Question about 2002 Dodge Intrepid

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Engine codes PO 128, PO 440, PO 456 and PO 622

Posted by Suzanne Heine on

  • 2 more comments 
  • Suzanne Heine Nov 25, 2012

    thank you Thomas, hope i can get these figured out!!!

  • Suzanne Heine Nov 25, 2012

    also Thomas when i started my cat the battery light came on, this is the 1st time it did this, thats when the PO 128 and PO 622 codes came on, the other 2 have been on there

  • Thomas Perkins
    Thomas Perkins Nov 26, 2012

    Hi Suzanne,these 2 codes that you said that came on with light are,go check your coolant level,add if low,if okay,then your thermostat is bad,need to change,do you know how,if so let me know and I will send you a guide on how to replace and on the other code,Your alternator may be going out,you can go to Autozone and they will check for free,takes a few minutes.

  • Anonymous Mar 23, 2014

    engine runs cold

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Thomas Perkins

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  • Dodge Master
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Trouble Code: P0128

Thermostat Rationality Test

Possible Causes:


Check the operation of the thermostat (it may be stuck open).ECT Sensor is contaminated, damaged or it has failed.Inspect for low coolant level or for an incorrect coolant mixture.Trouble Code: P0440

EVAP Purge System Fault

Possible Causes:


EVAP purge valve vacuum supply is leaking or clogged.EVAP purge valve is stuck closed.EVAP purge solenoid has failed.NVLD assembly (leak detection) is damaged or has failed.NVLD switch circuit is open or the NVLD switch has failed.Ground circuit is open.PCM has failed.Trouble Code: P0456

EVAP Small Leak (0.020") Detected

Possible Causes:


.EVAP fuel tank or canister vapor hoses leaking or damaged.EVAP system component leaking, fuel cap loose or missing.Leak detection pump damaged or leaking.Trouble Code: P0622

Generator Field Control Circuit Malfunction

Possible Causes:


Generator field control circuit is open or is shorted to ground.Generator field control circuit is shorted to system power (B+).Generator field ground circuit is open.Generator is damaged or PCM has failed.PCM has failed.Here are the codes and causes.

Posted on Nov 25, 2012

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login to alldata.com
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