P0E77

Coolant Bypass Valve A Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Engine overheating
Insufficient engine warm-up
Unstable engine operation
Increased fuel consumption
Check Engine Light Illuminates

Causes

Open circuit in valve control circuit
Short circuit to positive in the circuit
Coolant bypass valve malfunction
Wiring Harness Problems
Engine control unit (ECU) malfunction

How to Fix

Check valve control circuit integrity
Check the resistance of the coolant bypass valve
Inspect the wiring harness for damage
Check the operation of the coolant bypass valve
If necessary, replace the valve or repair the circuit

Related codes

P0E76 P0E78 P0E79