P0793 on 2005-2011 Mercedes-Benz SLK-Class — Intermediate Shaft Speed Sensor "A" Circuit No Signal
1 vehicles · 1 makes · $900-$2,000 repair
How to diagnose and fix P0793: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Mercedes-Benz SLK-Class · 2005–2011
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.
Common Symptoms
- Transmission stuck in limp mode
- Harsh or delayed shifting
- Vehicle starts in second gear
- Transmission warning message
- Check engine light or transmission fault codes
How to Fix
Diagnosis involves scanning the transmission control module for speed sensor and gear ratio faults, then confirming fluid condition and connector integrity. Repair usually includes replacing the conductor plate, transmission connector sleeve, fluid, and filter, followed by adaptation reset and relearn. Typical repair cost is about $900-$2,000 at an independent Mercedes specialist.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mercedes 722.9 conductor-plate service kit 000270260080OEMMercedes-Benz A000270260080 / kit 000270260080KT
Matched 722.9 VGS/conductor-plate repair after EHS generation and internal speed-sensor failure are confirmed Fitment/availability: The inspected direct U.S.
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Owner tips & cautions
- TipUse the correct Mercedes-spec transmission fluid and perform adaptation reset after repair.
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P0793 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0793 mean?
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.
What are the most common causes of P0793?
The most common causes of P0793 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0793?
Repair costs for P0793 range from $900 to $2,000, depending on the vehicle and root cause.
Which vehicles are affected by P0793?
Au7o has documented P0793 across 1 vehicle models from 1 manufacturers: Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.