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

How do I fix code P00B7?

How To Correct P00B7 Engine Coolant Flow Low/Performance

  1. Ensure that the coolant is filled to a proper level.
  2. Replace the Engine Coolant Temperature sensor and/or Radiator Coolant Temperature Sensor if found faulty.
  3. Replacement of damaged or faulty thermostat.

What does code P00B7 mean?

Engine Coolant Flow Low/Performance

OBD-II Code P00B7 is defined as a Engine Coolant Flow Low/Performance. If the engine computer (PCM) detects large fluctuation in coolant temperature, code P00B7 will be set. Driving with this trouble code is not recommended. A vehicle with this code should be taken in to a repair shop for diagnosis.

Where is coolant temperature sensor?

In most cars, the primary ECT sensor (ECT sensor 1) is installed near the thermostat in the cylinder head or block or on the thermostat housing. A second coolant temperature sensor could be installed in another part of the engine, or in the radiator.

What would cause low coolant flow?

Causes of Coolant Loss

External leaks from radiator hoses, connections between hoses, or from the radiator itself. Radiator cap leaks due to a faulty seal on the cap where the pressurized coolant can leak out. Internal leaks where coolant may leak out of places such as the engine’s head gasket.

What does ECT sensor do?

A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.

How is P0128 diagnosed?

The most common cause for P0128 is the engine coolant thermostat is stuck open. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose.

How do I know if my coolant temperature sensor is bad?

Bad Coolant Temperature Sensor Symptoms

  1. Check Engine Light. …
  2. Poor Mileage. …
  3. Electrical Cooling Fans not coming on. …
  4. Black Smoke from the Exhaust Pipe. …
  5. Difficult Starting Condition. …
  6. Engine Overheats. …
  7. Poor Idling. …
  8. Poor Engine performance.

What problems can a bad coolant temperature sensor cause?

A faulty sensor can cause the fuel mixture to adjust. This causes the engine to shake or vibrate when the vehicle is at low speed and can even bring about strange behaviors, power losses, etc. Engines are highly sensitive, especially to inappropriate air-fuel mixtures at idle.