P00B7 on Chevrolet
Engine Coolant Flow Low/Performance
P00B7 on Chevrolet vehicles indicates engine coolant flow low/performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Cruze. P00B7 means the powertrain control module has determined that coolant flow through the engine's cooling system is too low or not performing as expected. The computer compares signals — typically from the engine coolant temperature sensor and a second temperature sensor (such as the radiator outlet) — and flags this code when the readings indicate coolant isn't circulating properly to manage engine temperature. Restricted flow can let the engine run hotter than designed, risking overheating. The cause is usually a thermostat, water pump, low coolant, or a sensor reading problem. Typical repair costs on Chevrolet range from $40 to $700, depending on the specific model and root cause.
Common Causes of P00B7
- •Stuck or faulty thermostat
- •Low coolant level or air pockets in the system
- •Failing water pump (mechanical or electric)
- •Faulty engine coolant temperature or radiator temperature sensor
- •Clogged radiator, hoses, or coolant passages with sediment/debris
- •Coolant leak reducing system volume
- •Wiring/connector faults at the temperature sensors or PCM control issue
P00B7 on Chevrolet by Model
Chevrolet Cruze(2 issues)
- Coolant Surge Tank Cracking and Pressure Cap O-Ring Failure2011-2019
The plastic coolant surge tank develops hairline cracks, most often at the upper hose nipple where the inner wall splits before the outside shows anything, and the two-stage pressure cap loses its lower O-ring seal. Because the 1.4T cooling system runs high pressure, a weak cap or a cracked tank vents coolant as steam and odor rather than a puddle, which is why owners chase a 'coolant smell but no leak' complaint for months. The resulting chronic low coolant then triggers overheating and low-coolant warnings and gets blamed on the head gasket. This is a separate failure point from the water outlet and thermostat housing.
- 1.4L Turbo Water Pump Shaft Seal / Weep Hole Coolant Leak (Special Coverage 14371B)2011-2015
The engine-driven water pump on the 1.4L turbo (LUJ/LUV) fails at the internal shaft seal, letting coolant escape from the pump's weep reservoir. Because the pump sits low and behind the belt shield, the leak is often first noticed only as a slowly dropping surge-tank level, a sweet smell, or crusty orange residue under the car. Left alone it progresses to steady coolant loss, overheating, and in bad cases coolant migrating past the pump into the belt area. GM acknowledged the pattern in Special Coverage Adjustment 14371/14371B, extending coverage to 10 years / 150,000 miles for 2011-2014 Cruze (and 2012-2014 Sonic) with the 1.4L engine.
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View P00B7 across all makes →Frequently Asked Questions
What does P00B7 mean on Chevrolet?▼
P00B7 stands for "Engine Coolant Flow Low/Performance." P00B7 means the powertrain control module has determined that coolant flow through the engine's cooling system is too low or not performing as expected. The computer compares signals — typically from the engine coolant temperature sensor and a second temperature sensor (such as the radiator outlet) — and flags this code when the readings indicate coolant isn't circulating properly to manage engine temperature. Restricted flow can let the engine run hotter than designed, risking overheating. The cause is usually a thermostat, water pump, low coolant, or a sensor reading problem. On Chevrolet specifically, this code is documented across 1 model.
What causes P00B7 on Chevrolet vehicles?▼
Common causes on Chevrolet: Stuck or faulty thermostat, Low coolant level or air pockets in the system, Failing water pump (mechanical or electric), Faulty engine coolant temperature or radiator temperature sensor, Clogged radiator, hoses, or coolant passages with sediment/debris. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P00B7 on a Chevrolet?▼
Repair costs on Chevrolet range from $40 to $700, depending on the specific model and root cause.
Which Chevrolet models have P00B7 documented?▼
Au7o has documented P00B7 on 1 Chevrolet model: Cruze.