P0597 on MINI: How to Diagnose & Fix
Thermostat Heater Control Circuit Open
1 MINI model · 1 documented issue · 1 critical · $400-$1,200 repair
P0597 on MINI by model: symptoms, diagnosis and fix
Both R56 and early F56 Coopers use an electric thermostat housing and electric water pump that are prone to premature failure. The thermostat housing cracks causing coolant leaks, and the water pump impeller can fail leading to overheating.
Common Symptoms
- Coolant warning light
- Overheating
- Coolant puddle under car
- Heater blowing cold air
- Temperature gauge fluctuation
How to Fix
Replace thermostat housing assembly and/or electric water pump. Use updated MINI parts. The thermostat housing is on the front of the engine and relatively accessible. Water pump is belt-driven on N12/N16, electric on newer B38/B48.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Saleri MINI water pump 11517648827OEMSaleri PA1425 / MINI 11517648827
Confirm VIN, engine and current interchange before purchase; this is not an el
- Mahle MINI thermostat assembly 11538699290OEMMahle TM57105 / MINI 11538699290
R56 N12/N14 and VIN-confirmed N16 thermostat-housing branch Fitment/availability: The inspected direct U.S. Confirm VIN, engine, production date and connector; do not use for an N18 or
- Rein MINI thermostat housing 11538674895OEMRein CTA0051 / MINI 11538674895
R56 N18 and VIN-confirmed later N16 thermostat-housing branch Fitment/availability: The inspected direct U.S. Use only after VIN, engine and connector verification confirms the N18-style branch; do not infer it from
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P0597 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0597 mean on a MINI?
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. On MINI it is documented across 1 model: Cooper.
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 on a MINI?
Published repair estimates on MINI range from $400 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0597 on a different make?
View P0597 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.