AutoCodes – Toyota – P0305 Toyota

P0305 Toyota Code - Cylinder 5 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Common causes include Intake air leak, Faulty spark plug #5, Faulty ignition coil #5. 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: P0305 Toyota indicates Cylinder 5 Misfire Detected.
Common causes: Common causes include Intake air leak, Faulty spark plug #5, Faulty ignition coil #5.
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 47,615

How popular is this code, among other codes? Medium

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 Dec 26, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0305 Toyota Description

When the engine misfires, high concentrations of Hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the Engine Control Module (ECM) monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0305 Toyota - Cylinder 5 Misfire Detected - AutoCodes.com — P0305 Toyota Code - Cylinder 5 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0305 Toyota?

Intake air leak
Faulty spark plug #5
Faulty ignition coil #5
Clogged or faulty fuel injector #5
Fuel injectors #5 harness is open or shorted
Fuel Injectors #5 circuit poor electrical connection
Ignition coils #5 harness is open or shorted
Ignition coils #5 circuit poor electrical connection
Incorrect Fuel pressure
Faulty Mass Air Flow (MAF) Sensor
Faulty Engine Control Module (ECM)
Faulty Engine Coolant Temperature (ECT) Sensor

How to Fix the DTC P0305 Toyota?

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 does this mean?

Code Tech Notes

The P0305 code means that cylinder #5 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #5. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0305 Toyota 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 P0305 Toyota code?

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Need Help with the Code?

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Information for Specific Toyota Models

P0305 2006 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2007 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2008 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2009 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2010 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2011 Toyota Camry — Cylinder 5 Misfire Detected
P0305 2001 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2002 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2003 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2004 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2005 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2006 Toyota Highlander — Cylinder 5 Misfire Detected
P0305 2007 Toyota Highlander — Cylinder 5 Misfire Detected

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.