I asked this on the HPTuners forum but didn't really get a response. HPT reported these DTC's on an 02 Impala. I understand the first part which describes the offending sensor. My question is: what do the descriptions in parentheses mean? What causes them?

Thanks!


P0128 - Coolant Thermostat (SES) (Old) (History) (Immature)
P1189 - Engine Oil Pressure (EOP) Switch Circuit (Pending) (Old) (History) (Current) (Immature)

 

Please?

 

C'mon. This can't be that uncommon of a question/answer.

 

not 100% sure but:

P1xxx is a manufacturer code (so I'm guessing that's why it wouldn't say SES)

Pending means it's been detected, and it's waiting to see if the error occurs again
Old means the PCM detected it once but hasn't seen the behavior again
History means that it's not an active SES
Immature means that there necessary number of failures has not yet occurred
Current means it's been recently detected

I'm pretty sure that's what they all mean... I've never really paid attention to it... I just clear the codes, and if they come back then I have a problem and fix it

 

Thanks, Mike!