P2729 on Mercedes-Benz
Pressure Control Solenoid 'E' Control Circuit Low
P2729 on Mercedes-Benz vehicles indicates pressure control solenoid 'e' control circuit low. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on GLA. P2729 is a generic powertrain code indicating the transmission control module (TCM/PCM) has detected an abnormally low voltage (or low signal) in the control circuit for pressure control solenoid 'E'. This solenoid regulates hydraulic line pressure inside the automatic transmission, so a fault can cause improper shift pressure, slipping, or harsh/erratic shifting. Typical repair costs on Mercedes-Benz range from $250 to $3,200, depending on the specific model and root cause.
Common Causes of P2729
- •Failed or shorted pressure control solenoid 'E'
- •Low or contaminated/degraded transmission fluid
- •Damaged, shorted, corroded, or chafed wiring/connector in the solenoid circuit
- •Internal transmission hydraulic blockage or worn valve body
- •Faulty TCM/PCM or internal driver failure
- •Poor electrical ground or open in the solenoid harness
P2729 on Mercedes-Benz by Model
Mercedes-Benz GLA(1 issue)
- 7G-DCT (724.0) Dual-Clutch Transmission Shudder & Mechatronics Failure2015-2020
The X156 GLA's 7G-DCT 7-speed wet dual-clutch transmission (type 724.0) is prone to low-speed shudder/judder, jerky or delayed engagement, and clutch slip, typically emerging from ~40,000-75,000 mi (60,000-120,000 km). Root causes are wet multi-plate clutch wear, degraded/contaminated DCT fluid, and failure of the mechatronics control unit that manages clutch pressures. Stop-go urban driving and skipped fluid services accelerate it. Once shuddering begins, worn clutch packs can progress to a no-drive condition within a few thousand km.
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View P2729 across all makes →Frequently Asked Questions
What does P2729 mean on Mercedes-Benz?▼
P2729 stands for "Pressure Control Solenoid 'E' Control Circuit Low." P2729 is a generic powertrain code indicating the transmission control module (TCM/PCM) has detected an abnormally low voltage (or low signal) in the control circuit for pressure control solenoid 'E'. This solenoid regulates hydraulic line pressure inside the automatic transmission, so a fault can cause improper shift pressure, slipping, or harsh/erratic shifting. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P2729 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Failed or shorted pressure control solenoid 'E', Low or contaminated/degraded transmission fluid, Damaged, shorted, corroded, or chafed wiring/connector in the solenoid circuit, Internal transmission hydraulic blockage or worn valve body, Faulty TCM/PCM or internal driver failure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2729 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $250 to $3,200, depending on the specific model and root cause.
Which Mercedes-Benz models have P2729 documented?▼
Au7o has documented P2729 on 1 Mercedes-Benz model: GLA.