Powertrain, generic (extended)

P2D13 Exhaust Flow Control Valve C Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2D13 tells that the drive circuit of a third exhaust flap, valve C, is open or cannot be evaluated. Such a valve only exists on layouts with more than two controlled flaps, for instance a separate bypass in the rear silencer next to one flap per bank. No manufacturer publishes P2D13 or any other valve C code. Ford's 2020-2024 OBD summaries know only valve A on bank 1 and valve B on bank 2; there a smart driver watches the output all the time and flags an open within about 5 seconds under subtype 13. GM's 23OBDG07 tables run the same open-circuit test on an exhaust valve PWM line, but report it as the valve B code P2BF8 after 4 seconds. Under CARB rules, output components like this need circuit monitoring. A connector left off after exhaust work, a broken wire or an internal open in the actuator are the usual finds.

Likely causes

Actuator connector unplugged or loose after exhaust work
Broken control wire near the hot exhaust or at a bracket
Internal open in the valve C actuator
Failed output stage in the control module

Symptoms

  • Check engine light
  • Flap C stays in its rest position, exhaust sound does not change
  • Message that an exhaust or drive mode is unavailable

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.4–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust flow control valve cwiring harnessecm

Related codes

P2D14P2D15P2D16P26C5P2BF8

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.