What it means
HVIL loop E voltage below expected range. 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 E is a safety circuit whose voltage the control module monitors. This code sets when loop E voltage is below the expected range; a wire shorted to ground is one possible cause. The resulting fault may also interfere with communication used by dependent systems.
Common causes
Most likely first.
- Interlock wire shorted to ground
- 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 loop E, gateway, and CAN faults to establish whether the low-voltage report is isolated to this loop.
- Read loop E voltage and status in live data and compare them with the manufacturer's specification.
- With the high-voltage system safely disabled according to the vehicle's service procedure, inspect accessible loop E wiring for chafing, crushed insulation, corrosion, or loose connectors.
- Have a qualified technician test loop E for a short to ground and verify continuity using the manufacturer's procedure.
- If network faults affect multiple modules, check gateway routing and CAN termination before replacing loop E parts.
Common fixes
- Repair loop E wiring that is shorted to ground.
- Clean, secure, or replace a damaged loop E connector or terminal.
- Correct gateway routing if communication tests identify a gateway fault.
- Repair or replace CAN termination components that fail the manufacturer's specification.
Can I keep driving?
Do not drive if the vehicle shows high-voltage warnings, limp mode, or shutdown symptoms; arrange safe diagnosis. Low voltage in loop E can disable high-voltage operation, and high-voltage wiring should only be handled by qualified personnel.
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.