P0128 — Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Q: What does fault code P0128 mean?

P0128 means: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). It is a Powertrain (engine/transmission) fault code defined by the OBD-II standard.

Q: Can I keep driving with P0128?

With P0128 you can usually drive home and book an inspection within a few days unless the car feels abnormal.

Powertrain (engine/transmission)

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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Can I drive with P0128?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code P0128 mean?

P0128 means Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature).

Can I keep driving with P0128?

You can usually drive home and book an inspection within a few days.

Related fault codes

P0120 — Throttle/Pedal Position Sensor/Switch A Circuit Malfunction
P0121 — Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
P0122 — Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P0123 — Throttle/Pedal Position Sensor/Switch A Circuit High Input
P0124 — Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
P0125 — Insufficient Coolant Temperature for Closed Loop Fuel Control
P0126 — Insufficient Coolant Temperature for Stable Operation

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