What does DTC fault code P001C mean?
The P001C fault code, applicable to all car manufacturers, means “A Camshaft Profile Control Circuit High (Bank 1)“.
Background Information: The camshaft controls the opening and closing of the valves. In a variable valve timing system, the electronic camshaft adjusting valve (or oil control valve, OCV) adjusts the camshaft angle by changing the oil pressure to the camshaft adjuster (mechanical type) according to instructions from the engine control module (ECM), ensuring the valves open and close at optimal times. This optimizes engine efficiency and power across all engine speeds. This fault code appears if the electronic control unit (ECU) detects that the voltage of the A (intake/left/front) camshaft profile control circuit is higher than the calibrated maximum value for a period of time.
Common Problems with P001C Code
- Reduced engine performance
- Increased fuel consumption
- Camshaft variable timing solenoid failure
- Low engine oil level
- Incorrect engine timing
- Engine oil does not meet manufacturer specifications
- Variable valve timing actuator failure
- Timing chain wear
Most Common Causes of P001C
The P001C code is typically triggered by problems affecting the camshaft profile control circuit. The following causes are listed in order of likelihood, based on real-world service data:
- Camshaft actuator failure (e.g., VVT solenoid or Valvetronic motor)
- Wiring problems – voltage short circuits, open circuits, or damaged insulation
- Camshaft position sensor (CMP sensor) failure
- Connector problems – loose, corroded, or damaged wiring harness connections
- ECM/PCM failure (less common)
- Oil flow problems (e.g., low oil level or poor oil quality affecting actuator operation)
Vehicles Most Often Affected by P001C
- This code is most common in modern vehicles equipped with advanced camshaft profile control systems. The following models and brands report a higher-than-average frequency of P001C:
- Ford (Focus, Fusion, Escape, EcoBoost engines)
- BMW (3 Series, 5 Series, X3, X5, with Valvetronic/VANOS systems)
- General Motors (Chevrolet Malibu, Equinox, GMC Terrain with VVT engines)
- Some Jaguar and Land Rover models (Ingenium engines)
- Mini Cooper (using Valvetronic technology)
P001C Troubleshooting Steps
1.First, you need to check the overall integrity of the engine oil currently in use. If the oil level is normal, check the cleanliness of the oil itself. If it is black or dark, change the oil and filter. Also, always pay attention to your oil change schedule. This is especially important in this case, as the oil can become progressively contaminated if oil maintenance is neglected. This is a problem because accumulated sludge or debris can cause malfunctions in the engine’s hydraulic systems (such as the camshaft profile control system). Oil sludge is another consequence of poor oil maintenance, and it can also lead to malfunctions in various engine systems. That being said, please refer to your service manual for the maintenance schedule and compare it to your service records. This is very important!
Note: Always use the engine oil viscosity recommended by the manufacturer. Oil that is too thick or too thin can cause problems in the future, so please confirm before purchasing.
2.Use a professional-grade OBD-II scanner to scan for stored codes and freeze frame data. Locate the wiring harness, wires, and connectors used in the camshaft profile control circuit. You will need to find a wiring diagram to help identify the wires. Relevant diagrams can be found in your vehicle’s specific repair manual. Check all cables and harnesses for signs of damage or wear. Connections should also be checked. It is common for connectors to become loose due to broken latches. This is especially true for these connectors, as they are susceptible to the constant vibrations of the engine.
Note: During your repair process and in the future, it is recommended to use electrical contact cleaner to clean the pins and connection points, making connecting and disconnecting the connectors easier.
Possible Repairs for P001C Fault
The correct solution for the P001C code depends on the specific cause found during diagnosis. The following are the most common solutions:
- Replace the defective camshaft actuator (VVT solenoid or Valvetronic motor)
- Repair or replace damaged wiring or connectors in the camshaft profile control circuit
- Replace the defective camshaft position sensor
- If the oil level or oil quality is insufficient, add or change the oil
- If a software issue is found, update or reprogram the ECM/PCM
- Only replace the ECM/PCM after thoroughly confirming it is defective (very rare).
P001C Quick FAQ
Here are answers to the most common questions about this code:
Q: Can poor oil changes cause P001C?
A: Yes – poor quality oil or low oil levels can affect the function of the camshaft actuator, leading to this code.
Q: Does P001C mean my engine will fail soon?
A: Not immediately, but neglecting the code increases the risk of more costly damage over time. Prompt diagnosis and repair are recommended.
How serious is the P001C code?
The seriousness of a stored P001C fault code lies in the fact that the conditions associated with the fault code affect how the engine starts and runs. This can affect vehicle driving safety, especially when dealing with poor acceleration that often accompanies the P001C fault code.