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IM GETTING CODE PO452 AND PO453 WHAT DO THEY MEAN?

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Code P0452 - Evaporative Emission Control System Pressure Sensor Low Input

From the TSB's...
NOTE: For component location, see COMPONENT LOCATIONS . For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see appropriate WIRING DIAGRAMS article.

NOTE: If Powertrain Control Module (PCM) is replaced, PCM must be reprogrammed. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After each repair procedure has been completed, reconnect all components and perform POWERTRAIN VERIFICATION TEST VER-5 under VERIFICATION TESTS to ensure system is functioning properly.

NOTE: The Natural Vacuum Leak Detection (NVLD) pump system may also be referred to as the Leak Detection Pump (LDP) system. The NVLD Solenoid is an integral part of the NVLD Pump. NVLD Solenoid may also be referred to as the LDP Solenoid, and the NVLD Pressure Switch may also be referred to as the NVLD or LDP Switch.
DTC P0452: NVLD PRESSURE SWITCH STUCK CLOSED
Monitored & Set Conditions
The NVLD Switch is an integral part of the NVLD Pump. The NVLD Switch is monitored immediately after the engine has been started. The PCM activates the NVLD Solenoid. If PCM does not see NVLD Switch open, an error is detected and the DTC sets. This is a one-trip fault. See TRIP DEFINITION under ON-BOARD DIAGNOSTICS.

Possible Causes
? Good Trip Equal To Zero
? NVLD Switch Operation
? NVLD Pump
? Evaporative Emission (EVAP)/Proportional Purge Solenoid Leaks/Stuck Open
? EVAP Purge Solenoid Control Circuit Shorted To Ground
? NVLD Switch Signal Circuit Shorted To Ground
? PCM

Testing
1.Turn the ignition on, with the engine off. With the DRBIII(R), read DTCs and record the related Freeze Frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT FAILURES under ON-BOARD DIAGNOSTICS. 2.Turn the ignition off. Disconnect the EVAP Purge Solenoid harness connector. The EVAP Purge Solenoid may also be referred to as the Proportional Purge Solenoid. Turn the ignition on, with the engine off. Using a 12-volt test light, jump across the EVAP Purge Solenoid harness connector. With the DRBIII(R), actuate the EVAP Purge Solenoid. Does the test light flash on and off? If yes, stop all actuations and go to next step. If no, stop all actuations and go to step 7 .
NOTE: After disconnecting the EVAP Purge Solenoid vacuum hoses, inspect the hoses and solenoid for any signs of contamination from the EVAP Canister. This may indicate a faulty rollover valve. Repair/replace as necessary.
3.Turn the ignition off. Reconnect the EVAP Purge Solenoid harness connector. Disconnect the vacuum hoses at the EVAP Purge Solenoid. Using a hand vacuum pump, apply 10 in. Hg to the EVAP Canister side of the EVAP Purge Solenoid. Monitor the vacuum gauge for at least 15 seconds. Does the EVAP Purge Solenoid hold vacuum? If yes, go to next step. If no, replace the EVAP Purge Solenoid.
4.Turn the ignition on, with the engine off. Using the DRBIII(R), monitor the NVLD Switch State. Does the DRBIII(R) display the NVLD state OPEN? If yes, see INTERMITTENT FAILURES under ON-BOARD DIAGNOSTICS. If no, go to next step.
5.Turn the ignition off. Using the DRBIII(R), monitor the NVLD Switch State. Disconnect the NVLD Pump harness connector. Does the Switch change from CLOSED to OPEN? If yes, replace the NVLD Pump. If no, go to next step.
6.Disconnect the PCM harness connectors. Measure the resistance between ground and the NVLD Switch Signal circuit in the NVLD Pump harness connector. Is the resistance less than 5.0 ohms? If yes, repair the short to ground in the NVLD Switch Signal circuit. If no, check the PCM harness connector terminals for corrosion, damage or terminal push-out. Repair as necessary. If connector is okay, replace the PCM.
7.Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the EVAP Purge Solenoid Control circuit at the EVAP Purge Solenoid harness connector. Is the resistance less than 5.0 ohms? If yes, repair the short to ground in the EVAP Purge Solenoid Control circuit. If no, check the PCM harness connector terminals for corrosion, damage or terminal push-out. Repair as necessary. If terminals are okay, replace the PCM.


