Powertrain, generic · Fuel and air metering

P012A Turbocharger/Supercharger Inlet Pressure Sensor A Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The turbocharger/supercharger inlet pressure sensor A sits between the air filter and the compressor. The engine uses it for the compressor pressure ratio, to judge air filter restriction (ambient minus inlet pressure) and to cross-check the other pressure sensors. P012A is the general circuit fault. Ford's 2023 diesels use a digital SENT sensor here and set P012A when its error flag is raised or the value exceeds a limit for 5 s; lost communication is reported separately (U068B). FCA's 2019 Jeep Wrangler 2.0 turbo could set P012A, P012C and P012D falsely and was fixed with new engine software, so the software level is worth checking before replacing parts. GM's supercharged V8 uses only P012B–P012D. A substitute value, usually ambient pressure, is used.

Likely causes

Connector or wiring open, corroded or shorted
Sensor faulty (SENT sensor reports internal error)
Control module software (false setting)
Engine control module faulty

Symptoms

  • Check engine light on
  • Often no noticeable symptoms
  • Power limitation possible

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–250
Time0.3–1 h

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

Parts involved

turbocharger inlet pressure sensor asensor wiringsensor reference voltage

Related codes

P012BP012CP012DP012EP006DP006C

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