P0018 Code: Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor A)
If you’ve encountered the P0018 code during a scan of your vehicle’s onboard diagnostic system, fret not! We’re here to discuss its meaning and implications.
So, what does the code P0018 mean? In simple terms, it points to a potential issue with the correlation between the crankshaft position and the camshaft position on Bank 2 Sensor A. Dive in to learn more about this issue as we’ve got you covered with an in-depth exploration of its causes, symptoms, diagnosis, and repair methods.
P0018 Code: An Overview
Check the key information of the P0018 code below!
- Definition: Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor A)
- Severity: High
- DIY Skill Level: Intermediate
- Continue To Drive?: No
- Estimated Repair Cost: $50 – $500
What Does The P0018 Code Mean?
P0018 is an OBD-II generic code indicating a lack of correlation between the signals from the camshaft position (CMP) sensor A for bank 2 and the crankshaft position sensor (CKP). This code is commonly triggered in various car brands such as Ford, Subaru, Chevrolet, Hyundai, Kia, GMC, Mercedes, Toyota, Subaru, Jeep, Audi, and Lexus.
In a typical engine, bank 2 typically refers to the side of the engine that doesn’t house cylinder #1. The “A” sensor is commonly found on the intake camshaft side. It’s important to note that the P0018 code is often associated with other CKP sensor-related codes such as P0016, P0017, and P0019.
The CMP sensor A for bank 2 is responsible for monitoring the position and rotation speed of the camshaft. In contrast, the CKP sensor detects the position and rotation speed of the crankshaft. The Powertrain Control Module (PCM) relies on these signals to properly synchronize the camshaft and crankshaft.
When the PCM detects that the crankshaft and camshaft signals are out of time by a specific number of degrees, it triggers the P0018 code. This means that the correlation between the signals from the CMP sensor A for bank 2 and the CKP sensor is not within the expected parameters. The specific number of degrees may vary depending on the vehicle and manufacturer.
Special Notes
The systems/components involved in triggering this code can vary depending on the specific car brand and model. For example, in General Motors (GM) vehicles, the issue may be related to the CMP actuator solenoid or the timing chain. In Subaru vehicles, it may be associated with the active valve control system (AVCS) and related DTCs. In Ford vehicles, the code may refer to the Variable Camshaft Timing (VCT) system.
Many car manufacturers have issued Technical Service Bulletins (TSBs) related to the P0018 code, indicating a known issue and providing guidance for diagnosis and repair. For instance, the GM TSB 18-144-453 highlights potential causes and solutions for this code. The Subaru TSB 02-163-16R provides inspection and repair procedures for AVCS-related DTCs, including P0018. The Ford TSB 18-2360 addresses concerns with Bank 2 VCT in specific models.
Reminder: Consult the relevant TSBs specific to your vehicle’s make, model, and year for detailed information on diagnosing and resolving the P0018 code.
How Serious is The P0018 Code?
The severity of the P0018 code is typically considered medium to high, depending on the specific circumstances and the extent of the issue. Generally, this code can potentially affect the engine’s performance and fuel efficiency. It is recommended not to continue driving with the P0018 code unresolved for an extended period.
Driving with this code may result in decreased engine performance, rough idling, reduced fuel economy, and potential damage to engine components over time. Ignoring the issue can lead to more severe engine problems and costly repairs. It is advisable to have the vehicle diagnosed and repaired by a qualified mechanic as soon as possible to prevent further damage and ensure optimal engine performance and reliability.
Symptoms of P0018 Code to Watch Out For
The following are common symptoms associated with the P0018 code:
- Check Engine Light (CEL) illuminated
- Engine misfires or runs rough
- Decreased engine performance
- Rough idling or stalling
- Reduced fuel efficiency
- Engine hesitation or surging
Common Causes of P0018 Code
The P0018 code can be triggered by various factors, including:
- Low engine oil level or improper oil viscosity.
- Wiring problems related to the crankshaft or camshaft sensors.
