What Does P023E Mean?
The ECM has detected a correlation error between the manifold absolute pressure (MAP) sensor and the turbocharger/supercharger boost pressure sensor 'B'. Similar to P023D but affecting the secondary boost sensor circuit, the two pressure readings are diverging beyond acceptable limits. The driver may notice inconsistent boost, reduced engine power, or the vehicle entering limp mode.
Common Causes
30%
Faulty boost pressure sensor 'B' providing inaccurate readings
25%
Faulty MAP sensor providing inaccurate readings
25%
Boost leak in the intake tract between the turbo outlet and intake manifold
15%
Blocked or cracked pressure reference line to sensor B
5%
Wiring fault or poor connection at sensor B
Diagnostic Steps
1
Compare live data PIDs for MAP sensor and boost sensor B simultaneously — at idle both should read near atmospheric pressure (98-102 kPa at sea level). Log data during a controlled boost event and note where the readings diverge.
2
Perform a pressurized boost leak test on the entire intake tract. Pay special attention to the piping near boost sensor B's sampling point.
3
Inspect the pressure reference line to sensor B for cracks, blockages, or moisture contamination. Disconnect and blow through the line to verify it is clear.
4
With the key on and engine off, check sensor B's output voltage — it should read approximately 1.0-1.5V at atmospheric pressure. Compare against the MAP sensor reading at the same condition.
5
If sensor readings are close at idle but diverge under boost, suspect a mechanical issue such as a partially restricted intercooler core or a collapsed charge pipe under boost pressure.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The ECM has detected a correlation error between the manifold absolute pressure (MAP) sensor and the turbocharger/supercharger boost pressure sensor 'B'. Similar to P023D but affecting the secondary boost sensor circuit, the two pressure readings are diverging beyond acceptable limits. The driver ma...
The most common cause of P023E (Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor "B" Correlation) is: Faulty boost pressure sensor 'B' providing inaccurate readings
Typical repair costs for P023E range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving is possible but the ECM may limit boost to protect the engine. Incorrect sensor correlation can lead to improper air-fuel ratios and detonation risk under load. Avoid hard acceleration and towing until the problem is diagnosed and repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P023E to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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