P0705 on Mercedes-Benz: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0705 specifically affecting Mercedes-Benz vehicles (C-Class, E-Class, S-Class, GLC, GLE).
Select Your Mercedes-Benz Model for P0705:
1. Common Symptoms on Mercedes-Benz Vehicles
When Mercedes-Benz Engine Control Modules (ECM) trigger fault code P0705, drivers typically report:
2. Root Causes on Mercedes-Benz Engines
Historical diagnostic claims across Mercedes-Benz engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Mercedes-Benz
Move gear selector through all positions while monitoring scan tool TR PID to see which gear positions fail to register. on Mercedes-Benz engines.
Ensure the mechanical shift linkage fully clicks the transmission lever into the physical detent for Park and Neutral. on Mercedes-Benz engines.
Use multimeter to check continuity across switch pins in Park, Reverse, Neutral, and Drive. on Mercedes-Benz engines.
Loosen mounting bolts, use alignment pin to align sensor slot with transmission shaft in Neutral, torque bolts, or install new OEM sensor. on Mercedes-Benz engines.
Clear DTCs and confirm engine starts in Park and Neutral, reverse lights activate, and gear display is accurate. on Mercedes-Benz engines.
Equipment for Diagnosing Mercedes-Benz (P0705)
Mercedes-Benz OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Mercedes-Benz.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. Mercedes-Benz P0705 Frequently Asked Questions
What does code P0705 mean on a Mercedes-Benz?
On Mercedes-Benz vehicles, P0705 indicates that the Engine Control Module (ECM) detected transmission range sensor circuit malfunction (prndl input). This typically points to Misaligned or faulty Transmission Range Sensor / Neutral Safety Switch (NSS) or Corroded or water-logged connector on transmission side.
Can I continue driving my Mercedes-Benz with code P0705?
Caution. Vehicle may not start in Park, backup lights may not work, and transmission may lock in Limp Mode. Because this code carries a High severity rating on Mercedes-Benz powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0705 on a Mercedes-Benz?
Estimated DIY parts cost ranges from $120 - $450 (DIY: $40 - $160), while professional shop repairs at an authorized Mercedes-Benz dealership or independent specialist typically range from $180 to $380 including diagnostic labor.