AutoCodes – Jeep – P0671 Jeep

P0671 Jeep Code - Cylinder 1 Glow Plug Circuit Fault

Quick Answer

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. Common causes include Faulty Cylinder #1 Glow Plug, Cylinder #1 Glow Plug harness is open or shorted, Cylinder #1 Glow Plug 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: P0671 Jeep indicates Cylinder 1 Glow Plug Circuit Fault.
Common causes: Common causes include Faulty Cylinder #1 Glow Plug, Cylinder #1 Glow Plug harness is open or shorted, Cylinder #1 Glow Plug 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 1,149

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0671 Jeep Description

The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The Engine Control Module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The glow plug system has individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code. The Diagnostic Trouble Code (DTC) will set if the Engine Control Module has detected a fault in the cylinder #1 glow plug circuit.

OBDII Code P0671 Jeep - Cylinder 1 Glow Plug Circuit Fault - AutoCodes.com — P0671 Jeep Code - Cylinder 1 Glow Plug Circuit Fault

What does this mean?

What are the Possible Causes of the DTC P0671 Jeep?

Faulty Cylinder #1 Glow Plug
Cylinder #1 Glow Plug harness is open or shorted
Cylinder #1 Glow Plug circuit poor electrical connection
Faulty Glow Plug Module

How to Fix the DTC P0671 Jeep?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0671 Jeep 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.

Need more information about the P0671 Jeep code?

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Need Help with the Code?

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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 P0671 Jeep Code

What does the OBDII code P0671 mean for my Jeep?

The code P0671 indicates a fault in the glow plug circuit for Cylinder 1, which can lead to issues with starting the engine, especially in cold weather.

What are the common symptoms of a P0671 code?

Common symptoms include difficulty starting the engine, rough idling, and increased exhaust emissions. You may also notice a check engine light illuminated on the dashboard.

What causes the P0671 code to trigger?

The P0671 code can be caused by a faulty glow plug, a wiring issue, a blown fuse, or a malfunctioning glow plug relay for Cylinder 1.

Can I drive my Jeep with a P0671 code?

While you can drive your Jeep, it's not recommended as it may lead to starting problems, reduced performance, and potential damage to the engine over time.

How can I diagnose the P0671 code?

To diagnose the P0671 code, use an OBDII scanner to confirm the code and check the glow plug resistance, inspect the wiring and connectors for damage, and test the glow plug relay.

What repairs are needed to fix the P0671 code?

Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug relay.

How much does it typically cost to repair a P0671 code?

Repair costs can vary widely, but replacing a glow plug typically ranges from $100 to $300, depending on labor rates and parts prices.

Can a bad battery cause a P0671 code?

Yes, a weak or failing battery can lead to insufficient voltage for the glow plug system, potentially triggering a P0671 code.

Is there a way to reset the P0671 code after repairs?

Yes, you can reset the code using an OBDII scanner or by disconnecting the battery for a short period. However, it's important to ensure the underlying issue is resolved first.