Generic Fault Code

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P00B7

MIL On / Fan High Speed

System

Cooling

Symptom

MIL On / Fan High Speed

Diagnosis & fix steps

LOGIC: Engine Coolant Flow Low / Performance. ACTION: Verify water pump impeller integrity. Compare readings between the radiator outlet temperature sensor and the engine block coolant temperature sensor.

Red Seal field insights

Thermal Physics: The PCM expects a specific delta (temperature difference) between the engine block and radiator exit. If the gap is too narrow, flow is restricted or the thermostat is stuck.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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