P0E7D — Coolant bypass valve B control circuit — high electrical level

P0E7D concerns coolant bypass valve B control circuit. The monitor reports an electrical level above its expected range. This is an electrical control-circuit finding, not a direct statement that the coolant is overheating.

Affected system: Engine/coolant thermal control

Symptoms

• System warning may illuminate
• Affected feature may be unavailable
• Symptoms depend on the vehicle

Possible causes

• Hybrid powertrain sensor, actuator, power supply, connector, or control issue
• Module power, ground, or connector fault
• Vehicle-specific mechanical or control issue

What to check

• Record all available module faults
• Record hybrid and electric powertrain module faults with a compatible scan tool. Check the specified low-voltage supplies and module data first; follow vehicle-specific high-voltage safety procedures for further diagnosis.
• Compare results with vehicle-specific service information
• Verify the repair
• Record hybrid and electric powertrain module faults with a compatible scan tool. Check the specified low-voltage supplies and module data first; follow vehicle-specific high-voltage safety procedures for further diagnosis.
• Repair the verified cause and rescan all affected modules

Also written as: P0E7D-00, P0E7D00, POE7D (some scan tools add the fault-type byte, e.g. -00).