Removing and installing engine control unit J623, CC — VW
Removing and installing engine control unit J623, CC on VW: 16 steps, engines CUVA, CUVC, CUVE, CUWA.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Tiguan I (5N, 2007–2016), VW CC (358, 2012–2017), VW Sharan II / SEAT Alhambra (7N, 2010–)
📋 Procedure
- If the engine control unit is to be renewed, switch on ignition, and select the following menu options on vehicle diagnostic tester:
- Switch off ignition and remove ignition key.
- Remove wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
- Remove plenum chamber cover General body repairs, exterior50Plenum chamber bulkhead; Assembly overview - plenum chamber cover.
- Detach wiring harness for engine control unit from inner side of plenum chamber bulkhead.
- Remove plenum chamber bulkhead General body repairs, exterior50Plenum chamber; Assembly overview - plenum chamber cover.
- Release feed-through for wiring harness (arrow), and pull it off upwards.
- Detach wiring harness for engine control unit.
- Release and pull off connector on wiper motor Electrical system92Windscreen wiper system; Removing and installing windscreen wiper system.
- Pull engine control unit as far as possible towards front right wheel housing.
- Detach engine control unit from plenum chamber.
- Push down retaining frame in direction of (arrow) and remove engine control unit.
- Push locking devices of connectors in (direction of arrow) and pull off connectors.
- Fit connectors to engine control unit.
- Push locking devices to stop in (direction of arrow).
- Insert engine control unit into retaining frame and push retaining frame upwards in direction of (arrow).
Other VW procedures
- Removing and installing exhaust gas temperature sender 2G448, Sharan and Tiguan
- Checking delivery pressure and quantity for fuel system pressurisation pump G6
- Removing and installing exhaust gas recirculation control motor 2V339
- Removing and installing radiator cowl with radiator fan, CC
- Filling, bleeding fuel system – VW Touareg II
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.