OBD-II Trouble Codes

P00B7 Code: Engine Coolant Flow Low / Performance

Reading Time: 3 minutes

An OBD-II code is designed to alert you of the potential problems your car may have. To resolve it, you must first know what the logged code entails. If you’re finding it difficult to figure out what code P00B7 means, you’ve come to the right place. Read on to learn about its possible triggers and common symptoms.

What Does the P00B7 Code Mean?

Diagnostic trouble code (DTC) P00B7 stands for “Engine Coolant Flow Low/Performance.” This code is logged when the powertrain control module (PCM) perceives insufficient coolant flow through the cooling system.

coolant flow
Code P00B7 may register if the PCM perceives insufficient coolant flow through the cooling system.

This trouble code is set when the correlating signals between the engine coolant temperature (ECT) sensor and the radiator coolant temperature sensor (or secondary engine coolant temperature sensor) exceed the allowable threshold. The PCM perceives this discrepancy in signals as the result of a low or restricted engine coolant flow.

The PCM monitors both sensors to determine if there is sufficient coolant flow to keep the engine at operating temperature.

When the PCM concludes that the coolant flow is too low because of this huge difference in temperature between the ECT sensor and the radiator coolant temperature sensor, the radiator fan(s) may be set to high. The PCM does this to prevent the overheating of the engine.

Note: The definition of code P00B7 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P00B7 Code?

Here are some common triggers of the error code P00B7:

water pump
A faulty water pump can trigger code P00B7.

What are the Common Symptoms of the P00B7 Code?

You may notice the following symptoms if you drive a car that has a logged P00B7 error code:

How to Diagnose the P00B7 Code

To avoid complications, code P00B7 should be resolved immediately. However, diagnosing this code can be a struggle, as it has many possible triggers. To make sure you’re on the right path, the diagnostic and repair steps should always depend on the specifications of your vehicle.

Because all cars are built differently, they would also require different diagnoses. A P00B7 on a Chevy, for instance, may require a different diagnosis process from a P00B7 on a Honda. Refer to a repair manual specific to your vehicle for the appropriate automotive diagnostic steps.

However, if you feel like your automotive know-how is lacking, it would be best to let the professionals handle the diagnosis of this trouble code instead.

temperature gauge
An abnormal temperature gauge reading is a common symptom of the P00B7 code.

How to Fix the P00B7 Code

The P00B7 code may share similar triggers and symptoms with other DTCs. However, that does not mean it also shares their fixes. All vehicles are different, so you should always refer to the factory repair information specific to your car before DIY-ing any repairs.

Consult a repair manual or repair database before attempting any fixes. Look for confirmed solutions that are specific to your vehicle. If you aren’t confident in your automotive repair skills, it may be best to enlist the help of a professional.

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