Powertrain, generic (extended)

P2079 Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Intermittent (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Intended for brief dropouts or jumps in the bank 1 valve feedback that come and go rather than sticking at one limit. No manufacturer documents this meaning publicly. GM's tuning valve tables stop at P2076 to P2078, and Ford's 2014 code list even assigns P2079 to an intake air system leak, an older Ford-specific text that has nothing to do with the position sensor, so scan-tool texts on Ford vehicles can differ. Per CARB, intermittent faults of an input component are covered by the circuit and rationality checks. Loose crimp contacts, a cracked connector housing or a cable that moves with engine rock are the classic sources; wiggle testing while watching the live value is the most useful check.

Likely causes

Loose or fretted terminals in the sensor connector
Wire broken inside the insulation, contact lost with engine movement
Dead spot on the sensor track

Symptoms

  • Light comes and goes (manufacturer-dependent)
  • Fault often not present during workshop test

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–300
Time0.5–2.5 h

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

Parts involved

imt position sensor

Related codes

P2075P2077P2078P207E

References: law.cornell.edu, performanceparts.ford.com, gsi.ext.gm.com.