P179D Porsche Cooling Oil Valve Electrical Fault
Porsche Macan – P179D Cooling Oil Valve Electrical Fault
Symptoms of a faulty or failed Mechatronic unit can be poor gear selection or even no gear selection at all.
The following fault codes may have been recorded and could point to a faulty Mechatronic unit.
- DTC P17D8 (Torque limitation because of clutch temperature) with symptom code 8040
- DTC P0726 (RPM signal of engine control unit, implausible signal) with symptom code 7980
- DTC P174B (Valve 4 in the sub-gearbox 1, electric fault) with symptom code 8027
- DTC P174F (Valve 4 in the sub-gearbox 2, electric fault) with symptom code 8028
- DTC P179C (Main pressure valve, electric fault) with symptom code 8029
- DTC P179D (Coolant oil valve electrical fault) with symptom code 8030
- DTC P174C (Partial transmission 1 valve 2 Electrical error ) with symptom code 8026
- DTC P174A (Valve 3 in the sub-gearbox 1, electric fault) with symptom code 8939
- DTC P174E (Valve 3 in the sub-gearbox 2, electric fault) with symptom code 8940
- DTC P1740 (Clutch temperature monitoring) with symptom code 8031
If the above message shows, protective functions are activated to minimise or prevent damage occurring, but result in a loss of performance.
P179D00 Cooling Oil Valve – Electrical Fault Porsche Macan
Technical Background
Poor internal contact area on circuit board will lead to faults. Oil additives can cause the plastic circuit plates to delaminate, causing contact loss.
Production Solution
Improved circuit board for mechatronics unit.
Component overview
Removing and installing control mechanism for transmission
Adjusting shift forks and gear actuators
Replace Porsche Mechatronics Repair Kit 9A730190100 / 0B5398009F
Starting with the 2x larger protectors, which fit nicely on the larger two valves
Then I fitted the two cross shaped protectors as per the instructions
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