P00AF Turbo boost control module performance fault

Turbocharger/supercharger boost control A module performance

P00AF in short

P00AF means the turbo boost control module A is not performing as the computer expects. On a 6.7L Cummins it is often the electronic turbo actuator or its harness; Volkswagen has a software update for some 2013 cars. It can reduce power, so get it checked soon.

The computer commands the turbo or supercharger through a boost control module or actuator. P00AF sets when that module reports a fault or the boost does not match what was commanded.

On the 6.7L Cummins, the electronic turbo actuator runs its own diagnostics and reports internal errors to the PCM, and Mopar1973Man lists the actuator harness or the actuator as likely causes.

Volkswagen's 2013 bulletin summary says a software diagnostic fault set P00AF, commonly at high altitude, and that revised ECM software fixed it in production.

Most likely causes

  1. Turbo actuator or its harness fault (Cummins 6.7L)

    Supported by vehicle data
    Why it ranks here
    Mopar1973Man says the actuator reports internal errors, and lists the harness or the actuator.
    What would change this
    Rises if the actuator connector is dirty or damaged or U010C is also stored. Falls if the actuator communicates normally.

  2. Software diagnostic fault (some 2013 VW)

    Supported by vehicle data
    Why it ranks here
    VW's bulletin summary says a software fault sets P00AF, especially at altitude; revised ECM software was already in production. The cached summary was the only part read.
    What would change this
    Rises if the car is in the bulletin range and was driven at altitude. Falls if software is current.

  3. Turbo mechanical fault, boost leak or sensor

    Common general cause
    Why it ranks here
    PartsAvatar lists wiring, vacuum leaks, control solenoid, boost sensor and turbo failure.
    What would change this
    Rises if boost is low and the actuator tests normal. Falls if boost matches commands.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all codes, noting U010C and other turbo codes, and ask a dealer about software updates.

    Low riskTool: scan tool

  2. Have the turbo actuator connector, harness and boost system inspected.

    Best left to a shop

    Warning:The turbo and exhaust are very hot; leave this to a shop.

Symptoms

  • Check engine light
  • Turbo lag or power loss Gets more serious: stop and have it checked.
  • Poor fuel economy

Compare with: Check engine light with loss of power

How to fix

On your vehicle

Volkswagen

  • 2013 · Jetta

    Supported by vehicle data

    A VW bulletin summary says a software fault sets P00AF at altitude on the 2013 Jetta, Golf and Beetle, fixed by revised ECM software. Only the cached summary was read.

  • 2033034Status unverified

    Update programming: MIL on, P00AF in ECM fault memory

    2013jetta, golf, beetle · NHTSA 10125618

    Software fault sets P00AF, commonly at altitude; revised ECM software is the remedy.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P00AF yet.

All Turbocharging, fuel pressure and EGR codes

P00AF questions

Is P00AF a software problem?

Sometimes. Volkswagen issued software for some 2013 cars, but on Cummins trucks the actuator or harness is more likely.

Sources and review

  1. P00AF Turbocharger Boost Control Module Performance (R619), Cummins 6.7L — Mopar1973Man (Dodge Cummins reference)
  2. P00AF OBD error code summary — PartsAvatar
  3. VW 2033034: update programming, MIL on, P00AF in ECM fault memory — Volkswagen via NHTSA manufacturer communications flat file
Last reviewed
Written by
Saurabh K.
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