Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that helps control the engine's temperature. It's like when your home thermostat isn't working right, and it can't keep the house warm or cool.
The P1622 code indicates an issue with the electrical circuit that controls the map cooling thermostat, which is responsible for managing engine temperature.
The P1622 code is triggered when the Engine Control Module (ECM) detects a malfunction in the map cooling thermostat control circuit. This could be due to an open or short circuit, or a failure in the thermostat itself. The map cooling system is designed to optimize engine temperature for performance and emissions.
• Check Engine Light is on
• Engine overheating
• Poor fuel economy
• Faulty map cooling thermostat
• Damaged wiring or connectors in the thermostat circuit
• Faulty Engine Control Module (ECM)
ECM: Engine Control Module, the computer that controls engine functions.
Thermostat: A device that regulates engine 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.
• Replace the map cooling thermostat if faulty.
• Repair or replace damaged wiring or connectors.
• Update or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• BMW 3 Series
• BMW 5 Series
• Mini Cooper
• Regular maintenance checks of the cooling system.
• Ensure proper coolant levels.
• Check for leaks or damage in the cooling system.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle checked by a professional if you're unsure.
• Monitor engine temperature gauge for unusual readings.
Check with your vehicle manufacturer for specific warranty coverage related to engine components.
This code has been more common in vehicles with advanced cooling systems, especially in European models.
Moderate – It should be addressed soon to prevent engine overheating.
Ignoring this issue can lead to engine damage, which may not be covered under warranty if neglected.
• Engine at operating temperature
• Vehicle stationary
The map cooling thermostat is typically located near the engine block or cylinder head.
Q: Can I drive with a P1622 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to engine overheating.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code after repairs are completed.
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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.