P145C Honda Code: Expert Tips for Emission System Repairs

When the P145C code appears on your Honda’s diagnostics, confusion can set in. This article acts as your guiding light through this issue. We’ll provide a breakdown of the code’s meaning, symptoms, and causes.

A step-by-step guide will be below for you to address the P145C Honda code. Whether you’re a hands-on enthusiast or seeking professional help, the process is made clear, empowering you to tackle the issue effectively.

Let’s explore!

P145C Honda Code: A Quick Overview

Take a look at the summary of the Honda P145C code provided below!

Definition: EVAP System Purge Flow Malfunction
Severity: Medium
DIY Skill Level: Intermediate
Continue To Drive?: Yes (Short term)
Estimated Repair Cost: $50 – $500

What Does The P145C Honda Code Mean?

The P145C trouble code is a manufacturer-specific code. It is titled as an “EVAP System Purge Flow Malfunction” or “Fuel Tank Pressure Sensor Range/Performance Problem” by the Honda car manufacturer.

This code is triggered when the car’s Powertrain Control Module (PCM) detects a malfunction within the EVAP system of your Honda. In most cases, the culprit is likely the wrong fuel tank pressure sensor readings.

P145C Honda — *The P145C code in Honda usually comes with P0497 or P0496, indicating the problem within the EVAP system.*
*(Credit: crvownersclub.com*)

Let’s explore briefly the EVAP system – The purpose of the EVAP system is to capture and manage fuel vapors generated in the fuel system. This system prevents fuel vapors from escaping into the environment. It includes components like the fuel tank, charcoal canister to trap vapors, purge valve, vent valve, sealed fuel filler cap, pressure sensors, and various lines.

The P145C code is commonly found in various Honda models, including but not limited to: Civic, Accord, CR-V, HR-V, Pilot, Odyssey, etc.

In some cases, the P145C code might be accompanied by other related codes that provide more information about the specific nature of the problem. These accompanying codes might include the following:

P1456: Evaporative Emissions Control System Leakage (Fuel Tank System)
P0443: Evaporative Emission Control System Purge Control Valve Circuit
P0496: EVAP Flow During A Non-Purge Condition
P0497: Evaporative Emission System Low Purge Flow

How Severe Is The P145C Code In Your Honda?

The P145C code found in Honda vehicles has a moderate severity level. It’s possible to drive, but short-term driving is allowed (within a range of 30 to 50 miles). Prolonged driving without addressing the issue could lead to increased emissions and reduced fuel efficiency.

It’s still recommended to have the issue addressed as soon as possible. Continuing to drive with a malfunctioning EVAP system can have negative effects on the environment and vehicle performance. After reaching your destination, consider scheduling a diagnostic check with a qualified technician. Timely repairs will prevent further complications and maintain the vehicle’s efficiency and emission control.

What Are The Signs Of The P145C Code On Honda Vehicles?

The presence of the “P145C” code in Honda vehicles is often accompanied by the following symptoms:

Check Engine Light (MIL) illuminated
Decreased fuel efficiency
Increased emissions
Difficulty starting the engine
Engine stalling

What Are The Causes Of The P145C Honda Code?

There are various factors can trigger the P145C code in Honda vehicles, including:

Malfunctioning evaporative emission canister vent shut valve
Wiring or electrical connectivity problems within the EVAP system
Defective evaporative emission canister purge valve
Hose leaks or blockages in the EVAP system
Corrosion or damage to relevant components
Faulty fuel tank pressure sensor
PCM issues

How To Diagnose And Fix The P145C Code On Honda?

When your Honda vehicle displays the “P145C” code, addressing it promptly is crucial. This section outlines the essential tools, a step-by-step procedure, and estimated costs associated with diagnosing and repairing the issue:

Essential Tools And Parts

To diagnose and repair the “P145C” code effectively, ensure you have the following tools and parts at hand:

OBD-II scanner
Multimeter
Wiring and connectors
Replacement EVAP components (vent shut valve, purge valve) if necessary.

