P023D
Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor A Correlation
Boost pressure sensing
Generic OBD-II
High
What it means
P023D means the manifold-absolute-pressure (MAP) sensor and the turbo/supercharger boost sensor are reporting readings that don't agree with each other. Because the ECM relies on these to manage boost and fueling, it may cut power or enter limp mode until it can trust the sensors again.
High
Can I keep driving? Usually driveable for short trips, but you may lose power or drop into limp mode under boost; get it checked before hard driving or towing.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power, especially above idle or under boost
- Limp mode / reduced-power mode
- Hesitation or surging under acceleration
Common causes
Most likely first
- Damaged wiring or a corroded connector at the MAP or boost sensorLikely
- A faulty MAP sensor or turbo/supercharger boost sensorCommon
- Boost leak or vacuum leak causing the two readings to disagreeCommon
- Sticking wastegate or a genuine turbo/boost faultLess often
How to diagnose & fix
Work through it in order
- Read live data and compare the MAP and boost-sensor readings to see which is off.
- Inspect both sensors' wiring and connectors for damage or corrosion.
- Check the intake, charge pipes, and vacuum lines for boost or vacuum leaks.
- Replace the sensor confirmed to be out of range, then verify the readings agree. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P023D?+
Light driving is usually fine, but the engine may limit boost and power. Avoid hard acceleration or towing until it's diagnosed.
Can I just clear P023D?+
It returns once the two sensor readings disagree again. You need to find why they don't correlate — a sensor, wiring, or a boost leak.
Related codes
Often seen with P023D
Read & clear P023D 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