P2729 on 2015-2020 Mercedes-Benz GLA (GLA 180, GLA 200, GLA 250, GLA 220 (petrol)) — Pressure Control Solenoid 'E' Control Circuit Low
1 vehicles · 1 makes · $250-$3,200 repair
How to diagnose and fix P2729: most-reported vehicles
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Mercedes-Benz GLA · 2015–2020
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.
Common Symptoms
- Low-speed shudder or vibration when pulling away
- Jerking or harsh engagement
- Delayed shifts
- Clutch slip / flaring revs
- Eventual loss of drive
How to Fix
First step is a DCT fluid (DCTF) and filter change with a STAR/XENTRY clutch adaptation reset; this often clears early shudder. Persistent slip/jerk requires clutch pack replacement, and an internal-failure mechatronics unit must be replaced and re-coded. Mercedes addressed some early cars via TCU software updates. Use only the specified DCTF and adhere to the ~40k mi adaptation/60k km fluid intervals.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- BLAU/Ravenol 724.0 DCT fluid and dual-filter service kit F2A1503-BOEMBlauparts F2A1503-B
Scheduled fluid/filter service branch for confirmed 2015-2018 GLA250 724.0 transmissions, not a shudder diagnosis Fitment/availability: The inspected direct U.S.
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Sources for this issue (2)
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P2729 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2729 mean?
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.
What are the most common causes of P2729?
The most common causes of P2729 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P2729?
Repair costs for P2729 range from $250 to $3,200, depending on the vehicle and root cause.
Which vehicles are affected by P2729?
Au7o has documented P2729 across 1 vehicle models from 1 manufacturers: Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.