The transmission keeps slipping on my 2002 Mercedes-Benz C-Class. Do you know what could fix this?

Question

Accepted Answer

If the transmission is working properly between bouts of slippage, then it’s reasonable to think that this could be an electronic problem rather than a mechanical one. By turning the ignition off and then restarting, you’re effectively resetting the computer that controls the transmission. That’s why the gearbox comes good for a period before reverting to its old tricks.
That’s on the surface, anyway, but the problem could also be within the torque converter or something intermittent inside the actual gearsets, clutches, bands or valve body that is giving the same set of symptoms.
Ultimately, this is probably going to require a trip to a transmission specialist who will be able to identify the cause more accurately. In the meantime, though, there’s something you can try that might reset the transmission more permanently. On this model Mercedes-Benz, there’s a specific transmission-reset procedure that should take the gearbox back to its original factory settings. If that’s the case, it might fix your problem, but if not, then you need to call in the experts.
The procedure starts with getting in the car, closing all the doors and turning the ignition key to the on position, but not actually starting the engine. You should have all the dashboard lights illuminated at this point. Then, press the accelerator pedal right to the floor, making sure you can feel that the kick-down détente has been activated. Hold the pedal all the way down for at least 60 seconds and then, without releasing the accelerator, turn off the ignition. Don’t open the door and don’t remove the key from the ignition. Now release the accelerator and wait five minutes before starting the engine and going for a test drive.
Good luck.

Mercedes-Benz C-Class Model	Body Type	Specs	Price from	Price to
C300 Base	Body Type: Convertible	Specs: 2.0L ULP 9 SP AUTO	Price From: $59,950	Price To: $152,020
C63 S	Body Type: Convertible	Specs: 4.0L PULP 9 SP AUTO	Price From: $125,400	Price To: $209,000
C300 AMG Line Plus Edition	Body Type: Convertible	Specs: 2.0L ULP 9 SP AUTO	Price From: $67,870	Price To: $126,610
C63 S Final Edition	Body Type: Convertible	Specs: 4.0L PULP 9 SP AUTO	Price From: $186,780	Price To: $235,070
C300 Base	Body Type: Wagon	Specs: 2.0L ULP 9 SP AUTO	Price From: $59,950	Price To: $152,020
C63 S	Body Type: Wagon	Specs: 4.0L PULP 9 SP AUTO	Price From: $125,400	Price To: $209,000
C300 Base	Body Type: Coupe	Specs: 2.0L ULP 9 SP AUTO	Price From: $59,950	Price To: $152,020
C63 S	Body Type: Coupe	Specs: 4.0L PULP 9 SP AUTO	Price From: $125,400	Price To: $209,000
C300 AMG Line Plus Edition	Body Type: Coupe	Specs: 2.0L ULP 9 SP AUTO	Price From: $67,870	Price To: $126,610
C63 S Final Edition	Body Type: Coupe	Specs: 4.0L PULP 9 SP AUTO	Price From: $186,780	Price To: $235,070
C300 Base	Body Type: Sedan	Specs: 2.0L ULP 9 SP AUTO	Price From: $59,950	Price To: $152,020
C300 Edition C	Body Type: Sedan	Specs: 2.0L ULP 9 SP AUTO	Price From: $71,940	Price To: $88,990
C300 E (hybrid)	Body Type: Sedan	Specs: 2.0L Hybrid 9 SP AUTO	Price From: $76,780	Price To: $88,220
C200 Edition C Mhev	Body Type: Sedan	Specs: 1.5L Hybrid 9 SP AUTO	Price From: $57,860	Price To: $66,550

