P0598 on Skoda
Thermostat Heater Control Circuit Low
P0598 on Skoda vehicles indicates thermostat heater control circuit low. Au7o has documented this code across 2 Skoda models — most commonly on Octavia, Superb. This code applies to engines with an electronically controlled (heated) thermostat and means the Powertrain Control Module detected an abnormally low voltage in the thermostat heater control circuit. The heater element lets the computer fine-tune coolant temperature for efficiency and emissions by opening the thermostat sooner under certain conditions. P0598 sets when the control or feedback circuit reads lower than expected (often a short to ground or loss of supply). It is found mainly on certain European makes (BMW, Mercedes, VW/Audi, etc.) and usually has little effect on driving. Typical repair costs on Skoda range from $250 to $950, depending on the specific model and root cause.
Common Causes of P0598
- •Faulty electronically controlled (map-controlled) thermostat
- •Short to ground in the heater control wiring
- •Corroded or loose thermostat connector
- •Open or damaged wiring in the control circuit
- •Low coolant level overheating the thermostat heater
- •Blown fuse or poor power supply to the circuit
- •Faulty PCM control driver
P0598 on Skoda by Model
Skoda Octavia(1 issue)
- 1.4 TSI (EA211) plastic water-pump / thermostat housing coolant leak2013-2020
The 1.4 TSI EA211 engine (Mk3, 2013-2020) commonly leaks coolant from the combined water-pump/thermostat module, which has plastic components and a plastic impeller that degrade and crack. Owners report coolant residue under the car, low-coolant warnings, fluctuating temperature gauge and overheating risk, typically between roughly 40,000 and 80,000 miles. The pump and thermostat live in one housing and either part can fail. Documented extensively on Briskoda and SeatCupra forums.
Skoda Superb(1 issue)
- EA888 Plastic Water Pump and Thermostat Housing Failure2008-2020
Mk2 and Mk3 Superb with EA888 1.8/2.0 TSI engines suffer the same plastic water pump and thermostat housing failure as VW/Audi siblings. The plastic body cracks, causing coolant leaks. Often happens around 80,000-120,000 mi.
Looking for P0598 on a different make?
View P0598 across all makes →Frequently Asked Questions
What does P0598 mean on Skoda?▼
P0598 stands for "Thermostat Heater Control Circuit Low." This code applies to engines with an electronically controlled (heated) thermostat and means the Powertrain Control Module detected an abnormally low voltage in the thermostat heater control circuit. The heater element lets the computer fine-tune coolant temperature for efficiency and emissions by opening the thermostat sooner under certain conditions. P0598 sets when the control or feedback circuit reads lower than expected (often a short to ground or loss of supply). It is found mainly on certain European makes (BMW, Mercedes, VW/Audi, etc.) and usually has little effect on driving. On Skoda specifically, this code is documented across 2 models.
What causes P0598 on Skoda vehicles?▼
Common causes on Skoda: Faulty electronically controlled (map-controlled) thermostat, Short to ground in the heater control wiring, Corroded or loose thermostat connector, Open or damaged wiring in the control circuit, Low coolant level overheating the thermostat heater. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0598 on a Skoda?▼
Repair costs on Skoda range from $250 to $950, depending on the specific model and root cause.
Which Skoda models have P0598 documented?▼
Au7o has documented P0598 on 2 Skoda models: Octavia, Superb.