P0705 on GMC Terrain
Factory diagnostic protocol and troubleshooting wire for fault code P0705 specifically for the GMC Terrain (2020–2026, 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages).
1. Symptoms of P0705 on GMC Terrain
When the Engine Control Module (ECM/PCM) on your GMC Terrain (1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages) logs fault code P0705, drivers commonly observe:
2. Most Likely Causes on GMC Terrain
Historical warranty claims and technical repair bulletins for GMC Terrain point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for GMC Terrain
Move gear selector through all positions while monitoring scan tool TR PID to see which gear positions fail to register. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Ensure the mechanical shift linkage fully clicks the transmission lever into the physical detent for Park and Neutral. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Use multimeter to check continuity across switch pins in Park, Reverse, Neutral, and Drive. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Loosen mounting bolts, use alignment pin to align sensor slot with transmission shaft in Neutral, torque bolts, or install new OEM sensor. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Clear DTCs and confirm engine starts in Park and Neutral, reverse lights activate, and gear display is accurate. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Equipment for Diagnosing GMC Terrain (P0705)
GMC Terrain OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for GMC Terrain.
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.
Other Common Fault Codes on GMC Terrain
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the GMC Terrain:
4. GMC Terrain P0705 FAQs
What causes code P0705 to trigger on a GMC Terrain?
On the GMC Terrain (1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages), P0705 is most frequently caused by Misaligned or faulty Transmission Range Sensor / Neutral Safety Switch (NSS) or Corroded or water-logged connector on transmission side.
Where is the OBD-II port located on my GMC Terrain?
On the GMC Terrain, the 16-pin DLC diagnostic connector is located Driver footwell directly above brake pedal. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my GMC Terrain with code P0705?
Caution. Vehicle may not start in Park, backup lights may not work, and transmission may lock in Limp Mode. Given that P0705 carries a High severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.