Mercedes GLC ISM Repair — No Drive Fault | The Vehicle Check
The Mercedes GLC X253, fitted with the 9G-Tronic automatic gearbox and electronic direct select system, uses an ISM module that is susceptible to specific failure modes. When the GLC ISM fails, the gearbox produces no drive — the Drive position is selected but there is no forward or reverse movement. P0705 and P0706 fault codes are typically stored. The Vehicle Check repairs and clones Mercedes GLC ISM modules at component level via our nationwide mail-in service.
GLC ISM Fault Symptoms and Causes
The Mercedes GLC ISM failure typically presents as a sudden no-drive condition — the vehicle was running normally, was parked, and on the next start there is no drive in any gear. The electronic Direct Select lever on the centre console continues to operate and display current selection, but the gearbox does not respond.
Internal power transistor failure and connector corrosion are the primary causes on the GLC. The GLC's ISM is more exposed to environmental variation than equivalent saloon models due to its higher ground clearance and off-road capability, which can accelerate connector degradation.
GLC ISM Repair and Cloning
We carry GLC X253 specific ISM test data and components. Our bench test replicates the GLC ISM operating environment and identifies the exact failed component. Component-level repair is carried out and the module is tested before return.
Where the ISM requires cloning we transfer all data to a tested donor GLC ISM — no dealer programming required after fitting.
Post Your GLC ISM to Us
Post your GLC ISM to The Vehicle Check, Enfield EN3 7PH. We return it repaired or cloned in 2 to 3 working days. Call 0203 489 2610.
Send Your Unit Today
The Vehicle Check | Unit 8 Solway Business Centre | Tysoe Street | Enfield | EN3 7PH
📞 0203 489 2610 | 📧 info@thevehiclecheck.co.uk
Nationwide mail-in postal service. All work covered by our repair warranty.