My fiance and I replaced the water pump and put a 180* thermostat in and my check engine light came on with this PO128 code? Anyone know what it is?

 

You should check coolant level, Bleed air out ..



A code P0128 may mean that one or more of the following has happened:
1)Low engine coolant level
2) Leaking or stuck open thermostat Faulty cooling fan (running too much
3) Faulty coolant temperature (ECT) sensor
4)Faulty intake air temperature (IAT) sensor

 

Is it because of the 180* thermostat?

 

Have you had your PCM tuned to accept a 180* tstat? If not, I would put money on that being the problem. IIRC stock tstats are 195*.

 

No, I havent had it tuned to accept a 180* tstat. I want get the ZZP 1.0 PCM anyway, so I'll just save up for that to be my next mod