P023E
Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation
Turbo / boost & air metering
Generic OBD-II
High
What it means
P023E means the manifold absolute pressure (MAP) signal and the 'B' turbocharger/supercharger boost pressure signal no longer agree with each other. The module cross-checks these two readings, and when they diverge beyond its threshold it can no longer trust the boost data — commonly causing reduced power or a limp mode until the disagreement is resolved.
High
Can I keep driving? The engine usually still runs but may drop into a reduced-boost limp mode with noticeably less power; drivable, but have it checked before hard driving.
Common symptoms
What you'll notice
- Check-engine light on
- Loss of power above idle or a reduced-boost limp mode
- Hesitation or sluggish acceleration
- Erratic boost behavior
Common causes
Most likely first
- Open, shorted, or chafed wiring in the boost-sensor 'B' circuitLikely
- Poor electrical connection at the boost or MAP sensor connectorCommon
- Faulty turbo/supercharger boost pressure sensor 'B'Common
- Faulty manifold absolute pressure (MAP) sensorLess often
- Boost leak or a mechanical turbo/wastegate fault skewing actual pressureLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare the MAP and boost-sensor 'B' readings on a scan tool at idle and under load.
- Inspect both sensor connectors and wiring for opens, shorts, and corrosion.
- Check for intake/boost leaks and confirm the wastegate/actuator operates correctly.
- Test each sensor's signal against spec and replace whichever reads out of range.
- Clear the code and road-test to confirm the readings track together.
FAQ
Quick answers
Is it safe to drive with P023E?+
Short term yes, but expect reduced power. Sustained driving with a boost fault can stress the turbo system, so repair it soon.
Can I just clear P023E?+
It will return once the two pressure signals disagree again. The wiring, sensor, or boost-leak cause has to be fixed first.
Related codes
Often seen with P023E
Read & clear P023E yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX