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DTC codes / Volkswagen codes / P1552

P1552 · VolkswagenBarometric Pressure Sensor Circuit Open Short To Ground

P1552 on Volkswagen vehicles means the engine control module (ECM) has detected an open circuit or a short to ground in the barometric pressure sensor circuit. The barometric pressure sensor, often integrated into the ECM or the mass airflow sensor depending on the model, measures atmospheric pressure so the ECM can calculate air density and adjust fuel delivery; this code sets when the signal voltage falls outside the expected range for the current conditions.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or stumbling, especially at high altitudes where barometric pressure is lower
  • Reduced engine performance or lack of power under acceleration
  • Poor fuel economy or rich-running condition due to incorrect air density calculation
  • Occasional hesitation or surge during light throttle applications
  • In some cases, the engine may enter limp mode and limit RPM

Common causes, most likely first

  1. Damaged or disconnected wiring harness to the barometric pressure sensor
  2. Corroded or loose electrical connector at the sensor or ECM
  3. Failed barometric pressure sensor (internal open or short)
  4. Short to ground in the signal wire between the sensor and ECM
  5. Faulty ECM (rare but possible, especially if water intrusion has occurred)
  6. Rodent damage to the wiring loom near the sensor
  7. Poor ground connection for the sensor circuit

How to diagnose and fix it

  1. Perform a visual inspection of the barometric pressure sensor and its wiring for obvious damage, corrosion, or loose connections
  2. Check the sensor's electrical connector for proper seating and clean any corrosion with electrical contact cleaner
  3. Use a scan tool to read live data from the barometric pressure sensor and compare it to actual atmospheric pressure (key on, engine off)
  4. Measure resistance and continuity of the sensor's signal and ground wires from the sensor connector to the ECM to check for opens or shorts
  5. Test the sensor itself by applying vacuum or pressure (if applicable) and observing signal voltage changes, or swap with a known-good sensor
  6. Repair any damaged wiring or replace the sensor as needed, then clear the code and verify the repair with a test drive
  7. If the code persists after all checks, inspect the ECM connectors for corrosion or water damage and consider ECM replacement as a last resort

Barometric sensor faults that fool technicians

  • On many Volkswagen engines, the barometric pressure sensor is integrated into the mass airflow sensor (MAF), so a faulty MAF can set P1552 even when the MAF itself seems to be working; always check the barometric pressure reading in live data.
  • A short to ground in the signal wire can be intermittent and only appear when the engine bay is hot or after hitting a bump, so wiggle-test the harness while watching live data.
  • The ECM may substitute a default barometric pressure value when the sensor fails, allowing the engine to run almost normally at sea level; this is why some drivers notice no symptoms besides the light.
  • Water intrusion into the ECM connector or sensor connector can cause this code, especially on vehicles with clogged sunroof drains or cowl leaks; always check for moisture.
  • Do not replace the ECM before verifying the sensor and wiring, as misdiagnosed ECM replacements are common and expensive; the fault is usually in the harness or sensor.

Can I keep driving with P1552?

You can generally drive with this code, but expect reduced fuel economy and possible rough running, especially at high altitudes. Avoid sustained heavy acceleration or towing until the fault is repaired, as incorrect air density calculations can cause rich running and potential catalytic converter damage over time.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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