. The exact loop layout and components in it depend on the vehicle and system design.

Symptoms

Hybrid or electric system warning light on the dash
Vehicle will not charge from the charge port or on-board charger
Reduced power or limp mode, or the car will not go into READY or drive mode
Intermittent charging that stops when the cable or connector is moved
Other high voltage or charger fault codes stored alongside

Possible causes

Charge inlet or charger connector not fully seated, or damaged or contaminated interlock pinslikely
Open circuit, chafed wire or corroded terminal in the high voltage interlock loop wiringlikely
Loose or missing high voltage connector, cover or service plug that forms part of the interlock looppossible
Water ingress or corrosion in the charging inlet or charger module connectorpossible
Low 12 volt supply voltage or poor earth causing the loop monitoring to failpossible
Fault inside the on-board charger or charging control module interlock circuitrare

How to diagnose

Read all stored and pending codes and freeze frame data, noting whether the fault is current or intermittent and what the vehicle was doing when it set.
Check the 12 volt battery condition and charging voltage, as low voltage can set false circuit faults, and look for other related codes.
Try a different known-good charging cable and charge point, and visually inspect the charge inlet for damage, debris, moisture, bent pins or heat marks.
Inspect accessible low voltage interlock wiring and connectors for chafing, pushed-out pins, corrosion and water, and check that all high voltage covers and connectors are fitted and latched.
Following the manufacturer procedure, have a suitably trained high voltage technician make the system safe before touching any orange high voltage components.
With the system isolated, test interlock loop continuity and resistance section by section against the manufacturer data to find the open point.
Check the supply, earth and signal at the charger or charging control module connector, and wiggle-test the harness while monitoring live data.
Only after the wiring and connectors are proven good, consider the charger or control module as the fault.

How to fix

Clean, refit or replace the charge inlet or connector if the interlock pins or housing are damaged or contaminated.
Repair or replace the damaged section of interlock wiring, and renew corroded or loose terminals and connectors.
Refit and correctly latch any loose high voltage connector, cover or service plug in the loop, replacing any damaged part.
Dry out and treat water ingress properly, replacing any connector or seal that has corroded or failed.
Restore the 12 volt battery and earth connections to a healthy state if low voltage was involved.
Replace the on-board charger or charging control module only if testing confirms an internal fault, then clear the code and retest charging.

Can I keep driving?

Medium severity

If the car drives normally you can usually keep using it for a short time, but charging may not work and the fault may leave it with reduced power or unable to start. Do not work on orange high voltage parts unless trained, and stop driving if power is lost or other high voltage warnings appear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.