Step-by-Step Procedure

1. Retrieve Diagnostic Trouble Codes (DTCs)

Use the OBD-II scanner to retrieve the P145C code, additional codes and associated freeze frame data. This will help you pinpoint the exact issue within the EVAP system.

2. Visual Inspection Of Wiring And Connections

Thoroughly inspect the wiring and connections related to the EVAP system for signs of damage, corrosion, or loose connections. Pay close attention to the wiring harnesses, connectors, and terminals.
Address any issues found during this inspection.

3. Test Evaporative Emission Canister Vent Shut Valve And Purge Valve

Using a digital multimeter, perform voltage and resistance tests on both the evaporative emission canister vent shut valve and the purge valve.
Follow the manufacturer’s specifications for proper voltage and resistance values.
Replace any valve that does not meet the specified values.

4. Check Hoses For Blockages Or Leaks

Inspect all hoses within the EVAP system for blockages, kinks, or leaks. Ensure that hoses are properly connected and free from obstructions.
Replace any damaged hoses to restore proper airflow within the system.

5. Fuel Tank Pressure Sensor Inspection

Examine the fuel tank pressure sensor for any signs of damage or malfunction.

6. Update PCM Software

Check if there are any available software updates for the Powertrain Control Module (PCM) related to the EVAP system.
If updates are available, follow the manufacturer’s instructions to update the PCM software. This can sometimes address compatibility issues and improve system performance.
In case the PCM completely fails, find a skilled Honda mechanic nearby for replacement.

7. Clear The Codes And Test Drive

After conducting all procedures, clear the codes by using an OBD scanner. Then, perform a test drive to see if the codes come back or not.

Learn how to address the Honda P145C code with the step-by-step guide video by Whyingo.

Note:

Make sure to save all the free data about the issue and any on-board snapshots.
If any of the codes (P0496, P0497) appear along with P145C, start by fixing those codes, then check for P145C again. If both codes P0497 and P145C are stored together, inspect the line that connects the EVAP canister purge valve and the EVAP canister. Look for poor connections, blockages, or damage. Also, check if the EVAP canister purge valve is stuck closed.

DIY Repair Level And Estimated Costs

The repair procedure for the “P145C” code involves a moderate to advanced level of automotive expertise. Additionally, it requires diagnostic tools and component testing skills. If you’re confident in your abilities, you may attempt the repairs. However, if you’re unsure or inexperienced, seeking professional assistance is recommended to avoid complications.

Here’s an approximate cost breakdown for key tasks related to resolving the P145C code:

Repair Task	Estimated Cost
Wiring and connector repair	$50 – $150
EVAP vent shut valve replacement	$50 – $200
EVAP canister purge valve replacement	$50 – $200
EVAP system blockage or leak repair	$50 – $300
Fuel tank pressure sensor	$100 – $250
PCM software update or replacement	$100 – $1,500

Keep in mind that these costs can vary based on factors like your vehicle’s make and model, as well as your location. If you’re uncertain about any aspect of the repair process or lack experience, consulting a certified mechanic is a prudent step to ensure an effective and safe resolution of the issue.

P145C Honda Infographic

Final Thoughts

Facing the P145C code in your Honda vehicle might seem daunting, but armed with knowledge and guidance, you’re well-equipped to address the issue.

Remember, proper diagnosis and timely repairs are essential for maintaining optimal vehicle performance and minimizing emissions. Whether you’re a seasoned DIY enthusiast or prefer leaving it to the experts, taking action now ensures a smoother ride ahead.

If you found this guide helpful, share it with fellow Honda owners who might benefit.

Feel free to leave your comments and questions below – we’re here to assist you on your automotive journey. Safe travels and happy troubleshooting!

Reference Sources

HONDA DTC CODES – page 6
JustAnswer, 2007 Honda Truck Odyssey V6-3.5L