Mercedes-Benz C-Class Model	Body Type	Height x Width x Length	Ground Clearance
C43 Base	Body Type: Convertible	Height x Width x Length: 1413x1810x4708 mm	Ground Clearance: 106 mm
C300 AMG Line Plus Edition	Body Type: Convertible	Height x Width x Length: 1406x1810x4691 mm	Ground Clearance: 118 mm
C63 S	Body Type: Convertible	Height x Width x Length: 1411x1877x4751 mm	Ground Clearance: 117 mm
C63 S Final Edition	Body Type: Convertible	Height x Width x Length: 1411x1877x4751 mm	Ground Clearance: 117 mm
C43 Base	Body Type: Wagon	Height x Width x Length: 1467x1810x4707 mm	Ground Clearance: 112 mm
C63 S	Body Type: Wagon	Height x Width x Length: 1440x1839x4772 mm	Ground Clearance: 116 mm
C43 Base	Body Type: Coupe	Height x Width x Length: 1410x1810x4708 mm	Ground Clearance: 116 mm
C300 AMG Line Plus Edition	Body Type: Coupe	Height x Width x Length: 1396x1810x4691 mm	Ground Clearance: 117 mm
C63 S	Body Type: Coupe	Height x Width x Length: 1402x1877x4750 mm	Ground Clearance: 117 mm
C63 S Final Edition	Body Type: Coupe	Height x Width x Length: 1402x1877x4750 mm	Ground Clearance: 117 mm
C200 Edition C Mhev	Body Type: Sedan	Height x Width x Length: 1437x1820x4751 mm	Ground Clearance: 150 mm
C300 Mhev	Body Type: Sedan	Height x Width x Length: 1437x1820x4751 mm	Ground Clearance: 150 mm
C43 Base	Body Type: Sedan	Height x Width x Length: 1434x1810x4714 mm	Ground Clearance: 116 mm
C300 E (hybrid)	Body Type: Sedan	Height x Width x Length: 1452x1810x4707 mm	Ground Clearance: 135 mm

Mercedes-Benz C-Class Model	Body Type	Front Tyre Size	Front Rim	Rear Rim
C63 S	Body Type: Convertible	Front Tyre Size: 255x35 ZR19	Front Rim: 9.0x19 in	Rear Rim: 10.5x20 in
C63 S Final Edition	Body Type: Convertible	Front Tyre Size: 255x35 ZR19	Front Rim: 9.0x19 in	Rear Rim: 10.5x20 in
C300 Base	Body Type: Convertible	Front Tyre Size: 225x45 R19	Front Rim: 7.5x19 in	Rear Rim: 8.5x19 in
C300 AMG Line Plus Edition	Body Type: Convertible	Front Tyre Size: 225x40 R19	Front Rim: 7.5x19 ET 44 in	Rear Rim: 8.5x19 ET 52 in
C63 S	Body Type: Wagon	Front Tyre Size: 255x35 ZR19	Front Rim: 9.0x19 in	Rear Rim: 10.5x20 in
C300 Base	Body Type: Wagon	Front Tyre Size: 225x45 R19	Front Rim: —	Rear Rim: —
C63 S	Body Type: Coupe	Front Tyre Size: 255x35 ZR19	Front Rim: 9.0x19 in	Rear Rim: 10.5x20 in
C63 S Final Edition	Body Type: Coupe	Front Tyre Size: 255x35 ZR19	Front Rim: 9.0x19 in	Rear Rim: 10.5x20 in
C300 Base	Body Type: Coupe	Front Tyre Size: 225x45 R19	Front Rim: 7.5x19 in	Rear Rim: 8.5x19 in
C300 AMG Line Plus Edition	Body Type: Coupe	Front Tyre Size: 225x45 R19	Front Rim: 7.5x19 ET 44 in	Rear Rim: 8.5x19 ET 52 in
C300 Base	Body Type: Sedan	Front Tyre Size: 225x45 R19	Front Rim: —	Rear Rim: —
C43 4Matic Mhev	Body Type: Sedan	Front Tyre Size: 245x35 R20	Front Rim: 8.0x20 in	Rear Rim: 9.5x20 in
C300 E (hybrid)	Body Type: Sedan	Front Tyre Size: 225x45 R18	Front Rim: —	Rear Rim: —
C300 Edition C	Body Type: Sedan	Front Tyre Size: 225x40 R19	Front Rim: —	Rear Rim: —

