P2380 – Turbocharger Boost Sensor A/B Correlation

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: General | Location: Designator A

Definition source: SAE J2012/J2012DA (industry standard)

P2380 indicates the powertrain control module has detected a correlation (plausibility) problem between two turbocharger boost pressure sensor signals identified as Sensor A and Sensor B. In other words, the two inputs are not agreeing with each other in a way the control module expects under certain operating conditions. This is not automatically a confirmation that a turbocharger or sensor has failed; it is a signal-comparison fault that must be verified with testing. DTC behavior, enabling conditions, and diagnostics can vary by vehicle, so confirm component locations, pinouts, and test specifications using the correct service information.

What Does P2380 Mean?

P2380 means Turbocharger Boost Sensor A/B Correlation. The control module compares two separate boost pressure (or charge pressure) sensor signals—commonly used for plausibility checking and control accuracy—and determines that their relationship is outside the expected agreement window for the current operating conditions. This is a correlation/plausibility type fault, focused on how two related signals track each other rather than a single circuit being strictly high, low, or open. The DTC structure and terminology align with SAE J2012, while the exact test logic and conditions depend on the platform and must be verified in service information.

Quick Reference

• System: Powertrain
• Official meaning: Turbocharger Boost Sensor A/B Correlation
• Standard: ISO/SAE controlled
• Fault type: Plausibility (sensor correlation)
• Severity: The MIL may illuminate and the vehicle may enter reduced-power operation if boost control accuracy cannot be assured.

Symptoms

• MIL on: Check engine light illuminated with P2380 stored (current or pending).
• Reduced power: Noticeable loss of acceleration due to protective boost limiting.
• Boost control irregularity: Surging, inconsistent pull, or uneven power delivery under load.
• Driveability changes: Hesitation, stumbling, or poor response when requesting torque.
• Poor fuel economy: Increased fuel consumption caused by inefficient air-charge control.
• Abnormal shift feel: Transmission shift timing/feel may change when engine torque is limited.
• Other turbo-related codes: Additional boost pressure or air-metering plausibility codes may appear alongside P2380.

Common Causes

• Connector issues: Loose, corroded, oil-contaminated, or water-intruded terminals at either boost sensor connector causing skewed signals.
• Harness damage: Chafed, pinched, melted, or stretched wiring between the sensors and the control module, creating intermittent correlation errors.
• Shared reference/return fault: A problem in a shared 5V reference or sensor ground/low reference circuit that shifts one or both sensor outputs.
• High resistance in circuits: Increased resistance in signal, power, or ground circuits (poor pin fit, partial breaks, corrosion) causing biased readings under load.
• Sensor A or Sensor B skew: One boost sensor drifting, sticking, or responding slower than expected, leading to an implausible comparison during boost changes.
• Air path issues affecting plausibility: Charge-air leaks, intake restrictions, or plumbing faults that can cause pressure behavior that makes two readings disagree (diagnosis must confirm; not proven by the DTC alone).
• Control/actuation problems: Turbocharger control faults (actuator or control valve issues, vacuum/pressure control problems where used) that create boost behavior inconsistent with expected sensor agreement.
• Sensor port/hose problems: Blocked, restricted, or leaking pressure reference passages/hoses (where equipped) causing one sensor to see delayed or incorrect pressure.

Diagnosis Steps

Useful tools include a scan tool with live data, freeze-frame access, and the ability to log PIDs; a digital multimeter; back-probing leads; and basic hand tools for connector/harness inspection. A smoke machine or pressure tester for the intake/charge-air tract can help confirm plausibility issues. Use the correct wiring diagram and connector pinouts from service information, as sensor naming (A/B) and locations vary by vehicle.

