MG ZS (Gen2) P0705 Transmission Range Sensor Circuit Fault

The P0705 Transmission Range Sensor Circuit Fault indicates that the Transmission Control Module (TCM) or Engine Control Module (ECM) has detected an invalid or implausible signal from the transmission range sensor, also known as the gear position or park/neutral position sensor. This sensor informs the control modules of the selected gear (Park, Reverse, Neutral, Drive, etc.) and is essential for proper gear selection, starting, and shift control. If the signal is missing, inconsistent, or outside the expected range, the control module stores DTC P0705. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

Symptoms

  • Check Engine Light illuminated
  • Transmission warning light or message displayed
  • Vehicle fails to start in Park or Neutral
  • Incorrect gear indication on the instrument cluster
  • Harsh or delayed gear changes
  • Transmission enters limp-home mode
  • Reduced vehicle performance
  • Additional transmission-related DTCs may be present

Possible Causes

  • Faulty transmission range sensor
  • Misadjusted transmission range sensor
  • Damaged gear selector linkage
  • Open or short circuit in the transmission range sensor wiring
  • Corroded or loose electrical connectors
  • Internal transmission selector mechanism fault
  • CAN Bus communication fault
  • Faulty Transmission Control Module (TCM)
  • Low system voltage
  • Engine Control Module (ECM) fault (rare)

Diagnosis

Diagnosis begins by confirming the stored fault code and reviewing freeze-frame and transmission live data using a compatible diagnostic scan tool. The indicated gear position should be compared with the actual selector position to identify signal discrepancies. The transmission range sensor and gear selector linkage should be inspected for correct adjustment, damage, or excessive wear. Wiring, connectors, power supply, and ground circuits should be tested for continuity and voltage drop, while live data should be monitored during gear selection to verify accurate sensor operation. Manufacturer diagnostic procedures may also include testing the transmission range sensor output, inspecting the selector mechanism, and checking communication between the ECM and TCM.

For vehicles operating in New Zealand, following OEM diagnostic procedures helps accurately distinguish between a faulty transmission range sensor, wiring fault, selector linkage issue, or transmission control module problem before replacing expensive components.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, connector pinouts, transmission range sensor specifications, selector adjustment procedures, CAN Bus communication diagnostics, TCM testing procedures, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2024, 2025, 2026, onwards

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