Powertrain, generic (extended)

P26EC Engine Sound Control B Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Where a vehicle has two sound actuators, for instance one flap per tailpipe side or a valve in addition to an intake sound tube, B designates the second one. P26EC is stored when its drive circuit is broken, so switching the output produces no current. No manufacturer documents P26EC or the rest of the B row in public; information exists only for circuit A, such as Nissan's GT-R muffler valve, and for related exhaust valve drivers that Ford checks for open circuits over 5 seconds. Which physical part is B therefore has to come from the wiring diagram of the specific car. CARB treats outputs like this as monitored components where emissions can be affected. Expect the second valve to stay inactive while the engine runs normally.

Likely causes

Connector of the second actuator loose or disconnected
Wire to actuator B broken, for example by heat or vibration
Open winding inside actuator B

Symptoms

  • Check engine light, depending on the manufacturer
  • Sound changes only on one side or not at all

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–700
Time0.5–2.5 h

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

Parts involved

sound actuatorexhaust sound valvewiring harness

Related codes

P26EDP26EEP26EFP26DBP2BF8

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.