AutoCodes – Generic – P1443

P1443 Code - Evaporative Emission System Control Valve Low/No Flow

Quick Answer

The Powertrain Control Module (PCM) monitors the fuel tank pressure. Common causes include Loose fuel filler cap, Faulty EVAP Canister Purge Solenoid Valve, EVAP Canister Purge Solenoid Valve harness is open or shorted. 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: P1443 indicates Evaporative Emission System Control Valve Low/No Flow.
Common causes: Common causes include Loose fuel filler cap, Faulty EVAP Canister Purge Solenoid Valve, EVAP Canister Purge Solenoid Valve harness is open or shorted.
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 40,361

How popular is this code, among other codes? Medium

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 Jul 06, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1443 Description

The Powertrain Control Module (PCM) monitors the fuel tank pressure. The Diagnostic Trouble Code (DTC) will set when the PCM detects a fuel tank pressure change greater than minus (-) 7 inches of water in 30 seconds occurred with a purge, fuel vapor, flow at less than 0.02 lb/min (0.15 gm/s).

OBDII Code P1443 - Evaporative Emission System Control Valve Low/No Flow - AutoCodes.com — P1443 Code - Evaporative Emission System Control Valve Low/No Flow

What does this mean?

What are the Possible Causes of the DTC P1443?

Loose fuel filler cap
Faulty EVAP Canister Purge Solenoid Valve
EVAP Canister Purge Solenoid Valve harness is open or shorted
EVAP Canister Purge Solenoid Valve circuit poor electrical connection
Blocked hose between the purge valve and FTP sensor
Faulty EVAP Fuel Tank Pressure (FTP) Sensor

How to Fix the DTC P1443?

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 does this mean?

Code Tech Notes

Check for blockages between the fuel tank, the EVAP Canister Purge Solenoid Valve, and the engine intake manifold. Check for obstructions in the EVAP Canister Purge Solenoid Valve diaphragm and ports.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1443 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 P1443 code?

Need more information on how to fix the P1443 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1443 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1443 Audi — EGR Valve Position Sensor Signal Too Low
P1443 BMW — Leakage Diagnostic Pump Control Circuit Signal High
P1443 Ford — Evaporative Emission System Control Valve Low/No Flow
P1443 Hyundai — EVAP System Tank Cap Missing
P1443 Infiniti — Evaporative Emission Control System Control Valve
P1443 Jaguar — EVAP Canister Purge Control System
P1443 Lexus — Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2
P1443 Lincoln — Evaporative Emission System Control Valve Low/No Flow
P1443 Mazda — Evaporative Emission Control System Large leak detected
P1443 Mercedes-Benz — Evaporative Emission Canister Purge Valve Malfunction
P1443 Mercury — Evaporative Emission System Control Valve Low/No Flow
P1443 MINI — Leakage Diagnostic Pump Control Circuit Signal High
P1443 Mitsubishi — EVAP Purge Control Valve 2 Circuit Malfunction
P1443 Nissan — Evaporative Emission Control System Control Valve
P1443 Saab — Evaporative Emission Canister Purge Valve Malfunction
P1443 Subaru — Evaporative Emission Control System Vent Control Function Problem
P1443 Suzuki — EVAP Purge Control Valve Malfunction- Stuck Open
P1443 Toyota — Secondary Air Injection Vacuum Switching Valve Circuit Malfunction Bank 2
P1443 Volkswagen — EGR Valve Position Sensor Signal Too Low

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 P1443 Code

1. What are common symptoms of OBDII code P1443 (Evaporative Emission System Control Valve Low/No Flow)?

- Common symptoms include the illumination of the check engine light, decreased fuel efficiency, and potential difficulties during the vehicle's emissions test.

2. What are the possible causes of OBDII code P1443?

- The code P1443 can be caused by a faulty evaporative emission control valve, issues with the evaporative emission system hoses, a clogged charcoal canister, or malfunctioning purge or vent solenoids.

3. How can I diagnose OBDII code P1443?

- Diagnosing code P1443 typically involves visually inspecting the hoses and components of the evaporative emission system, checking for any leaks, testing the control valve, and using a scan tool to monitor system readings.

4. What repair tips can help fix OBDII code P1443?

- Repair tips for code P1443 may include replacing the control valve, repairing or replacing damaged hoses, cleaning or replacing the charcoal canister, and ensuring proper functioning of the purge and vent solenoids.

5. Can OBDII code P1443 cause any long-term damage to the vehicle?

- While the code itself may not cause immediate harm to the vehicle, prolonged driving with code P1443 unresolved can lead to decreased fuel efficiency, increased emissions, and potential damage to other components of the evaporative emission system.

6. Is it safe to continue driving with OBDII code P1443 present?

- It is generally not recommended to continue driving with code P1443 present, as it can negatively impact fuel efficiency and emissions. It is advisable to address the issue promptly to prevent further complications.

7. Will resetting the check engine light resolve OBDII code P1443?

- Simply resetting the check engine light without addressing the underlying issue causing code P1443 will not resolve the problem. It is essential to diagnose the root cause and perform necessary repairs to clear the code permanently.

8. How much does it typically cost to repair OBDII code P1443?

- The cost of repairing code P1443 can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts. It is advisable to consult with a professional mechanic for an accurate estimate.

9. Are there any preventative measures to avoid OBDII code P1443 in the future?

- Regular maintenance of the evaporative emission system, including checking hoses for wear and tear, ensuring proper sealing of components, and following the manufacturer's recommended service intervals, can help prevent code P1443 from occurring.