P2370 – Boost Pressure Sensor Circuit High

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit High

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2370 indicates the engine control module has detected a “high” electrical condition in the boost pressure sensor circuit. “Circuit high” points to the sensor signal being higher than expected for the operating conditions, typically due to an electrical issue (such as a short to a voltage source, an open in the ground path, or a reference/signal fault), not a confirmed mechanical boost problem by itself. How the fault is monitored, when the code sets, and what failsafe actions occur can vary by vehicle, so always verify testing procedures and specifications in the appropriate service information.

What Does P2370 Mean?

P2370 means Boost Pressure Sensor Circuit High. Based on the official definition, the powertrain controller has identified that the boost pressure sensor circuit is reporting an abnormally high electrical input. In SAE J2012 terms, this is a circuit-level fault classification: the controller is responding to an out-of-range high signal or high circuit condition rather than confirming a specific physical boost pressure state. The correct diagnostic approach is to test the sensor circuit (power, ground, reference, signal, and connector integrity) and confirm the controller is receiving an implausibly high electrical value.

Quick Reference

• System: Powertrain
• Official meaning: Boost Pressure Sensor Circuit High
• Standard: ISO/SAE controlled
• Fault type: Circuit High
• Severity: MIL illumination is possible and the vehicle may enter reduced-power operation, affecting drivability during acceleration or load changes.

Symptoms

• MIL on: Check engine light may illuminate and remain on until the fault is corrected and the monitor completes.
• Reduced power: Engine may limit torque/boost and feel sluggish, especially during acceleration or under load.
• Poor acceleration: Noticeable hesitation or weak response when requesting power, particularly at higher throttle openings.
• Abnormal shifting: Transmission shift quality may change if torque management is altered due to the detected fault.
• Unstable boost indication: Live data (or gauge where equipped) may show a boost/pressure reading that is stuck high or spikes unexpectedly.
• Rough running: Idle or part-throttle operation may become uneven if airflow/torque calculations are affected by the high signal.
• Limp mode: Some vehicles may activate a protection strategy that limits boost and throttle response.

Common Causes

• Sensor signal short-to-power: The boost pressure sensor signal circuit is shorted to a voltage source, driving the signal higher than expected.
• Open sensor ground: A broken/loose ground circuit at the sensor or shared ground splice can cause the signal to read high.
• High resistance in ground path: Corrosion, poor pin fit, or damaged wiring increases resistance and biases the signal high.
• Reference circuit fault: A reference feed issue (such as being pulled high by a short) can skew sensor output high (design varies by vehicle).
• Connector problems: Spread terminals, water intrusion, corrosion, or partially seated connectors at the sensor or control module.
• Harness damage: Chafing, pinched wiring, or heat damage causing unintended contact with power circuits.
• Boost pressure sensor internal fault: Sensor electronics biased high or internally shorted.
• Control module input/circuit fault: Rarely, an internal input fault or terminal damage at the module side of the circuit.

Diagnosis Steps

Tools typically needed include a scan tool capable of reading live data and freeze-frame, a digital multimeter, and back-probing or breakout leads. Access to the correct wiring diagram and connector pinouts for your vehicle is important. For intermittent faults, a test light and basic harness inspection tools can help, and a recording/live-data logging feature is useful.

1. Confirm the DTC and capture data: Verify P2370 is present. Record freeze-frame and any companion codes, then review the conditions when the fault set. Clear codes and see if P2370 returns immediately or only under certain operating conditions.
2. Check for related electrical codes first: If other sensor reference/ground or circuit high codes are present, address them in order of service information priority because shared circuits (power, reference, or ground) can affect the boost pressure sensor circuit.
3. Initial visual inspection: With key off, inspect the sensor, connector, and harness routing. Look for rubbed-through insulation, pinched sections, heat damage, corrosion, or evidence of moisture intrusion. Confirm connectors are fully seated and locked.
4. Connector and terminal integrity check: Disconnect the sensor connector and inspect terminal tension and pin fit. Check for pushed-out pins, spread terminals, corrosion, or oil/water contamination. Repair terminal issues before deeper electrical testing.
5. Live-data plausibility at key-on: With the scan tool, monitor the boost pressure sensor parameter at key-on engine-off, then start the engine (if possible) and observe changes. A persistently “pegged high” reading is consistent with a circuit-high condition and supports focusing on shorts-to-power or ground faults.
6. Reference and ground circuit checks: Using the wiring diagram, identify the sensor reference feed and sensor ground pins. With the connector back-probed (or using approved breakout methods), verify the reference feed is present and stable, and verify the ground circuit integrity. If ground integrity is questionable, proceed to voltage-drop testing under load.
7. Voltage-drop test the ground under load: Apply an appropriate load (per service information) and perform a voltage-drop test on the sensor ground circuit between the sensor ground pin and a known-good ground. Excessive drop indicates resistance from corrosion, damaged wiring, or poor connections that can bias the signal high.
8. Signal circuit short-to-power test: With the sensor disconnected, check the signal circuit for unwanted voltage and for continuity to power sources (method and expected results vary by vehicle). If the signal shows power when it should not, isolate by unplugging intermediate connectors and inspecting harness segments to locate the short.
9. Signal circuit continuity and isolation: Verify continuity from the sensor signal pin to the module input pin, and check for shorts between the signal circuit and adjacent circuits. Perform these tests with connectors disconnected as directed by service information to avoid damaging control modules.
10. Wiggle test with data logging: With the engine running (or key-on if engine cannot run), wiggle the harness and connectors while logging the boost pressure sensor parameter and watching for spikes toward “high” or sudden dropouts. Focus on known flex points, near brackets, and areas with prior repairs.
11. Sensor substitution only after circuit verification: If wiring, terminals, reference, and ground test good and the signal circuit is not being driven high externally, follow service information to confirm sensor operation. Replace the boost pressure sensor only when testing indicates the sensor itself is the source of the high signal.
12. Module-side evaluation (last): If all circuit tests pass and P2370 persists, inspect module connector pins for damage and verify no terminal fretting or poor fit. Only consider control module fault after all external circuit and sensor causes are eliminated per service information.

