How to reset the maintenance light on a Mercedes GLK300?

[VanReed]

Steps to reset the maintenance light on a Mercedes GLK300: 1. Power on the car, press the OK button on the left side of the steering wheel and the answer call button on the right side of the steering wheel; 2. Select AssystPlusWorkShop and press the OK button; 3. Choose the ServiceDone option and press the OK button to complete. The GLK is a mid-size SUV under the Mercedes-Benz brand, equipped with three types of engines: a low-power version of the 2.0L turbocharged engine, a high-power version of the 2.0L turbocharged engine, and a 3.0L naturally aspirated engine.

[DelCharles]

Last time when my GLK300's maintenance light came on, I reset it myself and it was super easy. First, completely turn off the car and sit in the driver's seat. Hold down the hooked OK button on the steering wheel with your left hand, then turn the key to the dashboard power-on position with your right hand—but don’t start the engine. At this point, a yellow wrench icon will pop up on the screen. Immediately release your left hand and quickly press the OK button again to confirm the reset. That’s it. Don’t step on the brake or start the car during the process, and make sure the actions are smooth. It took me three tries to succeed on my 2014 model—newer touchscreen models might have slightly different steps. If it doesn’t work, it’s best to check the owner’s manual to avoid wasting money at the dealership. Also, remember to check the oil dipstick and tire pressure while you’re at it.

[ElizabethAnn]

My neighbor Uncle Zhang, who has run an auto repair shop for twenty years, taught me a very practical method for resetting the GLK300 maintenance light: First, turn off the engine and remove the key, wait for two minutes, then reinsert the key but do not start the engine. Hold down the OK button on the steering wheel with your left hand, turn the key to the ON position with your right hand, and wait for the dashboard self-check to complete. When the maintenance prompt pops up, immediately release the button and press the OK button again to confirm. The old man specifically reminded me to turn the key all the way, as moving too slowly will cause the system to time out and fail. After resetting, he suggested checking the brake pads and windshield washer fluid, as these consumables are often overlooked, especially before long trips, to avoid breakdowns on the road.

[OMorgan]

My friend just bought a used GLK300 and encountered this issue. I taught him a three-step solution: After turning off the engine, hold the OK button → turn the key to power on → release the OK button when the dashboard prompts and then press to confirm. The whole process takes only 20 seconds! Key point: This must be done when the engine is cold, as the ECU system may respond slower when hot. The button position varies slightly by model year—the OK button is on the right side of the steering wheel for the 2010 model, but moved to the left for the 2014 model—but the method is generally the same. After resetting, it's recommended to note the current mileage for easier estimation of the next maintenance cycle, as delayed maintenance on German cars can easily trigger fault codes.

[MaxLynn]

Last time I saw a detailed tutorial shared on the Mercedes-Benz forum: Resetting the GLK300 maintenance light requires entering the engineering mode. Ensure the vehicle is completely turned off, then press and hold the OK button on the steering wheel while turning the key to the second position to power on. Release the button when the English maintenance menu pops up on the dashboard, use the up and down buttons to select 'reset,' and then press the OK button. Some owners have reported that accidentally pressing other buttons on the steering wheel can cause the process to fail, so it's recommended to turn off the radio to minimize interference. After resetting, don’t forget to check the air filter and coolant, especially replacing it with antifreeze before winter in northern regions where it can freeze. The radiator on this car is fragile and repairs are particularly expensive.

[LeRachel]

When I was repairing my car, the mechanic mentioned that resetting the maintenance light requires matching ECU parameters. If you do it yourself, pay attention to five points: you must completely disconnect the power for five minutes before proceeding; the button layout on the steering wheel differs between old and new GLK models, so check carefully; hold the OK button for at least three seconds; turn the ignition switch to the position where all dashboard lights are on; after confirming the reset, wait ten seconds before turning off the power. Most reset failures are caused by turning the key too quickly, which interrupts the sensor signal. If it fails three times in a row, you’ll need to visit a 4S shop and use a diagnostic computer. By the way, it’s best to use genuine oil for this car’s maintenance, as aftermarket parts can easily trigger the fault light.