Trouble Code: P0128 Thermostat Rationality Test Possible Causes: EVAP Purge System Fault Possible Causes: EVAP Small Leak (0.020") Detected Possible Causes: Generator Field Control Circuit Malfunction 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 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 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 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.
HO2S-11 (Bank 1 Sensor 1) No Activity Detected
Fuel System Lean (Bank 2)
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thank you Thomas, hope i can get these figured out!!!
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
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.
engine runs cold
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