P023E high Severity

P023E: Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation

May cause reduced engine performance, loss of boost, poor fuel economy, and possible limp mode activation

Overview

P023E indicates a MAP sensor and turbocharger/supercharger boost sensor B correlation discrepancy, triggering a PCM diagnostic trouble code related to pressure readings mismatch

Common Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced acceleration and decreased engine performance
  • Poor fuel economy
  • Hesitation or surging during acceleration
  • Possible unusual engine noises under boost

Most Common Causes

Faulty MAP sensor high

MAP sensor providing incorrect intake manifold pressure data causing mismatch with boost sensor

Faulty turbocharger/supercharger boost sensor B high

Boost sensor B failure or degraded performance leading to conflicting pressure signals

Wiring or connector faults between sensors and PCM medium

Open, shorted, corroded or loose connections can disrupt signal correlation

Vacuum or boost leaks in intake or intercooler medium

Leaks can alter actual pressures, causing sensor readings to diverge

PCM software error or failure low

Less common; possible after software updates or internal PCM faults

Diagnostic Steps

  1. Retrieve stored codes and freeze frame data using an OBD-II scanner
    Expected: P023E present with relevant live data
    Interpretation: Confirmation of trouble code and operating conditions when fault occurred
  2. Visually inspect MAP and boost sensor B connectors and wiring
    Expected: No damage, corrosion, loose pins, or disconnections
    Interpretation: Wiring integrity ensures signals are not compromised by harness issues
  3. Measure reference voltage and ground at both sensors using a multimeter
    Expected: Stable reference (typically ~5V) and good ground
    Interpretation: Proper supply confirms sensors are powered and grounded correctly
  4. Compare live MAP and boost sensor B readings under various engine loads
    Expected: Consistent relationship between manifold pressure and boost pressure
    Interpretation: Deviations indicate sensor or system fault
  5. Perform smoke or pressure test for vacuum/boost leaks
    Expected: No leaks detected
    Interpretation: Leaks can cause inaccurate pressure readings triggering the code

Repair Solutions

Replace faulty MAP sensor medium
Estimated Cost: $80 - $240

Ensure correct part and calibration for the specific vehicle

Replace turbocharger/supercharger boost sensor B medium
Estimated Cost: $100 - $300

Part cost varies by make and model

Repair wiring harness and connector issues medium
Estimated Cost: $50 - $150

Cost depends on extent of wiring damage

Fix vacuum/boost leaks medium
Estimated Cost: $50 - $500

Includes hose, intercooler, or clamp repairs

Update or reprogram PCM software easy
Estimated Cost: $0 - $200

May be covered by manufacturer software update

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Misinterpreting P023E as simple MAP sensor failure without checking boost sensor or wiring
  • Attributing symptoms solely to turbocharger mechanical failure without validating sensor data first
  • Replacing PCM prematurely without verifying sensor and circuit integrity

Frequently Asked Questions

Technical definition of P023E OBD-II Code

When your OBD-II scanner reads P023E, it means: Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation. This code is related to the vehicle's Air Intake.

How serious is the P023E code?

With a severity level of high, may cause reduced engine performance, loss of boost, poor fuel economy, and possible limp mode activation

How do I know if I have code P023E?

Common symptoms include: Check Engine Light (MIL) illuminated, Reduced acceleration and decreased engine performance, Poor fuel economy. You might also notice the Check Engine Light is on.

What parts fail when P023E is set?

This code is frequently triggered by: Faulty MAP sensor, Faulty turbocharger/supercharger boost sensor B, Wiring or connector faults between sensors and PCM.

How much does it cost to fix P023E?

It depends on what needs to be fixed. Repair wiring harness and connector issues repairs are cheaper (~$150), while Fix vacuum/boost leaks repairs are on the higher end (~$500).

Does code P023E apply to Chevrolet vehicles?

P023E is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

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