- Damaged or malfunctioning crankshaft or camshaft sensors.
- Timing chain or belt issues (stretching, misalignment, or wear).
- Issues with timing chain tensioner or guides.
- Faulty camshaft variable timing solenoid or variable valve timing (VVT) actuator.
- Engine timing set incorrectly.
- Problems with the VCT unit, such as alignment or solenoid issues (Ford vehicles).
How To Diagnose and Fix The P0018 Code?
This section will provide you with a step-by-step guide to diagnose and resolve the P0018 code. We will walk you through the process of inspecting timing components, sensors, and wiring and guide you on the necessary repairs or replacements to address the issue effectively. Check it out!
Essential Tools and Parts
- OBD-II scanner or scan tool
- Basic hand tools (such as wrenches, sockets, and pliers)
- CKP/CMP sensor
- Timing chain or belt (if necessary)
- Variable valve timing (VVT) solenoid (if necessary)
- Engine oil and oil filter (if required)
Step-by-step Procedure
Step 1: Retrieve DTCs
Scan for codes using an OBD-II scanner or scan tool. If any CKP or CMP sensor-related DTCs are present, prioritize diagnosing and addressing them first. If there are no CKP or CMP sensor-related DTCs, proceed with the following steps.
Step 2: Check Engine Oil
Check the engine oil level and ensure it meets the manufacturer’s specified range. Adjust or replace the engine oil or the oil filter if necessary.
Step 3: Inspect Sensor Wiring
Inspect the wiring related to the crankshaft and camshaft sensors for any damage, loose connections, or corrosion. Repair or replace as needed.
Step 4: Check Timing Components
- Verify that the engine timing is correctly set according to the manufacturer’s specifications.
- Inspect the timing chain or belt, along with the timing chain tensioner and guides, for stretching, misalignment, wear, and proper operation.
- Also, inspect the camshaft variable timing solenoid or variable valve timing actuator for faults, malfunctions, or wear.
Step 5: Clear Codes and Test Drive
Clear all stored codes and test drive the vehicle to verify if the P0018 code returns.
Note: It is recommended to consult the specific service manual for your vehicle make, model, and year to obtain detailed step-by-step instructions tailored to your car.
DIY Repair Level and Estimated Costs
The diagnosis and repair procedure for the P0018 code can range in complexity from intermediate to advanced. Simple tasks such as inspecting the engine oil pressure may be manageable for DIY enthusiasts. However, replacing components like the CMP sensor, timing chain or belt, or VVT solenoid may require advanced mechanical skills and specialized tools. It is advisable to seek assistance from a qualified mechanic or technician if you are unsure about performing the repairs yourself.
The estimated costs for resolving the P0018 code can vary depending on the vehicle make, model, and location. Costs typically involve the price of replacement parts, labor charges, and any additional repairs needed. Below is a breakdown of estimated repair costs for addressing the P0018 code:
| Repair Task | Cost Estimate |
| Engine Oil Change | $50 – $100 |
| Wiring Repair | $50 – $200 |
| Sensor Replacement | $50 – $200 |
| Timing Components Repair/Replacement | $100 – $500 |
Note: Consult with local repair shops or dealerships to obtain accurate estimates for the specific repairs required in your case.
Wrapping Up
In conclusion, it’s important to understand and address the P0018 code to keep your engine running smoothly. By diagnosing and fixing camshaft timing issues, you can improve fuel efficiency, prevent further damage, and ensure your vehicle performs reliably. If you need assistance, consult the service manual or seek professional help.
Feel free to share this helpful information with others. If you have any comments or questions, let us know. For a comprehensive list of OBD codes, you can utilize our OBD Code List Generator tool. Additionally, our OBD code lookup tool can assist you in searching for specific codes and their meanings.
Stay informed and keep your vehicle running smoothly!
Reference Sources
Wikipedia, Timing Chain.
Austin Community College, Variable Valve Timing (VVT).