P0700 on Mercedes-Benz
Transmission Control System Malfunction
P0700 on Mercedes-Benz vehicles indicates transmission control system malfunction. Au7o has documented this code across 5 Mercedes-Benz models — most commonly on CLS-Class, GLE, GLS. P0700 is a general code indicating the transmission control module (TCM) has detected a fault somewhere in the transmission control system and has requested the check engine light be turned on. By itself it doesn't pinpoint the problem — it's an 'umbrella' code that tells you to look for additional, more specific transmission codes stored alongside it. The actual fault could be electrical, a sensor, a solenoid, or an internal transmission issue. You may notice harsh or delayed shifts, slipping, or the transmission going into a protective 'limp' mode. Typical repair costs on Mercedes-Benz range from $150 to $4,000, depending on the specific model and root cause.
Common Causes of P0700
- •Stored companion transmission codes pointing to the real fault
- •Faulty shift solenoid or pressure control solenoid
- •Low, dirty, or degraded transmission fluid
- •Faulty transmission speed or input/output sensor
- •Wiring, connector, or ground problems at the transmission
- •Failing transmission control module (TCM)
- •Internal transmission mechanical wear or clutch problems
- •Valve body fault or sticking valves
P0700 on Mercedes-Benz by Model
Mercedes-Benz CLS-Class(1 issue)
- 7G-Tronic Transmission Valve Body Failure2005-2014
The 722.9 7G-Tronic automatic transmission in CLS models suffers from valve body conductor plate failures. The electronic conductor plate controls shift solenoids and develops internal short circuits or loses communication, causing harsh shifting, getting stuck in limp mode, or refusing to shift out of park. This is one of the most common transmission failures on Mercedes vehicles of this era.
Mercedes-Benz GLE(1 issue)
- 9G-Tronic (725.0) Harsh Shifting and Delayed Engagement from Valve Body Wear2020-2024
GLE 350 and GLE 450 models (2020+, 9G-Tronic 9-speed automatic) develop harsh low-gear shifts, clunking, and delayed engagement when selecting Drive or Reverse as the transmission ages. The most common root cause is degradation of the valve-body solenoids and conductor plate, aggravated by Mercedes marketing the ATF as 'lifetime' fill when real-world driving needs service far sooner. Contaminated or degraded fluid accelerates solenoid wear, producing erratic shift quality and occasional limp mode.
Mercedes-Benz GLS(2 issues)
- 9G-Tronic Harsh Shift2017-2023
The 9G-Tronic nine-speed automatic exhibits harsh low-speed shifts and hunting between gears on inclines. The transmission software struggles to select the optimal gear among nine ratios, particularly noticeable in stop-and-go traffic.
- Engine Stall from Transmission Control Unit Software (Recall 24V118)2020-2023
Recall 24V118 covers model-year 2020-2023 GLS 450 vehicles equipped with the six-cylinder gasoline engine and nine-speed transmission. If a 7th-to-6th downshift is not completed during slight braking while other conditions coincide, including low transmission-oil temperature and 48V recuperation, the engine can stall and propulsion can be lost. Steering and braking remain functional, and the engine can be restarted after the vehicle stops. The 105,071 total is the combined GLE 450 and GLS 450 recall population, not owner reports.
Mercedes-Benz Metris(1 issue)
- Harsh Shifting and Delayed Engagement in 7G-Tronic Transmission2016-2023
The 7G-Tronic automatic transmission in the Metris exhibits harsh shifts, particularly the 2-3 and 4-5 upshifts, along with delayed engagement when shifting from park to drive. The issue worsens as the transmission fluid ages and the valve body accumulates debris from clutch material.
Mercedes-Benz Sprinter(1 issue)
- 722.6 (NAG1) Automatic Transmission Conductor Plate Failure / Limp Mode2007-2018
Sprinters with the 5-speed 722.6 (NAG1) automatic use an internal conductor plate that carries the shift-solenoid wiring and the input/output speed sensors. The conductor plate is a known weak point: when it fails the transmission control unit gets bad speed signals, lights the warning lamp and drops the van into limp-home mode, typically stuck in a single gear (often 2nd). Symptoms include harsh or delayed shifts and an inability to shift out of second.
Looking for P0700 on a different make?
View P0700 across all makes →Frequently Asked Questions
What does P0700 mean on Mercedes-Benz?▼
P0700 stands for "Transmission Control System Malfunction." P0700 is a general code indicating the transmission control module (TCM) has detected a fault somewhere in the transmission control system and has requested the check engine light be turned on. By itself it doesn't pinpoint the problem — it's an 'umbrella' code that tells you to look for additional, more specific transmission codes stored alongside it. The actual fault could be electrical, a sensor, a solenoid, or an internal transmission issue. You may notice harsh or delayed shifts, slipping, or the transmission going into a protective 'limp' mode. On Mercedes-Benz specifically, this code is documented across 5 models.
What causes P0700 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Stored companion transmission codes pointing to the real fault, Faulty shift solenoid or pressure control solenoid, Low, dirty, or degraded transmission fluid, Faulty transmission speed or input/output sensor, Wiring, connector, or ground problems at the transmission. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0700 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $150 to $4,000, depending on the specific model and root cause.
Which Mercedes-Benz models have P0700 documented?▼
Au7o has documented P0700 on 5 Mercedes-Benz models: CLS-Class, GLE, GLS, Metris, Sprinter.