Code P0453 Fuel Tank Pressure Sensor.
Check the wires between the pcm and the fuel tank pressure sensor.At the sensor with it disconnected (key on) you should have ground on the black wire and 5 volts on the gray wire.

Posted on May 16, 2010

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1 Answer

What is code po453 on my 99 chevy suburb mean??with engine light on...???


code p0453 refers to evaporative emission (EVAP) pressure sensor-- high out put === causes wiring short to positive--- EVAP pressure sensor--- ECM
I would change the sensor unless you have been messing with the wires.

May 01, 2015 | Cars & Trucks

1 Answer

Sensor codes


http://www.obd-codes.com/p0453.....
http://www.obd-codes.com/p0452

http://www.obd-codes.com/p0420
This is what the codes mean.

Your carburetor and fuel system is acting up (or you lost the fuel cap!)
You need a carburetor and engine service. This is not a user friendly problem!

Mar 09, 2014 | 1998 GMC Safari

1 Answer

WHAT DOES THIS CODE MEAN PO4053


P0440 is the (PCM) and yout (EVAP) So look for a leak on the purge system. The P0453 is the same thing

Apr 02, 2013 | 2001 GMC Jimmy

2 Answers

Abs light on with a p0452 code


ABS -- is one problem
Possible Wheel Speed Sensor ,but
you can't guess Use codes & other
resouces to diagnose

EVAP System Code PO452 -- may be a
Pressure Sensor issue ,all I have is Low Input
I assume that means high resistance in the solenoid coil,
thus low voltage detected
Again- need scanner & evap smoke machine ,to check out,
unless your guy shot guns common items & gets lucky at
your expense,changing parts

Aug 04, 2011 | 2000 Chevrolet Blazer

1 Answer

What is the codes means po452 and po453


Hi,

The codes indicate a problem with the fuel tank pressure sensor. One code is for no volts, the other is for high volts. Without a scanner hooked up to monitor. I have to go with you have a bad fuel tank pressure sensor. this is an emissions control sensor. the tank is pressurized and the sensor monitors it for leaks etc. the tank must come out as it is mounted on top of fuel pump module

REMOVAL PROCEDURE

  1. Raise the vehicle.
  2. Remove the fuel tank. Refer to Fuel Tank .
  3. Remove the fuel tank vapor pressure sensor electrical connector.
  4. Remove the fuel tank pressure sensor.
INSTALLATION PROCEDURE
  1. Install the fuel tank vapor pressure sensor.
  2. Install the fuel tank vapor pressure sensor electrical connector.
  3. Install the fuel tank. Refer to Fuel Tank .
  4. Lower the vehicle.
Thanks.

Feb 02, 2011 | 2001 Chevrolet Blazer

2 Answers

Check engine light


Code PO442 means you have a small leak in your evap system. Codes PO452 & PO453 refer specifically to the fuel thank.

Although it will be a good idea to change your gas cap, I don't think it is where your problem is coming from.

I would check the vacumm hoses for loose fitting or small cracks.

Specially if you had your car worked on recently.

Good luck

Mar 09, 2010 | 2000 Buick Park Avenue

2 Answers

Codes po452 and po453


both codes point to the fuel tank evap pressure sensor. High and low input faults.
Try clearing the codes first and seeing if they come back

You may have a vacuum leak, cracked or open vacuum line or faulty sensor.

Dec 21, 2009 | 2001 Chevrolet Blazer

1 Answer

Emmisions codepo442,po446,po452,po453


Hi there,

These codes are for the fuel system the system performs a pressure test when the vehicle reaches a certain speed for a certain period of time, predetermined from the factory. The Gas cap is the most likely suspect.  Disconnecting battery will reset (and delete) all error codes and clear the check engine light, VSC, etc. idiot lights on the dash.

Post further comments if further you have the same problem....

Good Luck!!

Thanks

Dec 12, 2009 | 2000 Oldsmobile Bravada

1 Answer

Turned car off at gas station want start back acts like missin


all of these problem codes refer to EGR valve and emission controls. It may be, if egr was fixed, it would be ok!! take off EGR valve and clean carbon from egr hole in engine and from EGR valve. if egr valve is bad or plugged with carbon then the car will act like it is not getting fuel, it will bog down.

Jan 07, 2009 | 1998 Chevrolet Malibu

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