AutoCodes – Mazda – P0021 Mazda

P0021 Mazda Code - CMP Timing Over Advanced Left side

Quick Answer

P0021 Mazda indicates CMP Timing Over Advanced Left side. Common causes include Variable camshaft timing actuator stuck in advance position, Timing belt jumped. 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: P0021 Mazda indicates CMP Timing Over Advanced Left side.
Common causes: Common causes include Variable camshaft timing actuator stuck in advance position, Timing belt jumped.
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 9,699

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
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Code P0021 Mazda Description

OBDII Code P0021 Mazda - CMP Timing Over Advanced Left side - AutoCodes.com — P0021 Mazda Code - CMP Timing Over Advanced Left side

What does this mean?

What are the Possible Causes of the DTC P0021 Mazda?

Variable camshaft timing actuator stuck in advance position
Timing belt jumped

How to Fix the DTC P0021 Mazda?

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 P0021 Mazda 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 P0021 Mazda code?

Need more information on how to fix the P0021 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0021 Mazda code diagnosed by a professional: Find a repair shop in your area

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 P0021 Mazda Code

1. What are the common symptoms of OBDII code P0021 in a Mazda, indicating CMP Timing Over Advanced Left side?

- Common symptoms include rough idling, decreased engine performance, engine misfires, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code P0021 in a Mazda?

- The code P0021 in a Mazda is typically caused by a faulty camshaft position sensor, a faulty variable valve timing (VVT) solenoid, or issues with the timing chain.

3. How can I diagnose the cause of OBDII code P0021 in my Mazda?

- To diagnose OBDII code P0021, you can start by checking the camshaft position sensor and VVT solenoid for proper operation. You may also need to inspect the timing chain for any issues.

4. Can driving with OBDII code P0021 in a Mazda cause further damage?

- Continuing to drive with OBDII code P0021 in a Mazda can potentially cause damage to the engine over time due to incorrect timing, so it is recommended to address the issue promptly.

5. What are some repair tips for fixing OBDII code P0021 in a Mazda?

- Repairing OBDII code P0021 in a Mazda may involve replacing the camshaft position sensor, VVT solenoid, or repairing/replacing the timing chain. It's advisable to follow the manufacturer's repair procedures.

6. Will resetting the Check Engine light resolve OBDII code P0021 in a Mazda?

- Simply resetting the Check Engine light will not fix the underlying issue causing OBDII code P0021 in a Mazda. Proper diagnosis and repair of the root cause is necessary.

7. Can a DIY enthusiast fix OBDII code P0021 in a Mazda?

- Depending on the DIY enthusiast's skill level and access to tools, they may be able to address OBDII code P0021 in a Mazda by replacing the camshaft position sensor or VVT solenoid. However, more complex repairs involving the timing chain may require professional assistance.

8. How much does it typically cost to repair OBDII code P0021 in a Mazda?

- The cost of repairing OBDII code P0021 in a Mazda can vary depending on the specific cause of the issue and labor rates in your area. It's advisable to obtain quotes from trusted mechanics or repair shops.

9. Is it safe to drive my Mazda with OBDII code P0021 if the symptoms are not severe?

- While driving with OBDII code P0021 in a Mazda may be possible if symptoms are mild, it is recommended to address the issue as soon as possible to prevent potential engine damage.

10. How often does OBDII code P0021 occur in Mazda vehicles?

- OBDII code P0021, indicating CMP Timing Over Advanced Left side, can occur in Mazda vehicles with variable valve timing systems, particularly in models equipped with VVT technology. Regular maintenance and prompt repairs can help prevent this code from reoccurring.