Parts
$30–100
P0453 — EVAP Pressure Sensor Circuit High
SAFEIs it safe to drive? FTP sensor signal is stuck high — emissions fault, safe to drive normally.
What P0453 means
The fuel tank pressure sensor is reporting a voltage above the expected maximum (typically above 4.8V). This is the inverse of P0452 — usually a broken wire, open circuit, or sensor with an internal open that pulls the signal high.
Most likely causes (in order)
- Open circuit in the signal wire (broken wire or connector pin)
- Sensor connector disconnected or heavily corroded
- FTP sensor failed with an open internal element
- Reference voltage wire shorted to signal wire
- Wiring harness damaged from road debris near the tank
Symptoms you might notice
- CEL on
- EVAP monitor failing
- no driveability symptoms
What to check first
Backprobe the sensor signal pin with a multimeter — if you read near 5V with the sensor connected and engine running, unplug the sensor; if voltage drops to near 0V, the sensor is open internally. If it stays at 5V with sensor unplugged, the signal wire is shorted to the 5V reference.
Repair cost & difficulty
Labor
0.5–2 hr
Difficulty
Moderate