A short to ground in the interstage pressure sensor signal wire; An open circuit in the sensor signal or reference voltage wire; A failed interstage pressure sensor that cannot output the correct voltage; Corroded, loose, or damaged electrical connectors at the sensor or PCM; A faulty PCM driver for the sensor circuit, though this is uncommon; Water intrusion or physical damage to the sensor or its wiring harness; A missing or poor ground connection for the sensor circuit

DTC codes / P2Dxx · Hybrid propulsion / P2D23

P2D23Turbocharger Interstage Pressure Sensor A Circuit Low

Q: What does code P2D23 mean?

Turbocharger Interstage Pressure Sensor A Circuit Low. P2D23 means the powertrain control module (PCM) has detected a low-voltage signal on the circuit for the turbocharger interstage pressure sensor, which monitors pressure between the turbocharger's compressor stages on a two-stage turbo system. The PCM expects a voltage within a calibrated range, and a sustained low reading indicates a short to ground, an open circuit, or a sensor that cannot report correctly.

P2D23 means the powertrain control module (PCM) has detected a low-voltage signal on the circuit for the turbocharger interstage pressure sensor, which monitors pressure between the turbocharger's compressor stages on a two-stage turbo system. The PCM expects a voltage within a calibrated range, and a sustained low reading indicates a short to ground, an open circuit, or a sensor that cannot report correctly.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode triggered by the PCM to protect the turbocharger
Poor throttle response and sluggish acceleration, especially at low engine speeds
Rough running or hesitation under load if the PCM substitutes a default pressure value
Increased fuel consumption as the PCM adjusts fueling based on faulty pressure data
In rare cases, a noticeable whistling or whooshing noise if a related hose is disconnected

Common causes, most likely first

A short to ground in the interstage pressure sensor signal wire
An open circuit in the sensor signal or reference voltage wire
A failed interstage pressure sensor that cannot output the correct voltage
Corroded, loose, or damaged electrical connectors at the sensor or PCM
A faulty PCM driver for the sensor circuit, though this is uncommon
Water intrusion or physical damage to the sensor or its wiring harness
A missing or poor ground connection for the sensor circuit

How to diagnose and fix it

Connect a scan tool and verify P2D23 is current, then check for any related codes and freeze-frame data
Inspect the interstage pressure sensor and its wiring for obvious damage, corrosion, or loose connections
Measure the sensor reference voltage and ground at the connector with a multimeter, comparing to manufacturer specifications
Backprobe the signal wire and check for a short to ground or an open circuit while wiggling the harness
If the circuit tests good, remove the sensor and check for a blocked or cracked pressure port, then replace the sensor if faulty
Clear the code and perform a road test to confirm the repair, monitoring live pressure data for normal readings
If the code persists after sensor replacement, check the PCM connector and wiring for intermittent faults before condemning the PCM

What a low interstage pressure code really means

A low voltage code does not automatically mean the sensor is bad; a shorted signal wire or a poor ground can produce the same reading and is often overlooked.
On two-stage turbo systems, the interstage pressure sensor is easily confused with the intake manifold pressure sensor, so verify the location using a wiring diagram before testing.
A disconnected or cracked interstage pressure hose can cause a low signal without any electrical fault, so always inspect the mechanical connection.
The PCM may set this code only after a specific driving cycle, so a simple key-on check may not reveal the fault; a road test with live data is essential.
After replacing the sensor, some vehicles require a relearn or adaptation procedure, and skipping it can leave the code stored even though the repair is correct.

Can I keep driving with P2D23?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration and towing because the PCM may limit boost and the engine can enter limp mode. Prolonged driving with a faulty interstage pressure sensor can lead to poor fuel economy and increased turbocharger stress.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.