Technical Description of OBD-II Trouble Code
A high Camshaft Profile Control Circuit in Bank 1
What does that signify?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles. It can affect various car brands such as Volvo, Chevrolet, Ford, Dodge, Porsche, Ford, Land Rover, Audi, Hyundai, Fiat, etc. Although it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
The camshaft is responsible for controlling the positions of the valves. It consists of a shaft with lobes that are designed to open and close the valves at the optimal speed and amount when properly timed. The crankshaft and camshaft are mechanically connected using different methods such as belts or chains.
In the code description, the term “profile” refers to the shape or roundness of the camshaft lobe. Some systems use adjustable lobes to optimize the lobe design for different engine speeds and loads, which can improve volumetric efficiency and other performance aspects based on the driver’s demands. It is important to note that these “new lobes” are often achieved through various strategies, such as switchable or adjustable rocker arm components, rather than physically adding another lobe.
The letter “1” in the description is crucial in this case. It indicates that the code could apply to either side of the camshaft, and there may be two shafts on each cylinder head. Therefore, it is important to identify which camshaft is being referred to before proceeding. Additionally, “bank 1” refers to the side of the engine with cylinder #1. The designation of “A” and “B” for the intake and exhaust camshafts respectively may vary depending on the specific engine design. It is recommended to consult the manufacturer’s service manual for precise information.
The Engine Control Module (ECM) triggers the Check Engine Light (CEL) and displays the code P001C and related codes when it detects a malfunction in the camshaft profile control circuit. P001C is set when there is a high electrical condition within the bank 1 circuit.
What is the severity of this DTC?
The severity is classified as medium. However, this is a general guideline and the severity may vary depending on the specific symptoms and faults experienced. In general, it is advisable to address any hydraulic issues or problems related to internal engine systems as soon as possible. Neglecting these issues can lead to further complications, so it is recommended to have the problem diagnosed and repaired by a professional if necessary.
What are some of the symptoms of the code?
The symptoms of a P001C trouble code may include:
What are some of the common causes of the code?
The causes of the P001C code may include:
What are some P001C troubleshooting steps?
Basic Step #1
The first step is to verify the quality of the engine oil being used. Check the oil level and inspect the cleanliness of the oil. If the oil appears black or dark, it should be replaced along with the oil filter. It is also important to adhere to the recommended oil maintenance schedule. Proper oil maintenance is crucial as contaminated oil can cause malfunctions in the engine’s hydraulic systems, including the camshaft profile control system. Neglecting oil maintenance can lead to sludge formation and other engine system malfunctions. Refer to the service manual for the recommended maintenance schedule and compare it with your service records.
NOTE: Always use the oil viscosity recommended by the manufacturer. Using oil that is too thick or too thin can cause problems in the long run, so ensure that the correct oil is used.
Basic Step #2
Locate the wiring harness, wires, and connectors associated with the camshaft profile control circuit. Use a wiring diagram to assist in identifying the wires. Wiring diagrams can be found in the specific service manual for your vehicle. Inspect all wires and harnesses for any signs of damage or wear. Check the connections at the connectors, as they can become loose due to broken tabs, especially considering the constant engine vibrations in this area.
NOTE: It is recommended to use electrical contact cleaner on the pins and connections to facilitate easy connection and disconnection of the connectors during the troubleshooting process and for future maintenance as well.
