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Engine-Codes – BMW – P1620 BMW

P1620 BMW Code - Map Cooling Thermostat Control Circuit Signal High

Quick Answer

The P1620 code for BMW indicates an issue with the Map Cooling Thermostat Control Circuit Signal being too high. Common causes include Faulty Map Cooling Thermostat, Wiring harness issues, Malfunctioning temperature sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1620 BMW indicates Map Cooling Thermostat Control Circuit Signal High.
Common causes
Common causes include Faulty Map Cooling Thermostat, Wiring harness issues, Malfunctioning temperature sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1620 BMW Description

The P1620 code for BMW indicates an issue with the Map Cooling Thermostat Control Circuit Signal being too high. This thermostat is responsible for regulating the temperature of the intake air that enters the engine, ensuring optimal performance and efficiency. When the signal is too high, it can lead to improper temperature control, affecting the engine's combustion process and overall performance. If not addressed, it can potentially cause engine overheating, reduced fuel efficiency, and increased emissions. The underlying cause of this issue could be a faulty thermostat, wiring issues, or a malfunctioning temperature sensor.

OBDII Code P1620 BMW - Map Cooling Thermostat Control Circuit Signal High
P1620 BMW Code - Map Cooling Thermostat Control Circuit Signal High

Common Causes of P1620 BMW

  1. Faulty Map Cooling Thermostat
  2. Wiring harness issues
  3. Malfunctioning temperature sensor
  4. Electrical system problems
  5. Software glitches in the engine control module

Symptoms of P1620 BMW

  1. Engine overheating
  2. Poor fuel economy
  3. Check Engine light illuminated
  4. Rough idling or stalling
  5. Reduced engine performance

How to Fix P1620 BMW

  1. Begin by diagnosing the root cause of the issue using a diagnostic scanner.
  2. Inspect the Map Cooling Thermostat and its wiring for any visible damage or corrosion.
  3. Test the temperature sensor to ensure it is functioning correctly.
  4. Replace the faulty thermostat, repair any damaged wiring, or replace the temperature sensor as needed.
  5. Clear the error code and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1620 BMW

The typical repair costs for addressing a P1620 code on a BMW can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to consult with a certified mechanic or auto repair shop for an accurate estimate based on your location and vehicle details.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1620 BMW Code

1. What are the common symptoms of OBDII code P1620 in a BMW?

- Common symptoms of OBDII code P1620 in a BMW may include engine overheating, poor fuel efficiency, rough idling, and the check engine light turning on.

2. What causes the OBDII code P1620 Map Cooling Thermostat Control Circuit Signal High in a BMW?

- The OBDII code P1620 in a BMW is typically caused by a malfunction in the map cooling thermostat control circuit, leading to a high signal being detected by the engine control module.

3. How can I diagnose the OBDII code P1620 in my BMW?

- Diagnosing the OBDII code P1620 in a BMW involves using an OBDII scanner to read the code, checking the map cooling thermostat and its wiring for any damage or faults, and testing the circuit for proper voltage and resistance.

4. Can I continue driving my BMW with the OBDII code P1620 present?

- It is not recommended to continue driving your BMW with the OBDII code P1620 present, as it can lead to potential engine damage or overheating issues. It is best to address the issue promptly.

5. What are the possible repair options for fixing the OBDII code P1620 in a BMW?

- Repair options for fixing the OBDII code P1620 in a BMW may include replacing the map cooling thermostat, repairing any damaged wiring or connectors in the circuit, or resetting the fault code after addressing the root cause.

6. How much does it typically cost to repair the OBDII code P1620 in a BMW?

- The cost of repairing the OBDII code P1620 in a BMW can vary depending on the extent of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is advisable to get a few quotes from different mechanics.

7. Can a DIY enthusiast fix the OBDII code P1620 in a BMW?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address the OBDII code P1620 in a BMW by following repair guides or tutorials specific to the issue. However, electrical and cooling system repairs can be complex, so caution is advised.

8. Is the OBDII code P1620 in a BMW a common issue?

- The OBDII code P1620 related to the map cooling thermostat control circuit signal high is not as common as some other OBDII codes, but it can occur in BMW vehicles with this specific system.

9. What is the purpose of the map cooling thermostat in a BMW?

- The map cooling thermostat in a BMW helps regulate the engine temperature by controlling the flow of coolant to the engine, ensuring optimal performance and efficiency.

10. How can I prevent the OBDII code P1620 from appearing in my BMW in the future?

- To prevent the OBDII code P1620 from reoccurring in your BMW, it is important to perform regular maintenance on your cooling system, including checking the thermostat and its associated components for any signs of wear or malfunction.

Discuss the causes and fixes for P1620 BMW OBDII Code

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  • P0340 code can cause P1620 issue. If you solve P0340 issue (admission camshaft position sensor), P1620 code will desapear

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  • Thank you for the information!!

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  • Got an 01 bmw e39 530i and have codes for p1620 p114 camshaft overadvaneced, I just replaced all my coil packs and spark plugs, and maf sensor,cuz my car was running rough , running much better but now I have this p1620 code , can I drive it for sometime before needing to fix?

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