P3075 on Buick
Engine Coolant Pump Low Current Performance
P3075 on Buick vehicles indicates engine coolant pump low current performance. Au7o has documented this code across 1 Buick model — most commonly on Encore GX. General Motors powertrain code. On engines with an electrically driven or electrically assisted coolant pump, the ECM monitors the current the pump draws as a proxy for how much coolant it is actually moving. P3075 sets when engine coolant pump current falls outside its calibrated range for more than about three seconds — the pump is drawing too little current, which means it is not moving the expected volume of coolant. GM describes the resulting condition as engine coolant flow too low; the pump is often working correctly and the real problem is that it has nothing solid to pump, because the system has lost coolant or has air in it. Typical repair costs on Buick range from $600 to $1,500, depending on the specific model and root cause.
Common Causes of P3075
- •Low coolant level from an external leak
- •Air trapped in the cooling system after a coolant service or a leak, letting the pump cavitate
- •Leaking plastic coolant control valve / integrated water pump assembly or its housing — a known failure point on GM 1.2L/1.3L/2.7L engines
- •Leaking radiator hose connection, thermostat housing or radiator
- •Electrical fault in the coolant pump circuit — wiring, connector or failed pump motor
- •Stuck coolant control valve or restricted coolant passage
- •Faulty ECM (rare)
P3075 on Buick by Model
Buick Encore GX(1 issue)
- Plastic Coolant Control Valve / Water Pump Assembly Failure Causing Overheating (P3075)2020-2024
The three-cylinder turbo cooling system uses an electrically actuated multi-port coolant control valve with a plastic housing and rotor that directs flow between the block, heater core, turbo and radiator circuits. The plastic rotor binds or the housing cracks, and the integrated water pump module can fail alongside it. Because the ECM cannot achieve commanded coolant flow, it sets a coolant-flow-low fault and the engine overheats, typically after 20-25 minutes of continuous driving. Owners describe an erratic temperature gauge that swings before the overheat warning appears. Because the valve sits in a tight three-cylinder bay, labor is a large share of the bill.
Looking for P3075 on a different make?
View P3075 across all makes →Frequently Asked Questions
What does P3075 mean on Buick?▼
P3075 stands for "Engine Coolant Pump Low Current Performance." General Motors powertrain code. On engines with an electrically driven or electrically assisted coolant pump, the ECM monitors the current the pump draws as a proxy for how much coolant it is actually moving. P3075 sets when engine coolant pump current falls outside its calibrated range for more than about three seconds — the pump is drawing too little current, which means it is not moving the expected volume of coolant. GM describes the resulting condition as engine coolant flow too low; the pump is often working correctly and the real problem is that it has nothing solid to pump, because the system has lost coolant or has air in it. On Buick specifically, this code is documented across 1 model.
What causes P3075 on Buick vehicles?▼
Common causes on Buick: Low coolant level from an external leak, Air trapped in the cooling system after a coolant service or a leak, letting the pump cavitate, Leaking plastic coolant control valve / integrated water pump assembly or its housing — a known failure point on GM 1.2L/1.3L/2.7L engines, Leaking radiator hose connection, thermostat housing or radiator, Electrical fault in the coolant pump circuit — wiring, connector or failed pump motor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P3075 on a Buick?▼
Repair costs on Buick range from $600 to $1,500, depending on the specific model and root cause.
Which Buick models have P3075 documented?▼
Au7o has documented P3075 on 1 Buick model: Encore GX.