← Back to Search Severity: Medium

P0377

P0377: Ignition System Misfire

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
✅ Yes
Save money
Category
Powertrain
System

📖 What Does P0377 Mean?

A misfire detected in one or more cylinders, affecting combustion efficiency, which can cause decreased engine performance, rough idling, and decreased fuel efficiency.
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Symptoms

  • Rough idling
  • decreased engine performance
  • decreased fuel efficiency
  • engine misfires
  • and decreased power
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Common Causes

  • Faulty spark plugs
  • ignition coils
  • fuel injectors
  • vacuum leaks
  • faulty crankshaft or camshaft position sensors
  • and worn piston rings
Fix Guide
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Possible Solutions

1. Check and replace spark plugs, ignition coils, and fuel injectors. 2. Inspect and repair vacuum leaks. 3. Check and replace crankshaft or camshaft position sensors. 4. Check and replace piston rings if worn.

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Common Questions About P0377

Q

Can I drive with code P0377?

A

You can drive for a short time, but should address code P0377 soon to avoid worsening the problem or failing an emissions test.

Q

How much does it cost to fix P0377?

A

The estimated repair cost for code P0377 is between $100 and $500. This includes parts and labor for most makes and models.

Q

Is this code easy to fix myself?

A

This repair is considered moderate. It may require specialized tools or significant disassembly. Professional help is recommended if you aren't an experienced DIYer.

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Complex codes like P0377 can be tricky. Don't risk it if you're unsure.

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Related Diagnostic Codes

Other codes that may appear with P0377

💡 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