P0722: Output Speed Sensor Circuit No Signal
4 vehicles · 3 makes · $150-$3,500 repair
Most Reported On
P0722 is an OBD-II diagnostic trouble code meaning “Output Speed Sensor Circuit No Signal.” This code means the transmission control module is receiving no signal at all from the output speed sensor, which measures how fast the transmission's output shaft (and therefore the vehicle) is turning. The computer relies on this sensor to time gear shifts, control the torque converter, and confirm road speed, so when the signal drops out it suspects a broken circuit or dead sensor. You may notice harsh or erratic shifting, the transmission staying in one gear, or an inaccurate or dead speedometer. It is an electrical/no-signal fault rather than just an out-of-range reading. This code is most commonly reported on 2003-2012 Mercedes-Benz E-Class (E320, E350, E500, E550), 2005-2013 Mercedes-Benz C-Class (C230, C280, C300, C350), and 2008-2019 GMC Sierra 3500HD, plus 1 other vehicle, with repair costs ranging from $150 to $3,500.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0722, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (4)
FAQ
What does P0722 mean?
P0722 stands for "Output Speed Sensor Circuit No Signal." This code means the transmission control module is receiving no signal at all from the output speed sensor, which measures how fast the transmission's output shaft (and therefore the vehicle) is turning. The computer relies on this sensor to time gear shifts, control the torque converter, and confirm road speed, so when the signal drops out it suspects a broken circuit or dead sensor. You may notice harsh or erratic shifting, the transmission staying in one gear, or an inaccurate or dead speedometer. It is an electrical/no-signal fault rather than just an out-of-range reading.
What are the most common causes of P0722?
The most common causes of P0722 are: Failed output (vehicle) speed sensor, Broken, corroded, or loose sensor wiring or connector, Open or shorted circuit between sensor and TCM, Damaged sensor reluctor/tone ring on the output shaft, Metal debris or contamination on the sensor tip, Poor ground or power supply to the sensor, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0722?
Repair costs for P0722 range from $150 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P0722?
Au7o has documented P0722 across 4 vehicle models from 3 manufacturers: GMC, Hyundai, Mercedes-Benz.
Sources (8)
- manufacturerECU Testing: Mercedes 7G-Tronic TCM conductor plate failure
- mediaMB Medic: 722.9 7G-Tronic Valve Body & Conductor Plate Must Read
- manufacturerUpFix: 722.9 Transmission Conductor Plate Repair Could Save $1000s
- mediaThe Autopian: Heres What A Conductor Plate Is And Why It Kills So Many Mercedes Vehicles
- otherCarComplaints: Mercedes 722.9 7G-Tronic Transmission Problems Cause Lawsuit
- mediaMB Medic: 722.9 7G Tronic Automatic Transmission Problems and Solutions
- mediaTransmission Repair Cost Guide: 722.9 Valve Body Problems & Solutions
- videoYouTube - Diagnosing Allison 1000 Transmission TCM Issues on GMC Sierra 3500HD
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.