What it means
The BMS detects a circuit range/performance fault on voltage sense channel E of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The BMS measures a cell group through voltage-sense channel E and checks whether its signal behaves within an expected range. This code sets when the channel E measurement does not match the expected range or performance, even if the circuit is not simply stuck high or low.
Common causes
Most likely first.
- Poor connection or high resistance in the sense circuit
- Damaged sense wiring
- Fault in the battery voltage-sensing module
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Capture freeze-frame data and compare channel E live readings with adjacent cell-group voltages during the conditions that set the fault.
- Inspect channel E's accessible wiring and connectors for corrosion, looseness, damage, or contamination that could add resistance.
- With the vehicle powered down as specified by the manufacturer, check channel E circuit continuity and look for shorts or excessive resistance using the manufacturer's procedure.
- Have a qualified technician compare the channel E signal at the battery sensing module with scan-tool data to locate a wiring-related signal discrepancy.
- If the channel E circuit and connections meet the manufacturer's specification, assess the sensing module for an input or processing fault.
Common fixes
- Clean and secure a poor channel E connector connection.
- Repair channel E wiring with damage or excessive resistance.
- Replace damaged channel E terminals or connector components.
- Repair or replace the voltage-sensing module if its channel E reading remains out of range with a sound circuit.
Can I keep driving?
Limit driving if the vehicle has reduced power, and avoid relying on normal EV range or charging until channel E is checked. The BMS may impose further power or charging limits because it cannot validate that cell-group reading.
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.