P0597: Thermostat Heater Control Circuit Open
11 vehicles · 8 makes · $60-$1,800 repair
Most Reported On
P0597 is an OBD-II diagnostic trouble code meaning “Thermostat Heater Control Circuit Open.” P0597 is a cooling-system code indicating an open electrical circuit in the control for the heated (electronically controlled) engine thermostat. Many modern engines use a thermostat with a built-in heater element that the computer can energize to open the thermostat sooner for better temperature management and emissions. When the PCM commands that heater but detects no electrical continuity (an open circuit), it sets this code. It generally means the thermostat heater isn't being controlled, which can affect coolant temperature regulation, fuel economy, and emissions. This code is most commonly reported on 2007-2016 MINI Cooper, 2007-2017 Jeep Patriot, and 2016-2023 Chevrolet Camaro, plus 8 other vehicles, with repair costs ranging from $60 to $1,800.
Common Causes
Typical Repair Cost
Based on 12 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0597, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (11)
Thermostat Housing Coolant Leak / Cracking
Engine Overheating / Water Pump and Radiator Fan Failure
Thermostat Housing Coolant Leak
Engine Overheating / Cooling System Failures
FAQ
What does P0597 mean?
P0597 stands for "Thermostat Heater Control Circuit Open." P0597 is a cooling-system code indicating an open electrical circuit in the control for the heated (electronically controlled) engine thermostat. Many modern engines use a thermostat with a built-in heater element that the computer can energize to open the thermostat sooner for better temperature management and emissions. When the PCM commands that heater but detects no electrical continuity (an open circuit), it sets this code. It generally means the thermostat heater isn't being controlled, which can affect coolant temperature regulation, fuel economy, and emissions.
What are the most common causes of P0597?
The most common causes of P0597 are: Failed thermostat heater element or integrated control thermostat, Open or broken wiring to the thermostat heater circuit, Corroded, loose, or disconnected thermostat connector, Blown fuse or open in the heater power feed, Poor ground or control-circuit fault from the PCM, Damaged PCM driver for the heater (rare). The specific cause varies by vehicle.
How much does it cost to fix P0597?
Repair costs for P0597 range from $60 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by P0597?
Au7o has documented P0597 across 11 vehicle models from 8 manufacturers: BMW, Chevrolet, Dodge, Jeep, MINI, Mercedes-Benz, Skoda, Volkswagen.
Sources (12)
- ForumJeepPatriot.com - Thermostat Housing Discussion
- newsMyJeepPatriot.com - Common Problems and Solutions
- partOEM Thermostat Housing Assembly 68003582AB
- NHTSACarComplaints.com - 2006 Commander Engine & Cooling (173 complaints)
- mediaDodge Caliber Overheating - 700R4TransmissionHQ
- mediaDodge Caliber Running Hot - 700R4TransmissionHQ
- ForumOverheating issue needing help - Dodge Caliber Forums
- ForumWheres the radiator fluid going - Dodge Caliber Forum
- Forum1.4 TSI Coolant Leak From Water Pump - Skoda Octavia Mk3 - BRISKODA
- ForumGuide to replacing the thermostat/water pump unit on the 1.4 TSI CZEA engine - SEATCUPRA.NET
- articleSkoda Octavia (2013-2020) Review - Honest John
- articleVW EA888 Water Pump Failure Explained - Mechalex
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.