![]() ![]() Type of light: On the GMC Terrain, the tail light is a dedicated lamp with just one function.Manufacturers make slight changes from year to year, so the casing or lamp size could vary. You also need to be aware of the model year of your GMC. For some cars, the tail and brake lights are the same, just the color intensity changes when braking. How do you find the right replacement parts for GMCs?įirst, you need to know what kind of lighting setup your vehicle has. On some cars, the tail lights and brake lights are all one unit, and the color intensity changes with function. These light up when you step on the brake. Tail lights: Red in color, these are always on when your headlights are on.If your tail lights are defective, you can incur warnings and even tickets. These lamps help prevent collisions, from minor fender benders to more serious actions at high speed. When your headlights are on, your red tail lights will come on automatically. Tail lights are just one part of the lighting assembly for your GMC Terrain. How do tail lights function on a Terrain? Replacing tail lights when they go out is key to avoiding tickets and maintaining the safest ride possible. ![]() These red lights make it easier for other vehicles to see you on the road, both during the day and at night. Subscribe to GM Authority for more GMC Terrain news, GMC news, and around-the-clock GM news coverage.Tail lights are an important safety feature for your GMC Terrain. More information can be found in reference to Bulletin #22-NA-170. If water intrusion is found, add dielectric grease to the connector and continue the diagnosis as required. If water damage is discovered, also check the BCM connector for signs of water intrusion. Be sure to disable the SIR system prior to inspection. In the event that water intrusion or corrosion is discovered, replace the connector with terminated leads on the body harness side, and /or replace the fuel pump module harness.Ĭheck connector X320 (Right Front Seat Harness to Body Harness connector) if DTC B0073 is triggered or the Service Safety Restraints message is seen on the DIC. In the event that DTC P12A6 is triggered, connector X350 (Fuel Tank Harness to Body Harness) should be checked, as water corrosion may short the terminals together, resulting in the fuel pump to run after the ignition is turned off, thus draining the battery and leading to a no start or extended crank condition. The taillight and bulb connector should be replaced if corroded. If these conditions are encountered, it’s recommended that the GMC Terrain taillight bulb connectors are inspected for possible water corrosion. Units of the GMC Terrain from the 2018 through 2023 model years may be affected. Water may travel through the bulb connector wire strands to the X350 connector, X320 connector, or Body Control Module (BCM). Additionally, the issue may trigger Diagnostic Trouble Code (DTC) P12A6 (Fuel Pump Driver Control Module Enable Circuit Performance) or DTC B0073 (Passenger Seat Belt Switch Circuit).Īccording to the report, these conditions may occur as a result of water intrusion in the GMC Terrain right-side taillight due to a broken lens or housing. Per a report from GM TechLink, some of these issues include a no start or extended crank condition, a dead battery, a fuel pump that runs when the ignition is off, and a Service Safety Restraints message on the Driver Information Center. ![]() Some units of the GMC Terrain may experience a range of electrical issues as a result of water intrusion in the taillights. ![]()
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