Removing and installing power and control electronics for electric drive — VW

🧭 Before you start

De-energise the high-voltage system, disconnect the battery earth and drain coolant. Remove the expansion tank, strut and P25 cable, partly release plenum cover and bulkhead, and remove covers, high-voltage harnesses, coolant hoses and power wires. Unbolt JX1, lift it at the front and pull it out. Refit, refill coolant, adapt if renewed and re-energise.

Fits: VW Passat B8 (3G, 2014–)

• Opens: coolant
• Renewed: safety cover with seal

Don't miss

• De-energise the high-voltage system before any work begins.
• Renew the safety cover with its seal after each removal.
• Clamp the coolant hoses with 3094 before pulling them off JX1.
• A renewed JX1 must be adapted to the immobiliser.
• Release the P25 connector in two stages via its locking detents; do not force it.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. De-energise high-voltage system .
2. Disconnect earth cable at battery with ignition switched off Electrical system27Battery; Disconnecting and connecting battery.
3. Drain coolant .
4. Separate electrical connector (3) and unclip line electrical wire from high-voltage cable.
5. Detach coolant expansion tank (1) from bracket. To do this, release catches (2) using a small screwdriver (arrow).

6. Unscrew nut (2) and bolt (4).
7. Remove electrical wire from strut (3).
8. Remove strut (3).
9. Separate high-voltage wire for high-voltage battery charging unit P25(1) from power and control electronics for electric driveJX1.
10. Pull out connector lock (3)(arrow A) to do this.
11. Push locking mechanism (4) in (direction of arrow B), and pull off connector (1) approx. 5 mm until it is engaged in second locking detent.
12. Push locking mechanism (5) in (direction of arrow D), and pull connector off connector mounting (2)(arrow C).
13. Remove high-voltage wire for high-voltage battery charging unit P25 from bracket of power and control electronics for electric driveJX1. [Note: To ensure complete accessibility of the bolts (3), the following measures are necessary.]
14. Only release plenum chamber cover in area of bolt (3); do not remove completely General body repairs, exterior50Bulkhead; Removing and installing plenum chamber cover.
15. Only release bulkhead in area of bolt (3); do not remove completely General body repairs, exterior50Bulkhead; Removing and installing bulkhead.
16. Unscrew bolts (2).
17. Release catch (arrow A).
18. Remove cover (1) in direction of (arrow B) from power and control electronics for electric driveJX1.
19. Release catches (arrows).
20. Remove safety cover (1).
21. Remove bolts (1, 2).
22. Remove bolts (arrows).
23. Pull out high-voltage wiring harness for high-voltage batteryPX1(item 1) and high-voltage wiring harness for drive motorPX2(item 2), and lay it to one side.
24. Remove high-voltage wiring harness for high-voltage batteryPX1 and high-voltage wiring harness for drive motorPX2 from bracket on power and control electronics for electric driveJX1.
25. Fit cover back in place on power and control electronics for electric driveJX1, and secure it with two bolts.
26. Remove bolt (1).
27. Place potential equalisation line (2) to one side.
28. Disconnect electrical connector (1).
29. Clamp off coolant hoses (2) with hose clips3094.
30. Lift retaining clips and remove coolant hoses (2) from power and control electronics for electric driveJX1.
31. Release catches (arrows).
32. Remove cover (5).
33. Remove nut (2).
34. Remove positive wire (1).
35. Remove bolt (3).
36. Remove earth wire (4).
37. Unscrew bolts (2).
38. Lift up power and control electronics for electric driveJX1(1) slightly at front.
39. Pull out power and control electronics for electric driveJX1(1) in direction of (arrow) from base retainer and remove. [Note: Renew safety cover with seal after each removal.]
40. Replenish coolant .
41. If the power and control electronics for electric driveJX1 has been renewed, then the power and control electronics for electric driveJX1 must be adapted to the immobiliser .
42. Re-energise high-voltage system .

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