Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble controlling the thermostat that helps keep the engine cool. It's like when a thermostat in your house isn't working right and the temperature gets too hot or too cold.
The P1619 code indicates a problem with the electrical circuit that controls the map cooling thermostat, which is responsible for regulating the engine's temperature.
The P1619 code is triggered when the Engine Control Module (ECM) detects a low voltage or resistance in the map cooling thermostat control circuit. This could mean there is an issue with the wiring, the thermostat itself, or the ECM.
• Check Engine Light illuminated
• Engine overheating
• Poor fuel economy
• Faulty map cooling thermostat
• Damaged or corroded wiring in the thermostat circuit
• Faulty Engine Control Module (ECM)
ECM: Engine Control Module, the computer that manages engine functions.
Thermostat: A device that regulates the engine's temperature by controlling coolant flow.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the map cooling thermostat for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the map cooling thermostat if faulty.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• BMW 3 Series
• Mini Cooper
• Peugeot 207
• Regular maintenance checks on cooling system components.
• Ensure proper coolant levels.
• Inspect wiring for wear and tear regularly.
Sensor Issue
• Do not ignore the Check Engine Light.
• Seek professional help if unsure about repairs.
Check with your vehicle manufacturer for specific warranty coverage related to the cooling system.
This code has been more prevalent in vehicles with advanced cooling systems that use electronic thermostats.
Moderate – It's important to address this issue to prevent engine overheating.
Driving with an overheating engine can cause severe damage and may not be covered under warranty.
• Engine at operating temperature
• Proper coolant levels
The map cooling thermostat is typically located near the engine block, connected to the radiator via hoses.
Q: Can I drive with a P1619 code?
A: It's not recommended to drive for long periods with this code as it can lead to engine overheating.
Q: How can I reset the Check Engine Light?
A: You can reset the light with an OBD-II scanner, but it's important to fix the underlying issue first.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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Fitment Required · Vehicle-fitment part
Relevant when coolant-temperature and warm-up faults indicate a thermostat-related issue.
Coolant-temperature and warm-up faults often lead to thermostat testing and replacement.
Thermostats are vehicle-specific and should be matched by engine and housing style.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.