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Transmission Fault Warning:
Mercedes 722.8 TCU speed sensor faults can affect gear shifts, vehicle speed readings, and ABS/traction control.
Immediate specialist diagnostics are recommended.
About 722.8 TCU Speed Sensor Faults
The 722.8 7G-Tronic transmission relies on speed sensors to monitor input, output, and wheel speeds. Faulty sensors can trigger error messages, limp mode, or harsh shifting.
Common Causes
- Defective input or output speed sensors
- Wiring harness damage or corrosion
- TCU communication errors
- Sensor alignment or gear train issues
- Aftermarket modifications or voltage spikes
Symptoms
- Dashboard warning lights related to transmission
- Limp mode engagement or erratic shifting
- Incorrect speedometer readings
- ABS / traction control alerts
- Failure to engage gears smoothly
Our Repair Solutions
We specialise in Mercedes 722.8 TCU speed sensor fault diagnosis and repair in London. Our approach focuses on the root cause — sensor replacement, TCU reconditioning, or wiring correction — avoiding unnecessary full transmission replacement.
Questions About Your 722.8 TCU?
Our product specialists are ready to assist — don’t hesitate to get in touch.
📞 Call 07779 836677