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.
Medium severity. Can I keep driving?Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.
Symptoms
- Warning lamp with stored code
- Live data shows a fixed extreme value
Most likely causes
- Signal or ground wire open, connector unplugged
- Signal wire shorted to the 5 V reference or another voltage
- Sensor element open internally
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2B70 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- B: Subsystem depends on the code range
- 70: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2B70?
Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.
What causes code P2B70?
The most common causes are: signal or ground wire open, connector unplugged; signal wire shorted to the 5 V reference or another voltage; sensor element open internally.
Related codes
- P2B6ETurbocharger/Supercharger A Temperature Sensor Circuit
- P2B6FTurbocharger/Supercharger A Temperature Sensor Circuit Low
- P2B71Turbocharger/Supercharger A Temperature Sensor Range/Performance
- P2B91Turbocharger/Supercharger B Temperature Sensor Circuit High
- P2EC1Turbocharger Compressor Outlet Temperature Sensor Circuit High
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.