P0E18

Hybrid/EV Battery Pack Coolant Heater B Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
Battery heating problems
Reduced vehicle power
Increased fuel consumption (for hybrids)

Causes

Coolant heater malfunction
Heater control circuit problems
Malfunction of the hybrid system control unit
Short circuit in wiring
Poor contact in connectors

How to Fix

Check the integrity of the heater control circuit
Check the resistance of the heating element
Inspect connectors and wiring for damage
Check the operation of the hybrid system control unit
Replace coolant heater if necessary

Related codes

P0E16 P0E17 P0E19