U3478 Porsche 911 Type 991 OBD Code

OBD/2 U3478 error code description and symptoms.

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code U3478

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

U3478 Porsche 911 Type 991 Error Code Repair Process :

For egr calibration low check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. U3478 error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks egr calibration low with your car's computers to find out exactly what's prompting the light to turn on.

Difficulty Level (Expert)

Repair Time (35 Min.)

Cost Prediction : $ 70-120

Common Causes of Porsche 911 Type 991 U3478 OBD2 Code

A common cause of code U3478 is the failure of EGR Calibration Low, but there are several other possible causes as well, such as ;

• Continuous oil flow to the VCT piston chamber
• Faulty Mass Air Flow (MAF) sensor
• Engine Control Module (ECM)
• Spark plugs may be faulty

U3478 is a kind of Network Trouble Code U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

U3478 code for other Porsche cars

You can view according U3478 DTC for your car model. We selected several models to see obd2 solutions click and view it.

• U3478 Porsche 1300
• U3478 Porsche 3400
• U3478 Porsche 356
• U3478 Porsche 550
• U3478 Porsche 718
• U3478 Porsche 804
• U3478 Porsche 901
• U3478 Porsche 904
• U3478 Porsche 906
• U3478 Porsche 907
• U3478 Porsche 908
• U3478 Porsche 910
• U3478 Porsche 911
• U3478 Porsche 911 Type 996
• U3478 Porsche 911 Type 997
• U3478 Porsche 912
• U3478 Porsche 914
• U3478 Porsche 917
• U3478 Porsche 924
• U3478 Porsche 928
• U3478 Porsche 930
• U3478 Porsche 931
• U3478 Porsche 935
• U3478 Porsche 936
• U3478 Porsche 937
• U3478 Porsche 944
• U3478 Porsche 959
• U3478 Porsche 962
• U3478 Porsche 964
• U3478 Porsche 965
• U3478 Porsche 968
• U3478 Porsche 986
• U3478 Porsche 993
• U3478 Porsche 996
• U3478 Porsche Boxster
• U3478 Porsche Boxster Type 981
• U3478 Porsche Boxster Type 986
• U3478 Porsche Boxster Type 987
• U3478 Porsche Carrera Gt
• U3478 Porsche Cayenne
• U3478 Porsche Cayenne Type 92a
• U3478 Porsche Cayenne Type 9pa
• U3478 Porsche Cayman
• U3478 Porsche Cayman Type 718
• U3478 Porsche Cayman Type 981
• U3478 Porsche Cayman Type 987
• U3478 Porsche Coupe
• U3478 Porsche Dp
• U3478 Porsche Gt
• U3478 Porsche Gt2
• U3478 Porsche Gt3
• U3478 Porsche Karisma
• U3478 Porsche Kremer
• U3478 Porsche Macan Type 95b
• U3478 Porsche Mega
• U3478 Porsche Panamera Type 970
• U3478 Porsche Panamericana
• U3478 Porsche Rsk
• U3478 Porsche Tapiro

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