P0793 on Mercedes-Benz
Intermediate Shaft Speed Sensor "A" Circuit No Signal
P0793 on Mercedes-Benz vehicles indicates intermediate shaft speed sensor "a" circuit no signal. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on SLK-Class. This code sets when the transmission control module receives no signal from the intermediate shaft speed sensor (sensor A). This sensor measures the rotational speed of an intermediate shaft inside the automatic transmission/transaxle, and the module uses it to calculate gear ratios and command proper shifts. Without this signal the transmission may shift harshly, shift erratically, or enter failsafe mode. The fault is usually in the sensor, its wiring, or the related circuit. Typical repair costs on Mercedes-Benz range from $900 to $2,000, depending on the specific model and root cause.
Common Causes of P0793
- •Failed intermediate shaft speed sensor
- •Damaged, corroded, or loose wiring/connector
- •Open or short in the sensor circuit
- •Metal debris on the sensor tip
- •Low or dirty transmission fluid affecting sensor reading
- •Internal transmission wiring fault
- •Faulty transmission control module (less common)
P0793 on Mercedes-Benz by Model
Mercedes-Benz SLK-Class(1 issue)
- 7G-Tronic Conductor Plate / Speed Sensor Failure2005-2011
The 722.9 7G-Tronic automatic transmission used in later R171 models is known for conductor plate and internal speed sensor failures. When the plate or sensors fail, the transmission may enter limp mode, shift harshly, or get stuck in one gear due to loss of accurate input/output speed data.
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What does P0793 mean on Mercedes-Benz?▼
P0793 stands for "Intermediate Shaft Speed Sensor "A" Circuit No Signal." This code sets when the transmission control module receives no signal from the intermediate shaft speed sensor (sensor A). This sensor measures the rotational speed of an intermediate shaft inside the automatic transmission/transaxle, and the module uses it to calculate gear ratios and command proper shifts. Without this signal the transmission may shift harshly, shift erratically, or enter failsafe mode. The fault is usually in the sensor, its wiring, or the related circuit. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0793 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Failed intermediate shaft speed sensor, Damaged, corroded, or loose wiring/connector, Open or short in the sensor circuit, Metal debris on the sensor tip, Low or dirty transmission fluid affecting sensor reading. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0793 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $900 to $2,000, depending on the specific model and root cause.
Which Mercedes-Benz models have P0793 documented?▼
Au7o has documented P0793 on 1 Mercedes-Benz model: SLK-Class.