A high-voltage interlock connector that is not fully seated or has a broken latch, commonly at the charging port or battery pack.; Corrosion or water intrusion in a high-voltage interlock connector, causing increased resistance or a short to ground.; A damaged interlock wire (open circuit or short to ground) in the harness between the charging port and the control module.; A faulty high-voltage interlock switch inside a component such as the charge port assembly or battery disconnect unit.; A failed control module that monitors the interlock circuit, though this is less common.; Aftermarket accessories or improper previous repairs that disturbed the high-voltage interlock loop.

DTC codes / P0Dxx · Hybrid propulsion / P0D17

P0D17Battery Charging System A High Voltage Interlock Circuit Low

The battery charging system A high voltage interlock circuit is a safety loop that confirms the high-voltage connectors are fully seated before the vehicle allows high-voltage charging to occur. Code P0D17 is set when the control module detects a low voltage condition on this interlock circuit, meaning the loop is broken or shorted to ground. The computer has commanded the charging system to disable high-voltage charging as a protective measure.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

The high-voltage charging system may be completely disabled, preventing the vehicle from accepting a charge.
A red or yellow high-voltage warning light illuminated on the dashboard.
The vehicle may refuse to start or enter a ready-to-drive state if the interlock fault is severe.
Often no symptoms besides the warning light, especially if the low voltage is intermittent.
The charging port door or connector may feel loose or fail to latch properly.
Other high-voltage system codes may be stored alongside P0D17.

Common causes, most likely first

A high-voltage interlock connector that is not fully seated or has a broken latch, commonly at the charging port or battery pack.
Corrosion or water intrusion in a high-voltage interlock connector, causing increased resistance or a short to ground.
A damaged interlock wire (open circuit or short to ground) in the harness between the charging port and the control module.
A faulty high-voltage interlock switch inside a component such as the charge port assembly or battery disconnect unit.
A failed control module that monitors the interlock circuit, though this is less common.
Aftermarket accessories or improper previous repairs that disturbed the high-voltage interlock loop.

How to diagnose and fix it

Inspect all high-voltage interlock connectors for proper seating, latch integrity, and corrosion, starting at the charging port and working toward the battery pack.
Use a scan tool to read live data for the interlock circuit voltage and compare it to the service information specification.
Perform a continuity and short-to-ground test on the interlock circuit wiring using a digital multimeter, following the manufacturer's wiring diagram.
Check the high-voltage interlock switch inside the charge port assembly for correct operation and replace the assembly if faulty.
Verify the control module's ground and power supply are intact before condemning the module itself.
If all wiring and connectors test good, substitute a known-good control module to confirm the fault before replacement.
Clear the code and perform a road test or charging cycle to verify the repair and ensure the code does not return.

Interlock faults that fool good technicians

A loose high-voltage connector that looks fully seated can still set P0D17 because the interlock pin makes contact before the main terminals, so always check for a fully latched connector rather than just a visual fit.
Water intrusion in the charging port interlock circuit is a frequent cause that leaves no visible corrosion until the connector is disassembled, so inspect the pins under magnification.
The code can be stored intermittently by a driver who forcefully yanks the charging cable out without pressing the release, damaging the interlock switch over time.
A low voltage on the interlock circuit does not always mean the high-voltage battery is faulty; the fault is often in the low-voltage monitoring loop, so avoid condemning the battery pack prematurely.
Some vehicles set P0D17 as a companion code when the 12-volt battery is weak or the control module resets during cranking, so always check system voltage stability first.

Can I keep driving with P0D17?

Do not continue driving or charging the vehicle until the interlock fault is repaired, because the high-voltage system may be disabled and the vehicle could lose power unexpectedly. Have the vehicle towed to a qualified service facility if it will not start or charge.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.