Powertrain, generic (extended)

P2009 Intake Manifold Runner Control Circuit Low (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2009 narrows the bank 1 flap control fault down to a low signal, which in practice means the control line has found a path to ground. GM's 2018 diesel tables flag a resistance to ground below 0.5 Ω in 12 of 15 checks every 100 ms (Type B), and the 2014 Cruze diesel waits until the short has lasted more than 3 s. In GM's 2025 DC-motor swirl drive the H-bridge is switched on and the code sets when its current exceeds 8 A in 240 of 300 samples. On the 2010 Saab 9-5 diesel the ECM uses P2009 for a grounded control circuit of the swirl solenoid. Subaru lists P2009, together with P2012 for bank 2, among codes on 2017–2020 Impreza and Crosstrek where grease from the tumble valve actuator leaks into the engine; the actuator is not sold alone, so the manifold is replaced. A chafed harness or water in the plug are the usual causes.

Likely causes

Control wire chafed through and touching ground
Internal short in the solenoid or actuator motor
Leaking integrated tumble valve actuator (Subaru Impreza/Crosstrek)
Water or corrosion in the actuator connector

Symptoms

  • Malfunction indicator lamp on
  • Flaps cannot be switched, uneven running at low speed

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–900
Time0.3–3 h

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

Parts involved

imrc solenoidimrc wiring

Related codes

P2008P2010P2012P200A

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, saabwisonline.com.