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P1277 Ford Code - Cylinder #7 High To Low Side Open

Quick Answer

The P1277 Ford diagnostic trouble code indicates that there is an issue with Cylinder #7 High To Low Side Open. Common causes include Wiring harness issues, Faulty fuel injector, Malfunctioning ECM or PCM. 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
P1277 Ford indicates Cylinder #7 High To Low Side Open.
Common causes
Common causes include Wiring harness issues, Faulty fuel injector, Malfunctioning ECM or PCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1277 Ford Description

The P1277 Ford diagnostic trouble code indicates that there is an issue with Cylinder #7 High To Low Side Open. This means that there is a problem with the fuel injector circuit for cylinder #7, specifically involving the transition from high to low side. In a modern fuel injection system, the injector is controlled by the Engine Control Module (ECM) or Powertrain Control Module (PCM), which opens and closes the injector to deliver the precise amount of fuel required for combustion.

OBDII Code P1277 Ford - Cylinder #7 High To Low Side Open
P1277 Ford Code - Cylinder #7 High To Low Side Open

Common Causes of P1277 Ford

  1. Wiring harness issues
  2. Faulty fuel injector
  3. Malfunctioning ECM or PCM
  4. Problem with the fuel injector driver circuit

Symptoms of P1277 Ford

  1. Rough idling
  2. Engine misfires
  3. Decreased fuel efficiency
  4. Loss of power
  5. Check Engine Light illuminated

How to Fix P1277 Ford

  1. Diagnose the specific cause of the issue using a scan tool to pinpoint the exact problem.
  2. Inspect the wiring harness for any visible damage or loose connections and repair as necessary.
  3. Test the fuel injector for proper operation and replace if faulty.
  4. Check the ECM or PCM for any error codes and reprogram or replace if needed.
  5. Verify that the fuel injector driver circuit is functioning correctly and repair or replace as required.

Cost to Fix P1277 Ford

The cost of repairing a P1277 Ford code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that diagnosis time and labor rates can fluctuate, so it's advisable to get estimates from local auto repair shops to determine the exact cost for your vehicle. Rates at dealerships or in metropolitan areas may be higher, while independent shops often offer more competitive prices.

What does this mean?

Tech Notes for P1277 Ford

Check valve cover wire harness connections first, including under the valve cover.

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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 P1277 Ford Code

1. What does the OBDII code P1277 mean on a Ford vehicle?

P1277 indicates that there is an open circuit issue in the high-to-low side of the injector circuit for cylinder #7, meaning the injector is not operating as intended.

2. What are the common symptoms of code P1277 on a Ford?

Symptoms may include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and an illuminated check engine light.

3. What causes the P1277 code to appear on a Ford?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, or a failed powertrain control module (PCM).

4. Can I drive my Ford with a P1277 code?

Driving with a P1277 code is not recommended as it can lead to poor engine performance, increased emissions, and potential damage to other components over time.

5. How do I diagnose the P1277 code on a Ford?

Start by inspecting the wiring and connectors for cylinder #7's injector for damage or corrosion. Use a multimeter to test for continuity and check the resistance of the injector.

6. How do I fix the P1277 code on a Ford?

Repairs may involve replacing the faulty injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to fix the P1277 code on a Ford?

Repair costs can vary depending on the issue, ranging from $50-$300 for injector or wiring repairs to $500-$1,200 if the PCM needs replacement.

8. Can a dirty fuel injector cause the P1277 code on a Ford?

A dirty injector is unlikely to cause this specific code, as P1277 is related to an electrical circuit fault rather than a mechanical blockage.

9. Will clearing the code fix the P1277 issue on a Ford?

Clearing the code will turn off the check engine light temporarily, but it will return if the underlying issue is not resolved.

10. Can a bad PCM cause the P1277 code on a Ford?

Yes, a failed or malfunctioning PCM can cause the P1277 code if it cannot properly control the injector circuit for cylinder #7.

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