P0700 on Buick
Transmission Control System Malfunction
P0700 on Buick vehicles indicates transmission control system malfunction. Au7o has documented this code across 1 Buick model — most commonly on Encore GX. P0700 is a general code indicating the transmission control module (TCM) has detected a fault somewhere in the transmission control system and has requested the check engine light be turned on. By itself it doesn't pinpoint the problem — it's an 'umbrella' code that tells you to look for additional, more specific transmission codes stored alongside it. The actual fault could be electrical, a sensor, a solenoid, or an internal transmission issue. You may notice harsh or delayed shifts, slipping, or the transmission going into a protective 'limp' mode.
Common Causes of P0700
- •Stored companion transmission codes pointing to the real fault
- •Faulty shift solenoid or pressure control solenoid
- •Low, dirty, or degraded transmission fluid
- •Faulty transmission speed or input/output sensor
- •Wiring, connector, or ground problems at the transmission
- •Failing transmission control module (TCM)
- •Internal transmission mechanical wear or clutch problems
- •Valve body fault or sticking valves
P0700 on Buick by Model
Buick Encore GX(1 issue)
- Encore GX CVT / 9-Speed Hesitation and Shudder2020-2024
The 2020+ Encore GX uses either the VT40 CVT (FWD 1.2L) or the GM 9T50 9-speed (AWD 1.3L). Both have reported issues: CVT hesitates from a stop, jerks on tip-in, and growls. 9-speed has been the subject of multiple TSBs covering harsh shifts, flares, and torque converter shudder.
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View P0700 across all makes →Frequently Asked Questions
What does P0700 mean on Buick?▼
P0700 stands for "Transmission Control System Malfunction." P0700 is a general code indicating the transmission control module (TCM) has detected a fault somewhere in the transmission control system and has requested the check engine light be turned on. By itself it doesn't pinpoint the problem — it's an 'umbrella' code that tells you to look for additional, more specific transmission codes stored alongside it. The actual fault could be electrical, a sensor, a solenoid, or an internal transmission issue. You may notice harsh or delayed shifts, slipping, or the transmission going into a protective 'limp' mode. On Buick specifically, this code is documented across 1 model.
What causes P0700 on Buick vehicles?▼
Common causes on Buick: Stored companion transmission codes pointing to the real fault, Faulty shift solenoid or pressure control solenoid, Low, dirty, or degraded transmission fluid, Faulty transmission speed or input/output sensor, Wiring, connector, or ground problems at the transmission. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0700 on a Buick?▼
Repair costs vary widely depending on the root cause and specific Buick model.
Which Buick models have P0700 documented?▼
Au7o has documented P0700 on 1 Buick model: Encore GX.