Engine-Codes - Generic - P12F9

P12F9 - Cylinder Deactivation Exhaust Flow Valve Feedback Circuit High Frequency Bank 2

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P12F9 Possible Causes

  • Faulty Cylinder Deactivation Exhaust Flow Valve
  • Cylinder Deactivation Exhaust Flow Valve harness is open or shorted
  • Cylinder Deactivation Exhaust Flow Valve circuit poor electrical connection

How is the P12F9 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P12F9 code

Labor: 1.0

The cost to diagnose the P12F9 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P12F9 Meaning

The cylinder deactivation exhaust flow control system consists of valves installed at the inlet of the muffler. The exhaust flow control system is used to tune the exhaust note. The Powertrain Control Module (PCM) monitors the Cylinder Deactivation Exhaust Flow Valve. The PCM sets the OBDII code when the Cylinder Deactivation Exhaust Flow Valve is not to factory specifications.

More Information

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Information for specific makes

  • P12F9 CHEVROLET Cylinder Deactivation Exhaust Flow Valve Feedback Circuit High Frequency Bank 2
  • P12F9 GMC Cylinder Deactivation Exhaust Flow Valve Feedback Circuit High Frequency Bank 2

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