AutoCodes – Ford – P0351 1999 Ford F150

P0351 1999 Ford F150 Code - Ignition Coil A Primary/Secondary Circuit Malfunction

Quick Answer

The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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: P0351 1999 Ford F150 indicates Ignition Coil A Primary/Secondary Circuit Malfunction .
Common causes: Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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 3,809

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0351 1999 Ford F150 Description

The ignition system on the vehicle uses individual ignition coils for each cylinder. The Engine Control Module (ECM) controls each ignition coil operation. The ECM sends a ON/OFF signal to energize the ignition coil to create a spark at the spark plug when a spark is required at the cylinder.

OBDII Code P0351 1999 Ford F150 - Ignition Coil A Primary/Secondary Circuit Malfunction - AutoCodes.com — P0351 1999 Ford F150 Code - Ignition Coil A Primary/Secondary Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0351 1999 Ford F150?

Faulty Ignition Coil 1
Ignition Coil 1 harness is open or shorted
Ignition Coil 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0351 1999 Ford F150?

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

Each ignition primary circuit is continuously monitored. The test fails when the PCM does not receive a valid IDM pulse signal from the ignition module (integrated in PCM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0351 1999 Ford F150 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.

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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 P0351 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0351 on a 1999 Ford F150?

- Common symptoms include engine misfires, rough idling, decreased fuel efficiency, and illuminated Check Engine Light.

2. What does OBDII code P0351 for a 1999 Ford F150 indicate?

- The code P0351 indicates a malfunction in the primary or secondary circuit of ignition coil A on the vehicle.

3. What are the possible causes of OBDII code P0351 on a 1999 Ford F150?

- Possible causes include a faulty ignition coil, damaged wiring or connectors, corroded connections, or issues with the powertrain control module (PCM).

4. How can I diagnose the issue causing OBDII code P0351 on my 1999 Ford F150?

- You can diagnose the issue by performing a visual inspection of wiring and connectors, testing the ignition coil, checking for corrosion, and using a diagnostic scanner to monitor the circuit performance.

5. Can I still drive my 1999 Ford F150 with OBDII code P0351?

- It is not recommended to drive the vehicle with code P0351 as it can lead to further damage, decreased performance, and potential safety hazards.

6. How do I repair OBDII code P0351 on a 1999 Ford F150?

- Repair involves replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, and clearing the trouble code using a diagnostic scanner.

7. Are there any tips for preventing OBDII code P0351 on a 1999 Ford F150 in the future?

- Regular maintenance, checking and cleaning connections, using high-quality ignition components, and addressing any issues promptly can help prevent the recurrence of this code.

8. Can a DIY enthusiast fix OBDII code P0351 on a 1999 Ford F150?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P0351, but professional assistance is recommended for accurate diagnosis and proper repair.

9. Will resetting the Check Engine Light resolve OBDII code P0351 on a 1999 Ford F150?

- Simply resetting the Check Engine Light will not resolve the underlying issue causing code P0351. The root cause of the problem must be diagnosed and repaired to prevent the code from reoccurring.

10. How serious is OBDII code P0351 on a 1999 Ford F150?

- OBDII code P0351 should be addressed promptly as it can lead to engine performance issues, potential damage to other components, and may result in the vehicle failing emissions tests.