P0594 — Engine Cooling Thermostat Heater Control Circuit Open

Q: What does fault code P0594 mean?

P0594 means: Engine Cooling Thermostat Heater Control Circuit Open. It is a Powertrain (engine/transmission) fault code defined by the OBD-II standard.

Q: Can I keep driving with P0594?

With P0594 you can usually drive home and book an inspection within a few days unless the car feels abnormal.

Powertrain (engine/transmission)

Engine Cooling Thermostat Heater Control Circuit Open

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Can I drive with P0594?

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

Frequently asked questions

What does fault code P0594 mean?

P0594 means Engine Cooling Thermostat Heater Control Circuit Open.

Can I keep driving with P0594?

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

Related fault codes

P0590 — Cruise Control Vac Solenoid Control Circuit Low
P0591 — Cruise Control Vac Solenoid Control Circuit High
P0592 — Engine Cooling Thermostat Heater Control Circuit Low
P0593 — Engine Cooling Thermostat Heater Control Circuit High
P0595 — Cruise Control Output Circuit Low
P0596 — Cruise Control Output Circuit High
P0597 — Thermostat Heater Control Circuit Open
P0598 — Thermostat Heater Control Circuit Low
P0599 — Thermostat Heater Control Circuit High

Get a full diagnosis for P0594 with AutoUncover.