why is my Ford F-150 13th Generation (2015-2020) check engine light flashing

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

584 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a flashing check engine light on your 2015-2020 Ford F-150. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components
•Allow the engine to cool before inspecting or working on the engine components

Symptoms

•Check engine light is flashing
•Rough engine idle
•Decreased engine power
•Increased fuel consumption
•Engine misfiring
•Unusual engine noises (e.g., knocking or pinging)

Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to retrieve diagnostic trouble codes (DTCs)
2
Check the engine oil level and condition to ensure proper lubrication
3
Inspect spark plugs for wear or fouling, as these can cause misfires
4
Examine ignition coils for damage or malfunction
5
Inspect the fuel system for pressure and leaks, including fuel injectors
6
Check for vacuum leaks in hoses and intake manifold

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
•Socket set
•Torque wrench
•Multimeter
•Fuel pressure gauge
•Vacuum gauge

Parts Required

•Spark plugs
•Ignition coils
•Fuel filter (if applicable)
•Vacuum hoses (if damaged)

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Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to retrieve diagnostic trouble codes (DTCs)
2
Check the engine oil level and condition to ensure proper lubrication
3
Inspect spark plugs for wear or fouling, as these can cause misfires
4
Examine ignition coils for damage or malfunction
5
Inspect the fuel system for pressure and leaks, including fuel injectors
6
Check for vacuum leaks in hoses and intake manifold

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, vacuum gauge.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent electrical shorts during repairs.

2. Retrieve Diagnostic Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn the ignition to the ON position (without starting the engine).
Retrieve and record any trouble codes for further analysis.

3. Address Misfire Issues

Inspect Spark Plugs:
- Remove spark plugs using a socket wrench.
- Examine each plug for wear, carbon buildup, or damage.
- Replace any defective spark plugs with OEM specifications.
- Torque to manufacturer specifications (typically around 13-15 ft-lbs).
Check Ignition Coils:
- Disconnect the electrical connectors from each ignition coil.
- Use a multimeter to test resistance; compare to specifications in the service manual.
- Replace any faulty ignition coils.

4. Fuel System Inspection

Test Fuel Pressure:
- Connect the fuel pressure gauge to the fuel rail test port.
- Turn the ignition ON (without starting) and record the pressure reading.
- Compare with manufacturer specifications (typically around 50-60 psi).
- If low, check the fuel pump and filter for issues.
Inspect Fuel Injectors:
- Listen for clicking sounds from the injectors while the engine is running.
- If an injector is silent, it may be clogged or faulty; replace as necessary.

5. Check for Vacuum Leaks

Use a vacuum gauge to measure the engine’s vacuum levels.
Inspect all vacuum hoses and connections for cracks or disconnections.
Repair or replace any damaged hoses.