P0599 on Dodge
Thermostat Heater Control Circuit High
P0599 on Dodge vehicles indicates thermostat heater control circuit high. Au7o has documented this code across 1 Dodge model — most commonly on Caliber. This code relates to the engine cooling system's thermostat heater control circuit, used on engines with an electrically heated (map-controlled) thermostat that the computer can open early to fine-tune coolant temperature. The 'high' designation means the computer detected the control circuit voltage was higher than expected, indicating an electrical fault such as a short to voltage or an open circuit. It is generally an electrical/wiring problem rather than a mechanical cooling failure. It can affect how precisely the engine manages its operating temperature and fuel economy. Typical repair costs on Dodge range from $100 to $800, depending on the specific model and root cause.
Common Causes of P0599
- •Faulty electronically heated thermostat element/heater
- •Short to voltage in the heater control circuit
- •Open or damaged wiring/connector
- •Corroded or loose connector at the thermostat
- •Poor electrical ground
- •Faulty PCM/ECM driver (less common)
P0599 on Dodge by Model
Dodge Caliber(1 issue)
- Engine Overheating - Multiple Causes2007-2012
Calibers are prone to overheating from radiator fan failure, thermostat sticking, water pump failure, and radiator clogging. Same cooling system shared with Jeep Compass/Patriot (PM/MK platform). Fan relay failure is the most common single cause.
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View P0599 across all makes →Frequently Asked Questions
What does P0599 mean on Dodge?▼
P0599 stands for "Thermostat Heater Control Circuit High." This code relates to the engine cooling system's thermostat heater control circuit, used on engines with an electrically heated (map-controlled) thermostat that the computer can open early to fine-tune coolant temperature. The 'high' designation means the computer detected the control circuit voltage was higher than expected, indicating an electrical fault such as a short to voltage or an open circuit. It is generally an electrical/wiring problem rather than a mechanical cooling failure. It can affect how precisely the engine manages its operating temperature and fuel economy. On Dodge specifically, this code is documented across 1 model.
What causes P0599 on Dodge vehicles?▼
Common causes on Dodge: Faulty electronically heated thermostat element/heater, Short to voltage in the heater control circuit, Open or damaged wiring/connector, Corroded or loose connector at the thermostat, Poor electrical ground. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0599 on a Dodge?▼
Repair costs on Dodge range from $100 to $800, depending on the specific model and root cause.
Which Dodge models have P0599 documented?▼
Au7o has documented P0599 on 1 Dodge model: Caliber.