P0D17
Battery Charging System A High Voltage Interlock Circuit Low.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- 17
- FaultThe specific fault in that area
What it means
P0D17 is a generic code for a low signal in the high voltage interlock circuit (HVIL) serving battery charging system A on a hybrid or electric vehicle. The interlock is a low-voltage safety loop that runs through high voltage connectors and covers to confirm they are fitted and secure. The control unit saw the loop voltage lower than expected, which points to a short to ground or a wiring or module fault. It may then restrict or block charging and, depending on the model, high voltage system operation.
Symptoms
- Charging fails to start or stops soon after starting
- Hybrid or EV system warning light or message on the dash
- Malfunction indicator lamp on
- Car will not go into ready mode, or has reduced power, on some models
- Charge port lock or charging indicator behaves oddly
Possible causes
- Interlock wiring chafed or shorted to ground in the charging circuit harnesslikely
- Damaged, wet or corroded pins in a high voltage connector or charge port interlock contactslikely
- Faulty interlock switch or sensor in the charge inlet or a charger or converter unitpossible
- Water ingress or contamination in the charge port or an on-board charger connectorpossible
- Fault inside the on-board charger or the control unit that monitors the interlock looppossible
- Previous repair or collision damage leaving a harness pinched or a connector incorrectly fittedrare
How to diagnose
- Read all stored and pending codes and freeze frame data, noting whether other high voltage or charging codes are present and if the fault is current or intermittent.
- Check for manufacturer bulletins and the model-specific interlock circuit layout, as the loop route and test values vary by vehicle.
- Visually inspect the charge port, its seals and the visible charging harness for damage, moisture, corrosion, or signs of a pinch or rub.
- Confirm the vehicle is in a safe state and only a trained high voltage technician carries out any work on orange-cable components, following the manufacturer's isolation procedure.
- Inspect the interlock connectors and pins at the on-board charger and other loop components for bent, pushed-back or contaminated terminals and check they are fully seated.
- With the system isolated, test the low-voltage interlock loop wiring for a short to ground and for continuity against the model wiring diagram.
- Check the interlock switch or sensor at the charge inlet for correct operation per the manufacturer's procedure.
- Clear the code, retest charging and recheck for the fault returning to confirm the repair.
How to fix
- Repair or replace the damaged interlock wiring where it is shorted to ground, using the correct repair method for the vehicle.
- Clean, dry or replace corroded or damaged connectors and terminals, and refit them securely with seals intact.
- Replace a faulty charge port or interlock switch assembly if testing shows it is at fault.
- Dry out and seal any area with water ingress and replace affected components if contamination has caused damage.
- Replace or repair the on-board charger or controlling module only after wiring and connectors have been proven good, and apply any required software update from the manufacturer.
Can I keep driving?
If the car still drives normally you can use it carefully, but charging may be unreliable, so get it checked soon. If a high voltage system warning shows, power is reduced or the car will not start, stop and have it inspected by a qualified high voltage technician.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.