P0E21

Hybrid/EV Battery Pack Coolant Control Valve B Control Circuit Driver Current/Temperature Too High

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced performance of the hybrid system
Warning messages on the dashboard
Reduced power or range (for electric vehicles)
Battery overheating
Activation of emergency operation

Causes

Battery cooling valve malfunction
Problems with wiring or connectors
Short circuit in control circuit
Control module malfunction
Mechanical valve jamming

How to Fix

Check the condition of the battery cooling valve
Inspect wiring and connectors for damage
Check resistance and continuity of control circuit
Test the operation of the control module
Replace faulty valve or wiring components

Related codes

P0E22 P0E23 P0E20