P0398 - Understanding DTC P0398: A Guide for 2015-2018 Honda Accord Owners

Quick Answer

P0398 means: P0398 indicates a high input signal from the camshaft position sensor 'B', affecting engine timing.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0398? Immediate attention is recommended to prevent potential engine damage.

Common Questions

What does P0398 mean and how does it affect my car?

P0398 indicates a high input signal from the camshaft position sensor 'B'. This can lead to performance issues like rough idling and stalling, affecting your vehicle's reliability. It's essential to address this code quickly to avoid more severe engine problems.

What are the most common causes of P0398 and how much does it cost to fix?

Common causes include a faulty camshaft position sensor, damaged wiring, or even ECM issues. Repair costs typically range from $150 to $300 for sensor replacement, depending on the make and model.

Can I drive my car with P0398 or should I stop immediately?

It's not advisable to drive with P0398 as it can cause performance issues and potentially damage the engine. It's best to have it diagnosed and repaired as soon as possible.

How can I diagnose P0398 myself using GeekOBD APP?

Use the GeekOBD APP to scan for DTCs, review freeze frame data, and check the camshaft position sensor readings. Look for any unusual voltage levels that could indicate a problem.

What vehicles are most commonly affected by P0398?

Commonly affected vehicles include the 2015-2018 Honda Accord and certain models from Ford and Toyota. Always check for recalls or TSBs related to camshaft position issues.

How can I prevent P0398 from happening again?

Regular maintenance, including timely oil changes and inspections of electrical components, can help prevent P0398. Also, consider using protective covers to shield sensors from environmental damage.

What is P0398?

The P0398 diagnostic trouble code (DTC) indicates an issue with the camshaft position sensor 'B' circuit high input. In simpler terms, this code means that the Engine Control Module (ECM) has detected a problem with the signal it receives from the camshaft position sensor. This sensor plays a crucial role in the engine timing process, as it helps the ECM determine the position of the camshaft, which is essential for optimal engine performance. If the ECM receives a voltage that is higher than expected from this sensor, it triggers the P0398 code. For car owners, this can lead to various performance issues, such as rough idling, decreased fuel efficiency, and even engine stalling in severe cases. Understanding this code is particularly important for owners of vehicles like the 2015-2018 Honda Accord, as they are commonly prone to this issue. Ignoring the P0398 code could lead to more significant engine problems down the road, making it vital to address it promptly.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0398 is present:

  • Check engine light stays on constantly, indicating the need for immediate diagnosis.
  • Engine hesitates during acceleration, leading to a frustrating driving experience.
  • Fuel economy decreased by 10-15%, resulting in higher fuel expenses.
  • Rough idling or stalling when the engine is at a stop, making the vehicle less reliable.
  • Difficulty starting the engine, which can leave you stranded if not addressed.

Possible Causes

Most common causes of P0398 (ordered by frequency):

  1. Faulty camshaft position sensor (approximately 40% likelihood) - This is the most common cause, often due to wear and tear or exposure to extreme temperatures.
  2. Damaged wiring or connectors (30% likelihood) - Corroded or frayed wires can disrupt the signal between the sensor and the ECM.
  3. Faulty ECM (15% likelihood) - Although rare, a malfunctioning ECM can misinterpret signals from the sensor.
  4. Timing chain or belt issues (10% likelihood) - Problems with these components can affect camshaft positioning.
  5. Less common cause: Oil contamination in the sensor area can lead to signal disruptions.

P0398 Repair Costs

Cost Breakdown by Repair Type

Camshaft Position Sensor Replacement

Replacing the faulty camshaft position sensor to restore proper function.

  • Total: $150 - $300
  • Success rate: 90%
Wiring and Connector Repair

Repairing or replacing damaged wiring or connectors to ensure proper signal transmission.

  • Total: $100 - $250
  • Success rate: 85%
Money-Saving Tips for P0398
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0398 Diagnosis Process

Follow these systematic steps to accurately diagnose P0398. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to test the camshaft position sensor and wiring for continuity and voltage (20-30 minutes)

Step 3: Component testing - Use a multimeter to test the camshaft position sensor and wiring for continuity and voltage (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure no codes return (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: P0398 Repair on a 2016 Honda Accord

Vehicle: 2016 Honda Accord, 75,000 miles

Problem: Customer noticed a persistent check engine light and rough idling.

Diagnosis: After running a diagnostic with the GeekOBD APP, the P0398 code was confirmed. A visual inspection revealed damaged wiring.

Solution: Replaced the camshaft position sensor and repaired the wiring harness.

Cost: $250 (including parts and labor)

Result: After the repair, the check engine light cleared, and the engine ran smoothly.

Case Study 2: P0398 Code on a 2017 Ford Fusion

Vehicle: 2017 Ford Fusion, 60,000 miles

Problem: Owner reported engine stalling intermittently.

Diagnosis: Diagnostic scan revealed P0398; further testing confirmed a faulty camshaft position sensor.

Solution: The camshaft position sensor was replaced, and the code was cleared.

Cost: $180 (parts and labor)

Result: Post-repair, the engine performance improved significantly, and stalling ceased.

Diagnose P0398

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P0398
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes