2022 Buick P0128: What It Means & Is It Safe to Drive?
P0128 on the 2022 Buick: Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainLow urgency
What this code means
The engine is not reaching normal operating temperature in the expected time. Usually a stuck-open thermostat.
Common causes on the 2022 Buick
- Thermostat stuck open
- Coolant temperature sensor fault
- Low coolant level
Symptoms
- Check Engine Light
- Heater may blow cold
- Poor fuel economy
- Temperature gauge stays low
Typical fixes
- Replace thermostat
- Replace coolant temperature sensor if faulty
- Refill coolant and check for leaks
Repair cost range
For a 2022 Buick, repairs for P0128 typically fall between $100 and $350, depending on the root cause and labor rates in your area.
Known issues on Buick
Buick P0128 on the 3.6L LFX and 2.4L Ecotec mirrors the same thermostat housing issues seen in Chevrolet. The map-controlled thermostat and plastic housing on the Ecotec 2.4L can fail as a unit.
Most commonly affected models
LaCrosse 2010–2016Enclave 2008–2017Verano 2012–2017