Mercedes 722.9 Y3/8n1 & Y3/8n2 Repair Service
Pelican Diagnostics UK provides a specialist Mercedes 722.9 conductor plate repair service for 7G-Tronic automatic gearboxes suffering from conductor plate and speed sensor faults.
This service restores full gearbox functionality by repairing internal faults within the VGS conductor plate assembly.
- Service Type: Mercedes 722.9 Repair
- Fault Codes: Y3/8n1, Y3/8n2
- Turnaround: 24–48 hours after receipt
- Important: Conductor plate / VGS unit must be sent to us
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How to Order
- Remove the 722.9 conductor plate (VGS unit) from your gearbox.
- Package securely with your contact details and fault description.
- Send the unit to:
Pelican Diagnostics
Padley Farm, Drove Lane
Sleaford
NG34 8JQ
Your repaired unit will be returned within 24–48 hours ready for refitting.
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Supported Fault Codes
- Y3/8n1 (Turbine Speed Sensor Fault)
- Y3/8n2 (Internal Speed Sensor Fault)
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Compatible Mercedes Models
This fault commonly affects vehicles fitted with the Mercedes 722.9 (7G-Tronic) gearbox, including:
- C-Class (W204, W205)
- E-Class (W211, W212)
- S-Class (W221, W222)
- CLS (W218)
- ML / GLE (W164, W166)
- GL / GLS (X164, X166)
- Sprinter (selected models)
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Common Fault Symptoms
- Gearbox stuck in limp mode
- Harsh or delayed gear changes
- No gear engagement
- Engine revs but no drive
- Transmission warning messages
- Diagnostic codes Y3/8n1 or Y3/8n2
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Our Repair Solution
We carry out component-level repairs to the conductor plate, resolving internal speed sensor failures and restoring full communication with the transmission control system.
This provides a reliable and cost-effective alternative to replacing the entire gearbox or conductor plate assembly.
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Important Information
- This service is for the repair of your original conductor plate only
- No coding is typically required after refitting the repaired unit
- Ensure gearbox oil contamination or wiring faults are ruled out before sending
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Contact Pelican Diagnostics UK
- 📧 Email: contact@pelicandiagnostics.uk
- 📱 WhatsApp: Send us a WhatsApp message
- 📍 Address: Pelican Diagnostics, Padley Farm, Drove Lane, Sleaford, NG34 8JQ
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FAQs – Mercedes 7G Tronic Conductor Plate Repair
What do Y3/8n1 and Y3/8n2 faults mean?
These faults indicate internal speed sensor failures within the 722.9 conductor plate assembly.
Do I need to replace the gearbox?
No. In most cases, the issue can be resolved by repairing the conductor plate rather than replacing the gearbox.
Do I need to send the module?
Yes. The conductor plate (VGS unit) must be removed and sent to us for repair.
Is coding required after repair?
No. The repaired unit is typically plug and play when refitted.
How long does the Mercedes 722.9 Repair repair take?
Turnaround is usually 24–48 hours after we receive your unit.
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