What it means
Generic fault on HVIL loop K. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
The high-voltage interlock loop (HVIL) K monitors continuity through part of the high-voltage system. This general circuit code means the control module has detected an abnormal condition on loop K, without identifying a low, high, or performance pattern.
Common causes
Most likely first.
- HV connector not fully mated
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Record freeze-frame data and scan all modules for related HVIL, gateway, and CAN faults to see whether loop K is the only circuit named.
- Check live data for the loop K status and note whether it reports open, closed, or intermittent behavior.
- With the high-voltage system made safe under the manufacturer's procedure, inspect accessible loop K connectors for incomplete mating, corrosion, or damaged terminals.
- Inspect accessible loop K wiring for breaks, pinching, or loose connections, avoiding contact with energized high-voltage components.
- Have a qualified technician test loop K continuity, then check gateway routing and CAN termination against manufacturer specifications if the loop tests correctly.
Common fixes
- Reseat an incompletely mated loop K connector using the manufacturer's safety procedure.
- Repair damaged loop K wiring or connector terminals.
- Correct a confirmed gateway message-routing fault.
- Repair CAN termination if it is outside the manufacturer's specification.
Can I keep driving?
This loop K fault can cause warning lights, high-voltage shutdown, or limp mode. Avoid driving if propulsion or essential functions are affected, and have a qualified technician check the circuit.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.