why is my Ford F-150 13th Generation (2015-2020) check engine light on but no codes

Ford F-150 13th Generation (2015-2020)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

552 words

Problem Statement

Learn how to diagnose and fix the check engine light issue on Ford F-150 (2015-2020) with no error codes. Step-by-step guide included.

Affected Component

Engine

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems

Symptoms

•Check engine light illuminated
•No error codes retrieved from OBD-II scanner
•Possible rough idle
•Intermittent stalling or hesitation during acceleration
•Poor fuel economy

Diagnostic Steps

1
Check for pending codes using OBD-II scanner
2
Inspect the gas cap for cracks or damage
3
Conduct a visual inspection of engine components, wiring, and connectors
4
Inspect for vacuum leaks using a smoke machine or propane torch
5
Verify that the battery voltage is within the normal range
6
Clear the check engine light with the scanner and monitor the vehicle

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Visual inspection tools
•Smoke machine

Parts Required

•Gas cap
•Vacuum hoses

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check for pending codes using OBD-II scanner
2
Inspect the gas cap for cracks or damage
3
Conduct a visual inspection of engine components, wiring, and connectors
4
Inspect for vacuum leaks using a smoke machine or propane torch
5
Verify that the battery voltage is within the normal range
6
Clear the check engine light with the scanner and monitor the vehicle

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, visual inspection tools, smoke machine (if available).
Safety Warnings: Disconnect the battery before working on electrical systems.

2. Inspect the Gas Cap

Remove the gas cap and visually inspect it for cracks or damage.
Clean the gas cap sealing surface on the fuel filler neck.
Reinstall the gas cap securely and ensure it clicks into place.

3. Perform a Visual Inspection

Open the hood and visually check wiring and connectors for any signs of fraying, corrosion, or loose connections.
Look for any obvious damage to components such as the intake manifold, throttle body, and vacuum hoses.

4. Check for Vacuum Leaks

If available, connect a smoke machine to the intake system and introduce smoke to identify any leaks.
Alternatively, use a propane torch (without igniting) around hoses and connections while observing the engine's RPM for changes.

5. Check Battery Voltage

Using a multimeter, measure the voltage at the battery terminals.
Ensure the voltage is between 12.4 and 12.7 volts; if not, charge or replace the battery as needed.

6. Reset the Check Engine Light

Use the OBD-II scanner to clear any stored codes.
Drive the vehicle for a short distance to monitor if the check engine light reappears.