Mercedes-Benz C-Class Model	Body Type	Specs	Fuel Consumption
C43 Base	Body Type: Convertible	Specs: 3.0L PULP 9 SP AUTO	Fuel Consumption: 10.0L/100km
C63 S	Body Type: Convertible	Specs: 4.0L PULP 9 SP AUTO	Fuel Consumption: 10.7L/100km
C200 Base	Body Type: Convertible	Specs: 2.0L ULP 9 SP AUTO	Fuel Consumption: 7.6L/100km
C43 Base	Body Type: Wagon	Specs: 3.0L PULP 9 SP AUTO	Fuel Consumption: 9.6L/100km
C63 S	Body Type: Wagon	Specs: 4.0L PULP 9 SP AUTO	Fuel Consumption: 10.7L/100km
C200 Base	Body Type: Wagon	Specs: 2.0L ULP 9 SP AUTO	Fuel Consumption: 7.4L/100km
C300 Base	Body Type: Wagon	Specs: 2.0L ULP 9 SP AUTO	Fuel Consumption: 7.2L/100km
C43 Base	Body Type: Coupe	Specs: 3.0L PULP 9 SP AUTO	Fuel Consumption: 9.5L/100km
C63 S	Body Type: Coupe	Specs: 4.0L PULP 9 SP AUTO	Fuel Consumption: 10.3L/100km
C200 Base	Body Type: Coupe	Specs: 2.0L ULP 9 SP AUTO	Fuel Consumption: 7.0L/100km
C43 Base	Body Type: Sedan	Specs: 3.0L PULP 9 SP AUTO	Fuel Consumption: 9.4L/100km
C200 Base	Body Type: Sedan	Specs: 2.0L ULP 9 SP AUTO	Fuel Consumption: 7.0L/100km
C300 E (hybrid)	Body Type: Sedan	Specs: 2.0L Hybrid 9 SP AUTO	Fuel Consumption: 2.1L/100km
C200 Edition C Mhev	Body Type: Sedan	Specs: 1.5L Hybrid 9 SP AUTO	Fuel Consumption: 6.9L/100km
C300 Mhev	Body Type: Sedan	Specs: 2.0L Hybrid 9 SP AUTO	Fuel Consumption: 7.3L/100km
C43 4Matic Mhev	Body Type: Sedan	Specs: 2.0L PULP 9 SP AUTO	Fuel Consumption: 9.1L/100km

Mercedes-Benz C-Class Model	Body Type	Specs	Braked Capacity
C63 S	Body Type: Convertible	Specs: 4.0L PULP 9 SP AUTO	Braked Capacity: 0kg
C63 S Final Edition	Body Type: Convertible	Specs: 4.0L PULP 9 SP AUTO	Braked Capacity: 0kg
C300 Base	Body Type: Convertible	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C300 AMG Line Plus Edition	Body Type: Convertible	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C63 S	Body Type: Wagon	Specs: 4.0L PULP 9 SP AUTO	Braked Capacity: 1800kg
C300 Base	Body Type: Wagon	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C63 S	Body Type: Coupe	Specs: 4.0L PULP 9 SP AUTO	Braked Capacity: 0kg
C63 S Final Edition	Body Type: Coupe	Specs: 4.0L PULP 9 SP AUTO	Braked Capacity: 0kg
C300 Base	Body Type: Coupe	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C300 AMG Line Plus Edition	Body Type: Coupe	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C300 Base	Body Type: Sedan	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg
C43 4Matic Mhev	Body Type: Sedan	Specs: 2.0L PULP 9 SP AUTO	Braked Capacity: 1800kg
C300 E (hybrid)	Body Type: Sedan	Specs: 2.0L Hybrid 9 SP AUTO	Braked Capacity: 0kg
C300 Edition C	Body Type: Sedan	Specs: 2.0L ULP 9 SP AUTO	Braked Capacity: 1800kg

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