Professional tip: If P2370 is intermittent, prioritize finding a harness/terminal issue: perform a long enough live-data log to catch the moment the signal jumps high, then correlate it with vibration events and harness movement. A clean voltage-drop test on the ground and a careful short-to-power isolation on the signal circuit often locate the root cause faster than swapping parts.

Possible Fixes & Repair Costs

Repair costs for P2370 vary widely by vehicle and depend on what testing reveals, how accessible the sensor and harness are, and whether the issue is wiring-related or a component/module fault. Diagnose first to avoid unnecessary parts replacement and repeat failures.

• Repair harness damage: Restore chafed, pinched, or melted wiring; route and secure away from heat and moving parts after verifying the circuit no longer reads high.
• Clean and re-pin connectors: Remove corrosion, correct poor terminal tension, and replace damaged terminals/locks to eliminate unintended voltage feed or an open ground.
• Correct power/ground faults: Repair opens or high resistance in sensor ground, or shorts to a power feed that can drive the signal high; confirm with post-repair voltage-drop checks.
• Replace the boost pressure sensor: If wiring and connector integrity are proven good and the signal remains biased high, replace the sensor and verify the code does not return.
• Repair shared reference circuits: If other sensors sharing the same reference or return circuit show abnormal readings, repair the common splice, reference feed, or ground distribution point (varies by vehicle).
• Software update or module replacement (as last resort): If service information indicates a known control-module calibration issue or if the input circuit is proven correct yet the module interprets it as high, follow the specified update or replacement procedure.

Can I Still Drive With P2370?

You may be able to drive briefly if the vehicle runs normally, but avoid hard acceleration and towing because incorrect boost-pressure feedback can trigger reduced power strategies and unstable performance. If the vehicle enters limp mode, stalls, has a no-start condition, or you see warnings that affect braking or steering assist, do not drive; have it diagnosed and repaired first.

What Happens If You Ignore P2370?

Ignoring P2370 can lead to recurring MIL illumination, reduced power or poor drivability, inconsistent boost control behavior, and potentially increased emissions because fueling and air management may be limited or incorrect. Continued operation with an unresolved electrical fault can also worsen connector or harness damage, turning an intermittent issue into a hard fault.

Last updated: February 15, 2026

Vehicles Commonly Affected by P2370

• Turbocharged gasoline engines: Systems using a boost pressure sensor for closed-loop boost and load calculations.
• Turbocharged diesel engines: Applications with boosted intake air management and emissions controls that rely on pressure feedback.
• Supercharged engines: Configurations using manifold/boost pressure sensing for airflow modeling and protection strategies.
• Engines with multiple pressure sensors: Vehicles that use both boost and manifold pressure inputs with shared reference/ground circuits (varies by vehicle).
• Vehicles with top-mounted heat exposure: Harnesses routed near hot components where insulation breakdown can cause shorts to power.
• High-mileage vehicles: Increased likelihood of brittle wiring, terminal fretting, and intermittent connector contact.
• Vehicles with recent repairs: Prior sensor, intake, or engine-bay work where harness routing or connector seating may be disturbed.
• Off-road or high-vibration use: Conditions that can loosen terminals, stress splices, and promote intermittent electrical faults.

For a reliable repair, confirm whether the high signal is caused by a short-to-power, an open ground/return, or a sensor bias issue, then verify the fix with a recheck and a short road test while monitoring live data (procedure varies by vehicle).