What Does P1146 Mean?
This code indicates the pressure sensor circuit is providing a signal that is at the high end of its expected range or above the maximum voltage threshold. This typically refers to a fuel pressure, EVAP system pressure, or turbo boost pressure sensor depending on the vehicle manufacturer. The ECM has determined the sensor input voltage exceeds normal operating parameters, suggesting either an actual over-pressure condition or an electrical fault in the sensor circuit.
Common Causes
30%
Faulty pressure sensor providing erroneously high voltage output
25%
Short to voltage in the pressure sensor signal wire
15%
Clogged or restricted pressure sensor reference port or line
15%
Actual over-pressure condition in the monitored system
15%
Corroded connector causing voltage feed-through on the signal circuit
Diagnostic Steps
1
Identify which specific pressure sensor is referenced by P1146 for the vehicle's manufacturer (fuel rail, EVAP, boost, etc.).
2
Monitor the pressure sensor PID with a scan tool; compare the reading to actual pressure measured with a mechanical gauge.
3
Inspect the sensor connector for corrosion, moisture, and pin damage that could cause a short to the reference voltage.
4
Check the sensor signal wire for shorts to the 5V reference or battery voltage.
5
If the sensor has a vacuum/pressure reference hose, verify it is not kinked, clogged, or disconnected.
6
Replace the pressure sensor if electrical and wiring checks pass but the reading remains out of range.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
This code indicates the pressure sensor circuit is providing a signal that is at the high end of its expected range or above the maximum voltage threshold. This typically refers to a fuel pressure, EVAP system pressure, or turbo boost pressure sensor depending on the vehicle manufacturer. The ECM ha...
The most common cause of P1146 (Pressure sensor circuit range/performance problem (high input)) is: Faulty pressure sensor providing erroneously high voltage output
Typical repair costs for P1146 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Depends on the specific pressure sensor. A fuel rail pressure sensor reading high may cause the ECM to reduce fuel delivery, leading to lean misfires. A turbo boost sensor reading high could trigger overboost protection. In either case, drivability may be significantly affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1146 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Engine Management
Difficulty
Type
Manufacturer
Recommended Tools
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