P0453: The evaporative system pressure sensor is sending a voltage that is too high

EVAP pressure sensor high input

Severity: Monitor

TroubleCodes.net says this code usually brings no symptom other than the check engine light, and sometimes a fuel odor, so it is an emissions fault you can book a check for.

It gets more serious if:

Inspect soon: Inspect soon if you smell fuel near the car, since TroubleCodes.net lists a fuel odor as a possible sign.

Source: how we rate severity

P0453 in short

P0453 means the computer sees too high a voltage from the EVAP pressure sensor. Common causes are a failed sensor, a wiring open or short, a corroded connector, or a blocked EVAP hose raising tank pressure. It usually causes only a check engine light, so it is generally safe to drive.

The EVAP system traps fuel vapour and feeds it to the engine. A pressure sensor tells the computer how much pressure or vacuum is in the system. P0453 sets when the signal voltage from that sensor reads higher than it should.

A high reading can be real or electrical. A blocked EVAP hose can trap pressure in the tank, but a faulty sensor, a wire shorted to voltage, an open signal wire, a bad ground or a wet, corroded connector can also make the voltage read high.

General Motors has several bulletins naming P0453: a 2004 Saturn Vue entry, and a 2008-2009 truck and SUV bulletin that covers P0451 to P0455 and replacing the fuel tank pressure sensor/module. Those summaries do not say how often the sensor itself is the fault.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

Cause 1: Faulty EVAP pressure sensor
Common general cause
Why it ranks here
TroubleCodes.net lists the sensor first among the causes of a high-voltage signal, and a GM bulletin covering P0453 prescribes replacing the fuel tank pressure sensor/module.
What would change this
Rises if the sensor reads high with the system vented to the air and the wiring tests good. Falls if the reading drops to normal when the sensor connector is cleaned or the hose is cleared.
How to test the fuel tank pressure sensor
Cause 2: Open, shorted or corroded sensor wiring or connector
Common general cause
Why it ranks here
TroubleCodes.net lists an open or voltage-shorted signal wire, a bad ground and water or corrosion in the connector as ways the computer reads a high voltage.
What would change this
Rises if the connector is wet or green, or the signal wire reads battery voltage with the sensor unplugged. Falls if wiring tests good end to end.
How to test the engine control module (ecm / pcm)
Cause 3: Blocked EVAP hose holding pressure in the tank
Possible — needs testing
Why it ranks here
TroubleCodes.net lists unusually high tank pressure from a blocked EVAP hose, but it is one of several causes and the page does not say how common it is.
What would change this
Rises if the fuel filler hisses or the cap pops when opened. Falls if the hoses flow freely and the sensor still reads high.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

Step 1: Read all stored codes and freeze-frame data with a scan tool and note any other EVAP codes stored with P0453.
Low riskTool: OBD-II scan tool
- IfP0452, P0451 or P0454 are stored too
  It meansThe pressure sensor or its circuit is the common point, so test the sensor first.
  Points to: Faulty EVAP pressure sensor
- IfP0453 is the only EVAP code
  It meansCheck the connector and wiring next.
  Go to step 2
Step 2: With the key off, unplug the EVAP pressure sensor connector and look for water, green corrosion or bent pins, then reconnect it firmly.
Low riskTool: flashlight
- IfWater or corrosion is present
  It meansA bad connection can read high; clean it, clear codes and see whether the code returns.
  Points to: Open, shorted or corroded sensor wiring or connector
- IfThe connector is clean and dry
  It meansHave the signal wire and the sensor tested.
  Go to step 3
Step 3: Have a shop check the sensor signal voltage with the sensor connected and unplugged, and check that the EVAP hoses between the tank, canister and vent are open.
Best left to a shopTool: scan tool with live data, multimeter
Warning:The fuel tank area holds fuel vapour; work away from sparks and flames and never probe fuel system parts with the engine running.
- IfThe signal reads battery voltage with the sensor unplugged
  It meansThe signal wire is shorted to voltage.
  Points to: Open, shorted or corroded sensor wiring or connector
- IfThe wiring is good and the sensor still reads high with the system open to air
  It meansThe sensor is the likely fault.
  Points to: Faulty EVAP pressure sensor
- IfTank pressure is really high and a hose is restricted
  It meansA blocked EVAP hose is holding pressure.
  Points to: Blocked EVAP hose holding pressure in the tank

Symptoms

Check engine light with no change in how the car drives
Fuel smell near the car in some cases Gets more serious: stop and have it checked.

How to fix

Parts and cost context

Fuel tank pressure sensor:On some trucks the sensor is part of the fuel pump module, so a quote should say which part is being replaced. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Saturn

2004 · Vue
Supported by vehicle data
Two 2004 Vue bulletins name P0453 (a service manual update and an SES-light entry); the flat-file summaries do not say the fix.

040604052Status unverified
SES light with P0453 stored
2004vue · issued September 27, 2004 · NHTSA 10009361
Service information for a Vue that sets P0453. The NHTSA summary does not say what the repair is.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
040604018Status unverified
Service manual update for P0452 and P0453
2004vue · issued May 4, 2004 · NHTSA 10006461
A service manual update for the EVAP pressure sensor codes on the 2004 Vue. The NHTSA summary does not give details.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Chevrolet

2008–2009
Supported by vehicle data
A 2008-2009 GM truck and SUV bulletin lists P0453 among EVAP codes and calls for replacing the fuel tank pressure sensor/module.

TB-09-06-04-024 (chevrolet)Status unverified
MIL with EVAP codes including P0453
2008–2009avalanche, silverado-1500, suburban, tahoe · issued August 4, 2009 · NHTSA 10030111
Diagnostic information for EVAP codes P0442 to P0455 and replacement of the fuel tank pressure sensor/module.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

All EVAP (evaporative emissions) codes

Sources and review

P0453 code definition and diagnosis — TroubleCodes.net
GM TB-09-06-04-024: MIL with P0442, P0446, P0451-P0455 and replacement of the fuel tank pressure sensor/module (2008-2009 full-size trucks and SUVs) — General Motors / NHTSA , August 4, 2009
On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
Saturn 040604052: SES telltale with P0453 stored in the PCM (2004 Vue) — General Motors / NHTSA , September 27, 2004
Saturn 040604018: service manual update for P0452 and P0453 (2004 Vue) — General Motors / NHTSA , May 4, 2004

Last reviewed: October 16, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

Severity: Monitor

Most likely causes

Cause 1: Faulty EVAP pressure sensor

Cause 2: Open, shorted or corroded sensor wiring or connector

Cause 3: Blocked EVAP hose holding pressure in the tank

What to test first

Step 1: Read all stored codes and freeze-frame data with a scan tool and note any other EVAP codes stored with P0453.

Step 2: With the key off, unplug the EVAP pressure sensor connector and look for water, green corrosion or bent pins, then reconnect it firmly.

Step 3: Have a shop check the sensor signal voltage with the sensor connected and unplugged, and check that the EVAP hoses between the tank, canister and vent are open.