P0746 on Buick
Pressure Control Solenoid Performance/Stuck Off
P0746 on Buick vehicles indicates pressure control solenoid performance/stuck off. Au7o has documented this code across 1 Buick model — most commonly on Regal. P0746 means the transmission's pressure control solenoid 'A' is performing poorly or appears stuck in the off (low pressure) position. This solenoid regulates hydraulic line pressure that applies clutches and bands to make smooth, firm shifts; the TCM detects when commanded pressure changes aren't producing the expected response. A stuck-off condition typically means line pressure stays low. You may experience slipping, soft or delayed shifts, harsh engagement, overheating, or the transmission entering limp mode. Typical repair costs on Buick range from $150 to $5,500, depending on the specific model and root cause.
Common Causes of P0746
- •Low, dirty, or degraded transmission fluid
- •Faulty pressure control / EPC solenoid
- •Clogged valve body passages or stuck valve
- •Wiring or connector fault at the solenoid
- •Internal transmission wear (worn clutches, leaking seals)
- •Dirty or clogged transmission filter
- •Faulty transmission control module (less common)
P0746 on Buick by Model
Buick Regal(1 issue)
- Regal Aisin AF40 6-Speed Harsh Shifts / Shudder2011-2017
The Aisin AF40 6-speed automatic in 2011-2017 Regal (and 2010-2017 LaCrosse 4-cyl, 2008-2017 Opel Insignia A) develops harsh 1-2 and 2-3 shifts, torque-converter shudder at light throttle, and delayed engagement, usually 80,000-150,000 miles. GM's "lifetime fill" claim is widely disputed by independent shops.
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View P0746 across all makes →Frequently Asked Questions
What does P0746 mean on Buick?▼
P0746 stands for "Pressure Control Solenoid Performance/Stuck Off." P0746 means the transmission's pressure control solenoid 'A' is performing poorly or appears stuck in the off (low pressure) position. This solenoid regulates hydraulic line pressure that applies clutches and bands to make smooth, firm shifts; the TCM detects when commanded pressure changes aren't producing the expected response. A stuck-off condition typically means line pressure stays low. You may experience slipping, soft or delayed shifts, harsh engagement, overheating, or the transmission entering limp mode. On Buick specifically, this code is documented across 1 model.
What causes P0746 on Buick vehicles?▼
Common causes on Buick: Low, dirty, or degraded transmission fluid, Faulty pressure control / EPC solenoid, Clogged valve body passages or stuck valve, Wiring or connector fault at the solenoid, Internal transmission wear (worn clutches, leaking seals). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0746 on a Buick?▼
Repair costs on Buick range from $150 to $5,500, depending on the specific model and root cause.
Which Buick models have P0746 documented?▼
Au7o has documented P0746 on 1 Buick model: Regal.