Powertrain, generic (extended)

P2012 Intake Manifold Runner Control Circuit Low (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2012 means the ECM reads the control circuit of the bank 2 flap actuator too low, usually a short to ground in the wire or inside the actuator. Subaru is the one maker that names it publicly: on the 2017–2020 Impreza and 2018–2020 Crosstrek, including the plug-in hybrid, lubricant from the tumble generator valve actuator could leak and be drawn into the engine, after which the valve works erratically and P2009 or P2012 may set alongside the stuck codes. The TGV is part of the manifold, so the whole manifold is replaced with an updated one. No public table gives a threshold for bank 2; GM's bank 1 equivalent P2009 uses a ground resistance under 0.5 Ω or, on H-bridge drives, more than 8 A. CARB requires circuit faults of output components to be monitored continuously. Higher than expected readings are P2013, an open circuit is P2011.

Likely causes

Integrated tumble valve actuator leaking lubricant (Subaru Impreza/Crosstrek)
Bank 2 control wire shorted to ground
Corroded actuator connector

Symptoms

  • Malfunction indicator lamp on
  • Erratic idle or hesitation on light throttle

Repair estimate

DifficultyHardWorkshop job
Parts and labour€30–1,100
Time0.5–4 h

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

Parts involved

imrc actuatorintake manifold runner harness

Related codes

P2011P2013P2009P2007

References: static.nhtsa.gov, law.cornell.edu, gsi.ext.gm.com.