code 440 and 441 also car will not go into overdrive
transmission fluid was recently changed however car still would not go into overdrive.I also have engine
light on codes are 440 and 441
Symptom: P0440- EVAP EMMISSION CONTROL SYSTEM MALFUNCTION POSSIBLE CAUSES: The gas cap is not installed or working properly The purge solenoid has failed The canister is plugged and not working properly Try a new gas cap Symptom: P0441-EVAP PURGE SYSTEM PERFORMANCE POSSIBLE CAUSES NVLD SWITCH OPERATION CHECKING EVAP PURGE SOLENOID FUNCTIONALITY EVAP PURGE SOLENOID VACUUM SUPPLY VERIFY NVLD OPERATION Check the NVLD (Natural Vacuum leack dectector) Switch it might fix the overdrive issue you have
Evap codes could be the fuel cap, but replacing the cap may not be the solution. Evap system diagnostics will need to be performed by a garage with the proper smoke testing equipment to resolve these codes if replacing the gas cap didn't work. These codes don't have anything to do with the transmission problem you are having. These are two separate issues. Replacing the fluid will not fix a mechanical problem... If anything, changing the transmission fluid because there are problems with the transmission means that the fluid change came too late, the transmission fluid should have been serviced much sooner. There could be an issue with the valve body or something else... A transmission shop should be able to figure it out.
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