What Does P0236 Mean?
The turbocharger boost pressure sensor A is providing readings that are outside the expected range for current operating conditions, though the signal voltage is within its normal electrical range. The ECM has determined the boost pressure reading does not correlate with throttle position, RPM, or wastegate commands. This rationality failure means the ECM cannot trust the sensor data for boost control.
Common Causes
30%
Boost pressure sensor A drifting or providing inaccurate readings due to age or contamination
25%
Boost leak in the charge piping causing actual pressure to differ from expected
20%
Blocked or restricted pressure reference hose to the sensor
15%
Actual boost control fault causing unexpected pressure levels
10%
High resistance in sensor wiring causing voltage offset
Diagnostic Steps
1
Compare the boost pressure sensor A PID to an external boost gauge at idle, off-boost, and under full boost. If they disagree, the sensor may have drifted.
2
Perform a boost leak test: pressurize the intake system to 15–20 psi with a boost leak tester and listen/feel for leaks at coupler joints, intercooler end tanks, and charge pipes.
3
Inspect the pressure reference line to the sensor for kinks, blockages, or moisture/oil accumulation. A partially blocked line causes delayed or dampened readings.
4
At key-on engine-off, the sensor should read barometric pressure (~14.7 psi at sea level). If it reads off by more than 1 psi, the sensor has drifted and should be replaced.
5
Verify the wastegate is actually controlling boost by monitoring commanded vs. actual boost during a controlled pull. If they track but the sensor disagrees, the sensor is faulty.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
The turbocharger boost pressure sensor A is providing readings that are outside the expected range for current operating conditions, though the signal voltage is within its normal electrical range. The ECM has determined the boost pressure reading does not correlate with throttle position, RPM, or w...
The most common cause of P0236 (Turbocharger Boost Sensor A Circuit Range/Performance.) is: Boost pressure sensor A drifting or providing inaccurate readings due to age or contamination
Typical repair costs for P0236 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drive conservatively. Inaccurate boost sensor readings mean the ECM may not properly control boost pressure, risking overboost or underboost conditions. The ECM will likely enter a protective mode. Avoid wide-open-throttle operation and diagnose promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0236 to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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