April 10, 2026

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What does code P2106 mean?

A P2106 trouble code means the throttle actuator control system has forced the engine into limited power mode. This is a protective action taken by the PCM when it detects a problem that could affect safe operation.

Instead of shutting the engine off completely, the system reduces throttle response and limits engine performance to prevent damage.

This is commonly referred to as limp mode or reduced power mode.

👉 Need help understanding PCM failures? Start here: What Does an ECM Do in a Car?

Common symptoms of a P2106 code

• Reduced engine power
• Limited acceleration
• Vehicle stuck in limp mode
• Check engine light on
• Slow throttle response
• Vehicle may not exceed certain speeds
• Hesitation during driving

What can cause a P2106 code?

• Faulty throttle body
• Throttle actuator motor issues
• Accelerator pedal position sensor problems
• Wiring or connector faults
• Air intake or airflow sensor issues
• Other related trouble codes present
• PCM detecting a system fault

This code is often triggered as a response to another problem, not always the root cause.

Is P2106 serious?

Yes — while the vehicle may still run, reduced power can make driving difficult and unsafe, especially on highways or in traffic.

The system is limiting performance to protect the engine and prevent further damage.

How is P2106 diagnosed?

• Scan for all stored trouble codes
• Identify any related or primary codes
• Inspect throttle body and intake system
• Check wiring and connections
• Test throttle actuator and sensors
• Verify PCM signals and outputs

Since this is often a response code, finding the main issue is critical.

Still dealing with a P2106 code? Start your repair here

How do you fix a P2106 code?

• Diagnose and repair underlying codes first
• Clean or replace the throttle body
• Repair wiring or electrical faults
• Replace faulty sensors
• Perform throttle relearn procedures
• Test and repair PCM-related issues if necessary

Fixing the root cause will typically resolve the P2106 code.

Can a bad PCM cause a P2106 code?

Yes, in some cases. The PCM is responsible for controlling throttle behavior and limiting power when necessary. If it malfunctions or receives incorrect data, it may trigger this code or fail to manage throttle performance properly.

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• Dealership Replacement: $1,000 – $2,500+
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👉 Read more PCM symptoms and warning signs

🧠 Final Thoughts

The P2106 code indicates your vehicle is in reduced power mode to protect itself from a detected issue. While the car may still run, performance is limited and the underlying problem should be addressed as soon as possible.

👉 Proper diagnosis will help identify the root cause and restore full engine performance safely.

🔗 Related Trouble Codes You Should Check

If you're diagnosing a P2112 code, you may also want to check:

👉 P2101 Code  
👉 P2116 Code  
👉 P0607 Code

🔗 Related PCM & ECM Guides

👉 7 Symptoms of a Bad PCM
👉 PCM Repair vs Replacement
👉 Start Your PCM Repair Here