P00B7 on Audi
Engine Coolant Flow Low/Performance
P00B7 on Audi vehicles indicates engine coolant flow low/performance. Au7o has documented this code across 3 Audi models — most commonly on A3, Q2, S7. 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 Audi range from $400 to $3,000, 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 Audi by Model
Audi A3(1 issue)
- Water Pump/Thermostat Housing Coolant Leaks on EA888 Gasoline Engines2016-2025
A very common MQB Audi issue is coolant leakage from the integrated water pump/thermostat housing assembly on EA888 gasoline engines used in the A3 and S3. Owners report gradual coolant loss, sweet smell, visible residue around the pump housing, and in some cases overheating warnings. The failure is typically due to seepage or cracking of the plastic housing and seals rather than a simple hose leak.
Audi Q2(1 issue)
- Coolant / water pump leak on TFSI engines (cracked plastic pump housing)2016-2021
Q2 petrol owners report coolant loss from a leaking water pump at relatively low mileage — one documented 2018 Q2 case at only ~30,000 miles. The EA888/EA211 TFSI family uses an integrated plastic water-pump/thermostat housing that becomes brittle and cracks (commonly at the plastic pipe ports or the shaft seal behind the drive gear), causing seepage or sudden coolant loss. A failing pump bearing can also misalign the pulley. Left unchecked, coolant loss leads to overheating; on belt-driven engines a degraded pump can also threaten timing-belt integrity.
Audi S7(1 issue)
- EA839 2.9T V6 Water Pump Internal Leak and Overheating (C8 S7)2020-2024
The C8 S7 (2020+) abandoned the 4.0T V8 for a 2.9-liter twin-turbo EA839 V6 with a 48V mild-hybrid electric supercharger. The EA839's vacuum-actuated factory water pump has a known mechanical design flaw and is widely described as a 'when, not if' failure, with NHTSA complaints and a class-action lawsuit citing failures well before 50,000 miles. Uniquely dangerous on this pump: it uses engine vacuum to operate a slide valve that controls the impeller, so when the pump leaks internally, coolant gets drawn into the engine's vacuum system, risking far more extensive damage than a simple external coolant leak. Owners report coolant loss, overheating warnings, and in some cases the temperature gauge entering the red zone. The original defective pump uses a 4-bolt pulley; the revised design uses a 6-bolt pulley.
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View P00B7 across all makes →Frequently Asked Questions
What does P00B7 mean on Audi?▼
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 Audi specifically, this code is documented across 3 models.
What causes P00B7 on Audi vehicles?▼
Common causes on Audi: 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 Audi?▼
Repair costs on Audi range from $400 to $3,000, depending on the specific model and root cause.
Which Audi models have P00B7 documented?▼
Au7o has documented P00B7 on 3 Audi models: A3, Q2, S7.