P2729 on Mercedes-Benz: How to Diagnose & Fix
Pressure Control Solenoid 'E' Control Circuit Low
1 Mercedes-Benz model · 1 documented issue · 1 critical · $250-$3,200 repair
P2729 on Mercedes-Benz by model: symptoms, diagnosis and fix
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)
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 on a 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 it is documented across 1 model: GLA.
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 on a Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $250 to $3,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2729 on a different make?
View P2729 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.