1. Confirm the DTC and capture data: Verify P2380 is present. Record freeze-frame data, current/pendings, and any related boost, pressure, or airflow DTCs. Address power supply or reference/ground DTCs first if present.
2. Identify which sensors are “A” and “B”: Using service information, determine the exact sensors being compared (varies by vehicle). Confirm their locations, connectors, and whether either is integrated into another assembly.
3. Check scan tool live data at key states: With key on/engine off and then at idle, observe both boost-related sensor PIDs side by side. They should change logically with engine conditions and typically track in a consistent relationship. If one PID is frozen, erratic, or clearly offset, focus testing there.
4. Perform a visual inspection: Inspect sensor connectors, terminal condition, locking tabs, and harness routing. Look for rubbed-through insulation, oil saturation, heat damage, and areas where the harness can flex. Correct any obvious physical issues before deeper testing.
5. Wiggle test while logging: Log both sensor signals on the scan tool (and/or scope if available) while gently manipulating the harness and connectors for each sensor and along the main run to the control module. Any sudden dropouts, spikes, or correlation failures during movement indicate an intermittent connection or conductor issue.
6. Verify reference and ground integrity: With the sensors connected (where possible), back-probe the reference and sensor ground/low reference circuits. Confirm the reference supply is present and stable and that the sensor ground is not floating. If multiple sensors share the same reference/ground, check for an issue elsewhere on the shared circuit.
7. Voltage-drop test the ground and feed paths: Under conditions where the fault is likely (idle and a controlled increase in engine speed/load, as safe), perform voltage-drop testing on the sensor ground and power/reference circuits. Excessive drop indicates unwanted resistance from corrosion, poor pin fit, or damaged wiring (consult service info for acceptable limits).
8. Check signal circuit continuity and shorts: Key off, disconnect the relevant connectors, and test signal circuits for continuity end-to-end and for short-to-ground/short-to-reference conditions. Flex the harness during testing to reveal intermittent opens or shorts.
9. Inspect sensor pressure reference path (if equipped): If a sensor reads through a hose or a ported passage, check for restrictions, cracks, kinks, loose clamps, or blockage. A restricted port can cause delayed response and trigger correlation/implausibility even if wiring is good.
10. Evaluate air path plausibility: If electrical checks pass, test the intake/charge-air system for leaks or restrictions using an appropriate smoke/pressure method. Repair any confirmed leaks or mechanical issues and re-check sensor agreement with live data logging.
11. Component substitution only after circuit proof: If circuits, connectors, and air path checks are verified good and one sensor PID remains biased or slow to respond, follow service information for sensor testing. Replace only the sensor that testing supports, then clear codes and verify with a complete drive cycle.
12. Verify repair: Clear DTCs, run the vehicle through conditions similar to the freeze-frame (as safely possible), and confirm that P2380 does not return and that both sensor signals remain correlated in the data log.

Professional tip: Correlation faults are often intermittent and load-dependent. Prioritize capturing a data log that includes the moment the readings diverge, and compare it against freeze-frame conditions. If the disagreement appears only during harness movement or during a specific boost transition, focus on connector terminal tension, backing-out pins, and high-resistance splices using voltage-drop tests rather than relying on static continuity checks alone.

Possible Fixes & Repair Costs

Repair costs for P2380 vary widely because the underlying issue can be wiring-related, sensor-related, or a mechanical/air-path condition that causes sensor signals to disagree. Total cost depends on the diagnostic time required, parts needed, and labor access to sensors and charge-air plumbing.

• Repair wiring/connector faults: Clean corrosion, correct pin fit/terminal tension, repair damaged wiring, and secure harness routing for the boost sensor circuits involved.
• Restore power/ground integrity: Fix shared sensor reference/ground issues (as applicable) and address excessive resistance found during voltage-drop testing.
• Replace the faulty boost sensor: Replace sensor A and/or sensor B only after tests confirm one sensor is biased/skewed or fails plausibility checks.
• Correct intake/charge-air leaks: Repair loose clamps, leaking hoses, or sealing issues that can cause actual manifold/charge pressure to deviate and trigger a correlation fault.
• Service the boost control hardware: Address sticking/failed boost control components (varies by vehicle) if commanded boost and measured boost correlation tests indicate a control/response problem.
• Verify sensor installation and ports: Ensure sensors are correctly installed, seals are intact, and sensing ports/hoses (if used) are not restricted or contaminated.
• Software update or relearn: If service information specifies it, perform required relearns/adaptations and update control module calibration after repairs.

Can I Still Drive With P2380?

You may be able to drive short distances if the vehicle feels normal, but P2380 can coincide with reduced power strategies and unstable boost control because the control module no longer trusts the boost signals. If you have harsh hesitation, severe loss of power, abnormal noises from the intake/boost system, warning messages affecting power or engine protection, or any safety-critical symptoms (stalling, poor acceleration into traffic), do not continue driving—have the vehicle inspected and confirm the fault with service information and live data.

What Happens If You Ignore P2380?

Ignoring P2380 can lead to recurring warning lights, reduced performance, increased fuel consumption, and inconsistent drivability as the system limits boost to protect the engine. If the correlation issue is caused by a leak, restriction, or control fault, continued operation may increase thermal and mechanical stress and can contribute to additional fault codes being set over time.

Last updated: February 15, 2026

Vehicles Commonly Affected by P2380

• Turbocharged gasoline engines: Applications using multiple boost/pressure inputs for plausibility checking.
• Turbocharged diesel engines: Systems with charge-air pressure sensing and correlation logic.
• Vehicles with both pre- and post-throttle pressure sensing: Designs that compare two pressure locations (varies by vehicle).
• Vehicles with charge-air coolers and long plumbing runs: More joints and hoses can increase the chance of leaks affecting correlation.
• High-mileage vehicles: Greater likelihood of connector fretting, harness wear, and aging rubber couplers.
• Vehicles exposed to heat/vibration: Elevated stress on sensor wiring, connectors, and intake plumbing near the engine.
• Vehicles with prior intake/engine repairs: Misrouted hoses, loose clamps, or mismatched sensors can contribute to correlation faults.

After repairs, confirm P2380 is resolved by performing a complete road test under the enable conditions for the monitor and verifying that boost sensor A and boost sensor B remain correlated in live data and that no related pending codes return.