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P2646 Honda: Understanding the Code and Its Causes, Symptoms, and Solutions

When the check engine light in your Honda vehicle turns on, it can be a cause for concern. One of the codes that may appear on the diagnostic screen is P2646. This code refers to a problem with the rocker arm oil pressure switch circuit. In this article, we will discuss what the P2646 Honda code means, its causes, symptoms, and solutions.

What Does the Code P2646 Honda Mean?

The P2646 code is a generic powertrain code, which means it applies to all vehicles equipped with OBD-II systems. The code is triggered when the Engine Control Module (ECM) detects an issue with the rocker arm oil pressure switch circuit. The rocker arm oil pressure switch is responsible for monitoring the oil pressure in the engine. When the switch detects low oil pressure, it sends a signal to the ECM, which in turn illuminates the check engine light and sets the P2646 code.

Honda P2646 Code Causes

There are several possible causes for the P2646 code to be set in a Honda vehicle. Some of the most common include:

  • A faulty rocker arm oil pressure switch
  • Low oil pressure due to a clogged oil filter or low oil level
  • A malfunctioning oil pump
  • A damaged or worn oil pressure relief valve
  • A damaged or worn engine oil pickup tube

P2646 Honda Code Symptoms

When the P2646 code is set in a Honda vehicle, it may exhibit a number of symptoms, including:

  • Illumination of the check engine light
  • Reduced engine power
  • Reduced fuel economy
  • Unusual engine noises
  • Warning messages on the dash display

How to Fix P2646 of Honda?

The solution to the P2646 code will depend on the cause of the problem. Some of the most common fixes include:

  • Replacing the rocker arm oil pressure switch
  • Replacing the oil filter
  • Adding engine oil
  • Replacing the oil pump
  • Replacing the oil pressure relief valve
  • Replacing the engine oil pickup tube

You can follow this video tutorial in order to solve the Code P2646 on Honda also.

How Much Does It Cost to Fix P2646 Honda code?

The cost to fix the P2646 code will depend on the cause of the problem and the specific make and model of the vehicle. Replacing the rocker arm oil pressure switch is typically the cheapest solution, and it can cost anywhere from $50 to $100. Replacing the oil pump or oil pressure relief valve, on the other hand, can cost several hundred dollars. It’s always recommended to get a proper diagnosis and estimate from a mechanic before proceeding with any repairs.

In conclusion, the P2646 code is a common issue in Honda vehicles, and it can be caused by a variety of problems related to the rocker arm oil pressure switch circuit. If you notice any symptoms of this code, it’s important to take your vehicle to a mechanic as soon as possible to avoid further damage to the engine.