P0597 on Chevrolet Vehicles: Thermostat Heater Control Circuit/Open
The electrically heated thermostat's heater circuit is open, so the ECU can't open it early under heavy load. P0597 →
7Complaints mentioning the code
#1Rank among 2 brands
0.6%Share of Chevrolet DTC complaints
In NHTSA owner complaints we analyzed for Chevrolet, P0597 was mentioned 7 times.
Notes by brand
The 1.4-liter turbo in the Cruze, Sonic and Trax uses an electrically heated thermostat in a plastic housing that is known to leak. Coolant reaching the connector can trigger P0597, so inspect the housing when you find this code.
Most mentioned models
| Chevrolet Volt | 4 | |
|---|---|---|
| Chevrolet Aveo4 | 1 | |
| Chevrolet Cruze | 1 | |
| Chevrolet Sonic | 1 |
Model years mentioned
Components named in these complaints
- Fuel/propulsion System (4)
- Engine (3)
- Power Train (2)
- Electrical System (2)
- Steering (1)
Often appears together with
P0030
Powertrain
The engine computer found a fault in the heater circuit of the upstream air-fuel sensor on bank…
Low
P0031
Powertrain
The upstream sensor heater on bank 1 draws little or no current – usually an open heater…
Low
P0135
Powertrain
The heater inside the upstream oxygen sensor on bank 1 isn't working or its circuit is faulty.
Low
P0443
Powertrain
The ECU detected an electrical fault in the purge solenoid circuit: open, shorted or a bad…
Low
P0458
Powertrain
The purge valve control line reads too low: lost power feed, open coil or a wire shorted…
Low
Possible causes
- Heater element inside the thermostat burned open
- Connector at the thermostat corroded, cracked or contaminated with coolant
- Broken or chafed wire between thermostat and ECU
- Missing supply voltage from a blown fuse or failed main relay feed
Related codes
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.