P00B7

Engine Coolant Flow Low/Performance

Q: Is it safe to drive with P00B7?

Only briefly and carefully. Low coolant flow can let the engine overheat, which causes serious damage — if the gauge climbs into the hot range, stop and let it cool.

Q: Can I just clear P00B7?

Clearing it won't restore coolant flow. The code returns and the engine stays at risk of overheating until the pump, thermostat, or coolant issue is fixed.

Engine cooling Generic OBD-II High

What it means

P00B7 means the engine control module has determined that coolant is not flowing as it should — often from low coolant, a weak or failed water pump, a stuck thermostat, or a blockage. It matters because insufficient coolant flow lets the engine overheat, which can quickly cause expensive damage, so it should be checked before driving far.

High

Can I keep driving? Be careful — this points to poor coolant circulation and a real overheating risk; if the temperature gauge climbs, stop and let it cool rather than pushing on.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Engine temperature rising higher than normal or overheating
Coolant or temperature warning light
Heater may blow cold from poor coolant circulation

Common causes

Most likely first

Low coolant level or trapped air in the cooling systemLikely
Failed or weak water pump (including electric or auxiliary pumps)Common
Thermostat stuck closed or restricting flowCommon
Blockage or restriction in the coolant passages or radiatorLess often
Faulty coolant temperature or flow sensor sending a false readingLess often

How to diagnose & fix

Work through it in order

Check the coolant level and top up or bleed trapped air first; look for leaks.
Verify the thermostat opens and the water pump actually circulates coolant.
Inspect the radiator and hoses for restrictions or collapse.
Confirm the coolant temperature sensor reading matches actual temperature.
Repair the failed component, then clear and retest while watching the temperature.

FAQ

Quick answers

Is it safe to drive with P00B7?+

Only briefly and carefully. Low coolant flow can let the engine overheat, which causes serious damage — if the gauge climbs into the hot range, stop and let it cool.

Can I just clear P00B7?+

Clearing it won't restore coolant flow. The code returns and the engine stays at risk of overheating until the pump, thermostat, or coolant issue is fixed.

Read & clear P00B7 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX