P029D Porsche 904 OBD Code

OBD/2 P029D error code description and symptoms.

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position. Cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) P029D DTC is a check of the VCT unit.

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.

P029D Porsche 904 Error Code Repair Process :

OBD P029D code and tailpipe testing are two different approaches to identify vehicles in need of repair. The OBD system looks for broken or malfunctioning emissions control components and evaporative emission control system vent control circuit shorted, while tailpipe tests sample a vehicle's exhaust to see if it is above or below certain prescribed limits. Given the robust nature of today's emissions control components, it is entirely possible for an individual component to P029D malfunction without leading to an immediate increase in emissions at the tailpipe. In such cases, other components (like the catalyst) can temporarily compensate for the part that is broken however, these other components can only do double duty for so long before they, too, begin to malfunction. In addition, OBD also monitors for P029D and other malfunctions in the fuel system problems that traditional tailpipe tests were not designed to identify. Most state and local areas also include a gas cap pressure test as part of an emission inspection.

Difficulty Level (Expert)

Repair Time (35 Min.)

Cost Prediction : $ 50-100

Common Causes of Porsche 904 P029D OBD2 Code

A common cause of code P029D is the failure of Evaporative Emission Control System Vent Control Circuit Shorted, but there are several other possible causes as well, such as ;

• Camshaft advance mechanism binding (VCT unit)
• EVAP system hose leaking
• Faulty variable valve timing (VVT)
• Failures of clutch motion/travel sensors.

P029D is a kind of Powertrain Trouble Code Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

P029D code for other Porsche cars

You can view according P029D DTC for your car model. We selected several models to see obd2 solutions click and view it.

• P029D Porsche 1300
• P029D Porsche 3400
• P029D Porsche 356
• P029D Porsche 550
• P029D Porsche 718
• P029D Porsche 804
• P029D Porsche 901
• P029D Porsche 906
• P029D Porsche 907
• P029D Porsche 908
• P029D Porsche 910
• P029D Porsche 911
• P029D Porsche 911 Type 991
• P029D Porsche 911 Type 996
• P029D Porsche 911 Type 997
• P029D Porsche 912
• P029D Porsche 914
• P029D Porsche 917
• P029D Porsche 924
• P029D Porsche 928
• P029D Porsche 930
• P029D Porsche 931
• P029D Porsche 935
• P029D Porsche 936
• P029D Porsche 937
• P029D Porsche 944
• P029D Porsche 959
• P029D Porsche 962
• P029D Porsche 964
• P029D Porsche 965
• P029D Porsche 968
• P029D Porsche 986
• P029D Porsche 993
• P029D Porsche 996
• P029D Porsche Boxster
• P029D Porsche Boxster Type 981
• P029D Porsche Boxster Type 986
• P029D Porsche Boxster Type 987
• P029D Porsche Carrera Gt
• P029D Porsche Cayenne
• P029D Porsche Cayenne Type 92a
• P029D Porsche Cayenne Type 9pa
• P029D Porsche Cayman
• P029D Porsche Cayman Type 718
• P029D Porsche Cayman Type 981
• P029D Porsche Cayman Type 987
• P029D Porsche Coupe
• P029D Porsche Dp
• P029D Porsche Gt
• P029D Porsche Gt2
• P029D Porsche Gt3
• P029D Porsche Karisma
• P029D Porsche Kremer
• P029D Porsche Macan Type 95b
• P029D Porsche Mega
• P029D Porsche Panamera Type 970
• P029D Porsche Panamericana
• P029D Porsche Rsk
• P029D Porsche Tapiro

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