Powertrain, generic (extended)

P2077 Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The feedback signal of the bank 1 tuning valve has dropped below its plausible lower edge, typically because the signal is shorted to ground or the line is open with a pull-down. GM states it in percent of the sensor range: in 2006/2007 and again in the 2015/2018 tables a reading of 95 % or more counts as low, so GM's scaling is inverted; once 320 of every 400 checks (one each 12.5 ms) fail, it is stored as Type B. The Bosch-style logic in GM's 2023/2024 tables uses a raw voltage under about 0.7 V. FCA names P2077 for the manifold tuning valve of the 2007-2010 3.5L V6 (Sebring, Avenger, Journey, Pacifica) and advises checking the actuator duty cycle before replacing the manifold. Ford lists P2077 without MIL. P2078 is the high side.

Likely causes

Signal wire shorted to ground or chafed against the engine
5 V reference to the sensor interrupted
Actuator with integrated sensor defective (FCA 3.5L, check duty cycle first)

Symptoms

  • Check engine light (GM Type B; Ford without MIL)
  • Stuck-valve tests P2070/P2071 disabled
  • Driving often unchanged

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–350
Time0.3–2 h

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

Parts involved

imt position sensor

Related codes

P2078P2075P2076P207CP2071

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, performanceparts.ford.com.