What Does P006D Mean?
The ECM has detected a correlation error between the barometric pressure (BARO) sensor and the turbocharger/supercharger inlet pressure sensor. At key-on engine-off, both sensors should read atmospheric pressure. During operation, the turbo inlet sensor should track slightly below BARO under boost conditions (as the compressor draws air). A significant disagreement indicates a sensor fault or air intake restriction. The driver may notice reduced turbo performance, incorrect altitude compensation, or the check engine light.
Common Causes
35%
Failed barometric pressure sensor or turbo inlet pressure sensor
25%
Severe air filter restriction causing abnormally low inlet pressure
20%
Sensor wiring or connector fault causing incorrect readings
12%
Intake air path obstruction (debris, collapsed duct, blocked snorkel)
8%
ECM calibration or software issue with pressure correlation thresholds
Diagnostic Steps
1
At KOEO, compare BARO and turbo inlet pressure sensor PIDs. Both should read the same atmospheric pressure (roughly 101 kPa at sea level). A sensor reading significantly off at rest is the fault source.
2
Compare both readings against a known-good reference barometer or local weather station pressure (adjusted for altitude). This identifies which sensor has drifted.
3
Inspect the air filter — a severely clogged filter will cause the inlet pressure to drop significantly below atmospheric under engine operation, exceeding the BARO correlation threshold.
4
Check the sensor connectors and wiring for both the BARO and turbo inlet sensors. Look for corrosion, water intrusion, or damaged pins. Measure sensor supply voltage (typically 5V reference).
5
If sensors and wiring check out, verify no intake path obstructions exist — rodent nests in the air box, collapsed intake duct, or aftermarket air intake components that may not seal properly.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The ECM has detected a correlation error between the barometric pressure (BARO) sensor and the turbocharger/supercharger inlet pressure sensor. At key-on engine-off, both sensors should read atmospheric pressure. During operation, the turbo inlet sensor should track slightly below BARO under boost c...
The most common cause of P006D (Barometric Pressure - Turbocharger/Supercharger Inlet Pressure Correlation) is: Failed barometric pressure sensor or turbo inlet pressure sensor
Typical repair costs for P006D range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The primary concern is incorrect altitude compensation affecting fuel mixture and boost targets. Performance may be slightly reduced. If the air filter is the cause, it is an easy fix. No immediate safety hazard. Repair within 2-3 weeks.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P006D to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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