P0355 on GMC Terrain
Factory diagnostic protocol and troubleshooting wire for fault code P0355 specifically for the GMC Terrain (2020–2026, 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages).
1. Symptoms of P0355 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 P0355, 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
Connect an OBD-II scan tool and record freeze frame sensor telemetry for code P0355 to note engine RPM, load, and voltage when the fault triggered. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Inspect the electrical connector and wiring harness related to P0355 for chafing, corrosion, moisture, or pin push-out. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Measure circuit voltage supply (12V B+ or 5V reference) and sensor/actuator resistance according to factory repair manual specifications. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Install a new OEM-grade replacement part, torque fasteners to factory spec, and ensure electrical locking tabs click firmly. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Clear all stored DTCs from vehicle memory and perform an OBD-II drive cycle to confirm the diagnostic monitor resets to 'Ready'. on the GMC Terrain equipped with 1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages.
Equipment for Diagnosing GMC Terrain (P0355)
Direct-Fit Laser Iridium Spark Plugs (Set of 4/6)
Pre-gapped iridium spark plugs engineered to restore smooth combustion on GMC Terrain.
Magnetic Swivel Spark Plug Socket Set
360-degree magnetic swivel socket prevents ceramic plug cracks inside deep engine spark wells.
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 P0355 FAQs
What causes code P0355 to trigger on a GMC Terrain?
On the GMC Terrain (1.5L Turbo 4-Cyl (175HP) / Denali & AT4 Trim Packages), P0355 is most frequently caused by Dead Cylinder 5 ignition coil or Wiring damage.
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 P0355?
No. Cylinder 5 ignition coil dead. Given that P0355 carries a Critical severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.