What Does P0452 Mean?
The fuel tank pressure sensor is reading lower than the PCM's minimum expected voltage. This low input typically indicates a grounded signal wire, a failed sensor pulling the signal low, or a loss of 5V reference power. The EVAP system cannot be monitored, and the check engine light will illuminate. The driver will not notice any drivability changes.
Common Causes
35%
Failed fuel tank pressure sensor with internally shorted element
25%
Signal wire shorted to ground in the wiring harness
20%
Open or lost 5V reference supply to the FTP sensor
15%
Corroded connector or water intrusion at the FTP sensor
5%
PCM sensor input pull-up or reference circuit failure
Diagnostic Steps
1
Check the FTP sensor voltage on scan tool live data. A low input code means the signal is typically below 0.1-0.3V.
2
Disconnect the FTP sensor connector. If the signal voltage at the PCM jumps up to near 5V, the sensor is shorted internally—replace the sensor.
3
If voltage stays low with the sensor disconnected, measure the signal wire resistance to ground at the harness connector. Should read OL (open). Low resistance means the wire is shorted to ground somewhere in the harness.
4
Verify the 5V reference is present at the harness connector. If missing, check for an open in the reference wire or a short on a shared 5V reference circuit that could pull down other sensors as well.
5
Inspect the harness routing near the fuel tank for damage from road debris, rubbing on tank straps, or corrosion from road salt exposure.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The fuel tank pressure sensor is reading lower than the PCM's minimum expected voltage. This low input typically indicates a grounded signal wire, a failed sensor pulling the signal low, or a loss of 5V reference power. The EVAP system cannot be monitored, and the check engine light will illuminate....
The most common cause of P0452 (Evaporative Emission Control System Pressure Sensor Range/Performance) is: Failed fuel tank pressure sensor with internally shorted element
Typical repair costs for P0452 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The fuel tank pressure sensor low input is an emissions monitoring concern only. No impact on engine performance or vehicle safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0452 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
EVAP / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
