OBD Guide
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P12FF

Cylinder Deactivation Exhaust Flow Valve Actuator Performance Bank 2

P12FF is an OBD-II diagnostic trouble code meaning: Cylinder Deactivation Exhaust Flow Valve Actuator Performance Bank 2. Common causes: exhaust gas flow control valve malfunction, valve control circuit problems. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Deterioration of vehicle dynamics
  • Increased fuel consumption
  • Unstable engine operation
  • Check Engine Light Illuminates
  • The cylinder deactivation system may not work

Causes

  • Exhaust gas flow control valve malfunction
  • Valve control circuit problems
  • Mechanical valve jamming
  • Problems with the engine control unit
  • Contamination or carbon deposits on the valve

How to Fix

  1. Check valve control circuit
  2. Check valve functionality manually
  3. Clean the valve from dirt if necessary
  4. Replace faulty valve
  5. Flash or update engine control unit software

Related codes

P12FEP12FDP12FC

FAQ

What does the P12FF code mean?

P12FF is an OBD-II diagnostic trouble code that indicates: Cylinder Deactivation Exhaust Flow Valve Actuator Performance Bank 2

What causes a P12FF error code?

The most common causes of P12FF include: Exhaust gas flow control valve malfunction; Valve control circuit problems; Mechanical valve jamming; Problems with the engine control unit.

How do I fix a P12FF diagnostic trouble code?

To fix P12FF: Check valve control circuit. Check valve functionality manually. Clean the valve from dirt if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P12FF?

Yes, but get it checked soon

How much does it cost to fix P12FF?

The estimated repair cost for P12FF is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat