P25FA

Turbocharger/Supercharger Bypass Valve C Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–167 (est.)

Symptoms

Reduced engine power
Check Engine Light Illuminates
Dips during acceleration
Engine transition to emergency mode

Causes

Control circuit short circuit to positive
Bypass valve B fault
Wiring harness damage
Problems with connectors
Engine control unit malfunction

How to Fix

Check the integrity of the wiring harness
Check resistance of bypass valve B
Check control circuit voltage
Replace bypass valve if necessary
Check/replace control unit if necessary

Related codes

P25F9 P25FB P25FC