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P1462 Honda Code - Evaporative Emission Leak Check Module Pressure Decompression Defect

Quick Answer

The P1462 code indicates a malfunction in the Evaporative Emission (EVAP) system, specifically related to the Leak Check Module's pressure decompression function. Common causes include Faulty Vacuum Pump, Faulty Vacuum Pump Motor, Malfunctioning Control Valve. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1462 Honda indicates Evaporative Emission Leak Check Module Pressure Decompression Defect.
Common causes
Common causes include Faulty Vacuum Pump, Faulty Vacuum Pump Motor, Malfunctioning Control Valve.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2025
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Code P1462 Honda Description

The P1462 code indicates a malfunction in the Evaporative Emission (EVAP) system, specifically related to the Leak Check Module's pressure decompression function. The Powertrain Control Module (PCM) initiates a diagnostic process for the EVAP system after the vehicle has been turned off and has met specific conditions, such as the engine coolant temperature and a minimum off time of five hours. During this diagnostic, the PCM reduces pressure between the EVAP canister and the atmosphere to check for leaks or pressure inconsistencies. If the fuel vapor containment valve is open, the entire EVAP system is tested; if closed, only the canister side is evaluated.
OBDII Code P1462 Honda - Evaporative Emission Leak Check Module Pressure Decompression Defect
P1462 Honda Code - Evaporative Emission Leak Check Module Pressure Decompression Defect

Common Causes of P1462 Honda

  1. Faulty Vacuum Pump
  2. Faulty Vacuum Pump Motor
  3. Malfunctioning Control Valve
  4. Excessive flow quantity through the reference orifice
  5. Insufficient flow quantity through the reference orifice

Symptoms of P1462 Honda

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Failed emissions test
  5. Unusual fuel odors around the vehicle

How to Fix P1462 Honda

  1. Perform a thorough diagnostic scan to confirm the P1462 code and check for any additional codes.
  2. Inspect the vacuum pump and its motor for signs of wear or failure, replacing them if necessary.
  3. Examine the control valve for proper operation and replace it if it is malfunctioning.
  4. Check the reference orifice for blockages or damage, ensuring that the flow quantities are within specifications.
  5. Clear the diagnostic codes and conduct a test drive to verify that the issue has been resolved and that the engine light does not reappear.

Cost to Fix P1462 Honda

The cost to diagnose and repair a P1462 code can vary significantly based on the specific issue and the labor rates in your area. Typical parts and labor costs can range from $150 to $600, depending on whether components like the vacuum pump or control valve need replacement. Labor rates generally range from $80 to $150 per hour, with dealerships typically charging more than independent shops. It's advisable to get a detailed estimate from a trusted mechanic, as costs can vary based on location, make and model of the vehicle, and engine type.

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Information for Specific Honda Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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