P2D12

Exhaust Flow Control Valve B Position Not Learned

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Deterioration in acceleration dynamics
Increased noise level of the exhaust system
Check Engine Light Illuminates
Unstable engine idling
Increased fuel consumption

Causes

Mechanical failure of the exhaust gas flow control valve
Valve control circuit problems
Valve dirty or stuck
Software error in the engine control unit
Open or short circuit in wiring harness

How to Fix

Check the mechanical condition of the exhaust gas flow control valve
Diagnose the electrical valve control circuit
Clean or replace a stuck valve
Update engine control unit software
Check the integrity of the wiring harness

Related codes

P2D11 P2D13 P2D14