Powertrain, generic (extended)

P2B70 Turbocharger/Supercharger A Temperature Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2B70 is set when sensor A on the turbocharger or supercharger delivers a signal above its valid range. For an NTC thermistor this corresponds to an implausibly cold reading, the classic result of an open signal or ground wire, an unplugged connector or a short to the 5 V reference; for a PTC-type element it would indicate extreme heat. No manufacturer publishes this code, so it remains open which point of the charging system the sensor watches. CARB 13 CCR 1968.2 (e)(15) has the fault stored apart from P2B6F and from the general circuit code P2B6E. The engine computer then usually works with a substitute value, and protective functions that rely on this temperature can only act in a limited way. Checking pin fit and continuity usually finds the cause.

Likely causes

Signal or ground wire open, connector unplugged
Signal wire shorted to the 5 V reference or another voltage
Sensor element open internally

Symptoms

  • Warning lamp with stored code
  • Live data shows a fixed extreme value

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–400
Time0.5–2 h

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

Parts involved

turbocharger a temperature sensorwiring harnessecm

Related codes

P2B6EP2B6FP2B71P2B91P2EC1

References: law.cornell.edu, en.wikipedia.org.