← View Generic P0678 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2014 Nissan SENTRA

P0678: P0678: Engine Control Module (ECM) Output Circuit Malfunction

on 2014 Nissan SENTRA

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

Your Vehicle

2014 Nissan

SENTRA

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Important for 2014 Nissan SENTRA Owners

Before starting repairs, verify which engine your 2014 Nissan SENTRA has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0678 Mean on 2014 Nissan SENTRA?

The Engine Control Module (ECM) output circuit has malfunctioned, preventing the ECM from sending the correct signals to other engine components.

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Symptoms

• Engine misfires
• rough engine idle
• decreased engine performance
• reduced fuel efficiency

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Common Causes

• Faulty ECM output circuit
• damaged or corroded wiring
• faulty engine sensors
• ECM software issue

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How to Fix P0678 on 2014 Nissan SENTRA

1. Check and clean the ECM output circuit wiring and connectors. 2. Replace the faulty ECM output circuit. 3. Check and replace any faulty engine sensors. 4. Update the ECM software if necessary.

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Parts for 2014 Nissan SENTRA

ECM output circuit Shop ↗ wiring harness Shop ↗ connectors Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0678

P0676 Sequential Code

💡 Why These Codes Are Related:

• Similar Issues: Same root cause or component failure
• Related Problems: Often occur together due to system interactions
• Sequential Codes: Progressive failure stages or multiple sensors
• Same System: Components within the same automotive system