AutoCodes – Honda – P027F Honda

P027F Honda Code - Cold Start Air Fuel Ratio Control System Command Rich

Quick Answer

The cold start emission reduction strategy controls air-fuel ratio to lean when the engine is started at cold conditions to lower the emission while the catalyst is not warmed up enough. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module circuit poor electrical connection. 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: P027F Honda indicates Cold Start Air Fuel Ratio Control System Command Rich.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module circuit poor electrical connection.
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.

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Code Popularity 305

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P027F Honda Description

The cold start emission reduction strategy controls air-fuel ratio to lean when the engine is started at cold conditions to lower the emission while the catalyst is not warmed up enough. If the commanded air-fuel ratio is too lean or too rich compared to the target air-fuel ratio, the Powertrain Control Module (PCM) detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P027F Honda - Cold Start Air Fuel Ratio Control System Command Rich - AutoCodes.com — P027F Honda Code - Cold Start Air Fuel Ratio Control System Command Rich

What does this mean?

What are the Possible Causes of the DTC P027F Honda?

Faulty Powertrain Control Module (PCM)
Powertrain Control Module harness is open or shorted
Powertrain Control Module circuit poor electrical connection

How to Fix the DTC P027F Honda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P027F Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P027F Honda code?

Need more information on how to fix the P027F Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P027F Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda Models

P027F 2016 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich
P027F 2017 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich
P027F 2018 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich
P027F 2019 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich
P027F 2020 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich
P027F 2021 Honda CR-V — Cold Start Air Fuel Ratio Control System Command Rich

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.

Frequently Asked Questions about P027F Honda Code

1. What does the OBDII code P027F mean on a Honda?

The code P027F indicates an issue with the Cold Start Air-Fuel Ratio Control System, where the system is commanding a rich fuel mixture during startup.

2. What are the common symptoms of code P027F on a Honda?

Symptoms may include rough idle during cold starts, poor fuel economy, increased exhaust emissions, and difficulty starting the engine.

3. What causes the P027F code on a Honda?

Common causes include a malfunctioning air-fuel ratio sensor, issues with the fuel injectors, a faulty engine control module (ECM), or intake manifold air leaks.

4. Can driving with the P027F code cause damage?

Yes, prolonged driving with this code can lead to engine damage due to improper air-fuel mixture, increased emissions, and potential catalytic converter failure.

5. How is the P027F code diagnosed on a Honda?

Technicians typically use an OBDII scanner to retrieve the code, then check the air-fuel ratio sensor, fuel system components, and related wiring for faults.

6. How can I fix the P027F code on my Honda?

Repairs may include replacing a faulty air-fuel ratio sensor, cleaning or replacing fuel injectors, repairing wiring issues, or reprogramming the ECM.

7. Can a dirty air filter cause the P027F code?

While unlikely, a severely clogged air filter can affect air intake and potentially contribute to cold start issues, though itâ€™s not a primary cause of this code.

8. How much does it cost to repair the P027F code on a Honda?

Repair costs vary based on the specific cause but can range from $150 for sensor replacement to over $500 for more complex issues.

9. Is the P027F code specific to cold weather?

Yes, this code is typically associated with cold starts, as the system adjusts the air-fuel ratio for optimal performance in lower temperatures.

10. Can a bad thermostat trigger the P027F code on a Honda?

A malfunctioning thermostat can indirectly contribute to this code by affecting engine temperature and cold start conditions, but itâ€™s not a primary cause.