P0128 on a 2013 Chevrolet Cruze

P0128 means the engine warmed up slower than expected or stayed cooler than the computer expected.

Not your vehicle? See general P0128 info.

Most common causes on the 2013 Chevrolet Cruze

Ranked from 585 NHTSA owner complaints filed for this vehicle.

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1
Coolant Leaks (Hoses, Reservoir, General)
Medium severity
Chronic coolant leaks from various components (reservoir, hoses) lead to low coolant levels, which can trigger temperature-related codes. Pressure test the cooling system and inspect the reservoir and hoses for cracks or leaks.
Reported in 6 NHTSA complaints
2
Failed Water Pump
High severity
The water pump can fail or leak, leading to poor coolant circulation and temperature regulation issues. Inspect the water pump for leaks, bearing play, or failure to circulate coolant.
Reported in 4 NHTSA complaints
3
Blown Head Gasket
High severity
A failed head gasket can cause coolant loss, overheating, and improper engine temperature readings. Check for oil/coolant mixing, white smoke from the exhaust, or combustion gases in the cooling system.
Reported in 4 NHTSA complaints
4
Failed Thermostat / Thermostat Housing
Medium severity
The thermostat housing is prone to failure and leaking, causing the engine to run below or above regulating temperature. Look for coolant leaks around the housing and check for a stuck open thermostat.
Reported in 3 NHTSA complaints
5
Faulty Engine Coolant Temperature (ECT) Sensor
Low severity
A malfunctioning ECT sensor can send incorrect temperature readings to the PCM, falsely triggering the code. Verify sensor resistance against temperature specifications and check wiring.
Common cause
6
Low Coolant Level
Low severity
Insufficient coolant prevents the engine from reaching or maintaining the proper operating temperature, or causes air pockets that affect sensor readings. Check the coolant reservoir and radiator levels.
Common cause

These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0128 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Weak cabin heat
Poor fuel economy
Temperature gauge low
Long warm-up time

What to check before replacing parts

Check coolant level when the engine is cold

Look for: Low coolant reduces the system's ability to reach and hold operating temperature — top off and recheck before assuming the thermostat or sensor is at fault.

Compare scan-tool coolant temperature to actual warm-up time

Look for: An engine that takes noticeably longer than normal to reach operating temperature (or never gets there) on the scan tool, with normal coolant level, points to the thermostat rather than the sensor.

Inspect thermostat operation

Look for: A thermostat stuck open (or opening at the wrong temperature) lets coolant circulate through the radiator too early, keeping the engine running cooler than it should — this is the most common cause of this code.

Check cooling fan command

Look for: A fan that runs constantly or turns on too early (commanded on when temperature is still low) keeps the engine from warming up normally, mimicking a stuck-open thermostat.

Inspect coolant temperature sensor data

Look for: A sensor reading that doesn't rise smoothly with actual engine warm-up, or that reads implausibly low compared to how the engine feels/behaves, points to a sensor or wiring fault rather than a true cooling problem.

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