P1391 Ford Code - Glow Plug Circuit Low Input Bank 1
Quick Answer
The glow plug system is monitored when the glow plugs are commanded on for more than 35 seconds and battery voltage is between 11.5-14 volts. Common causes include Faulty glow plug relay, Faulty glow plug shunt, Faulty glow plugs. 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
- P1391 Ford indicates Glow Plug Circuit Low Input Bank 1.
- Common causes
- Common causes include Faulty glow plug relay, Faulty glow plug shunt, Faulty glow plugs.
- 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.
Code P1391 Ford Description
What are the Possible Causes of the DTC P1391 Ford?
- Faulty glow plug relay
- Faulty glow plug shunt
- Faulty glow plugs
- Glow plugs harness is open or shorted
- Glow plugs circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1391 Ford?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1391 Ford 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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Frequently Asked Questions about P1391 Ford Code
1. What are the common symptoms of OBDII code P1391 Ford related to the Glow Plug Circuit Low Input Bank 1?
- Common symptoms may include rough idling, difficulty starting the engine, reduced fuel efficiency, and an illuminated check engine light.
2. What are the possible causes of OBDII code P1391 Ford indicating a Glow Plug Circuit Low Input Bank 1 issue?
- Possible causes include faulty glow plugs, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or a problem with the engine control unit (ECU).
3. How can I diagnose the underlying issue causing OBDII code P1391 Ford to appear for the Glow Plug Circuit Low Input Bank 1?
- A thorough diagnostic process may involve checking the glow plugs for continuity, inspecting the wiring for any signs of damage, testing the glow plug control module, and scanning the ECU for any related error codes.
4. Is it safe to continue driving with OBDII code P1391 Ford triggered by a Glow Plug Circuit Low Input Bank 1 problem?
- It is not recommended to drive the vehicle for an extended period with this issue, as it can affect the engine's performance and potentially lead to more severe problems if left unresolved.
5. How can I repair OBDII code P1391 Ford associated with a Glow Plug Circuit Low Input Bank 1 issue?
- Repair options may involve replacing faulty glow plugs, repairing or replacing damaged wiring, addressing issues with the glow plug control module, or reprogramming the ECU as necessary.
6. Can extreme weather conditions affect the Glow Plug Circuit Low Input Bank 1 issue triggering OBDII code P1391 Ford in a Ford vehicle?
- Yes, extreme cold weather can put additional strain on the glow plug system, potentially exacerbating existing issues and leading to the illumination of the check engine light.
7. Are there any preventive measures to avoid encountering OBDII code P1391 Ford due to Glow Plug Circuit Low Input Bank 1 problems?
- Regular maintenance of the glow plug system, including checking and replacing glow plugs as needed, can help prevent issues that may trigger this error code.
8. Can a DIY enthusiast with basic automotive knowledge troubleshoot and fix OBDII code P1391 Ford related to the Glow Plug Circuit Low Input Bank 1?
- While some troubleshooting steps can be performed by individuals with basic automotive knowledge, diagnosing and repairing complex glow plug system issues may require professional assistance.
9. Will resetting the check engine light erase OBDII code P1391 Ford linked to the Glow Plug Circuit Low Input Bank 1?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.
10. How long does it typically take to resolve OBDII code P1391 Ford associated with a Glow Plug Circuit Low Input Bank 1 issue?
- The time needed to resolve this code can vary depending on the specific cause of the problem, the availability of parts, and the expertise of the technician, but it is advisable to address the issue promptly to prevent further damage.
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