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
Most Reported On
P2729 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2015-2020 Mercedes-Benz GLA (GLA 180, GLA 200, GLA 250, GLA 220 (petrol)), with repair costs ranging from $250 to $3,200.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P2729, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
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.