What Does P2106 Mean?
The PCM has limited engine power output through throttle restriction due to detecting a fault that requires reduced performance. This is a protective mode less severe than forced idle or shutdown.
Common Causes
30%
Throttle position sensor signal fault or rationality error
25%
Accelerator pedal position sensor degraded signal or intermittent fault
20%
Engine overheating triggering power limitation for protection
15%
Transmission overheating or fault requesting torque reduction
10%
Mass airflow sensor or manifold pressure sensor fault affecting power calculations
Diagnostic Steps
1
Step 1: Scan all modules for additional DTCs that may be requesting power limitation; document all codes and freeze frame data
2
Step 2: Monitor live data for engine coolant temperature, transmission temperature, and intake air temperature; verify all within normal operating range
3
Step 3: Check throttle position sensor and accelerator pedal position sensor correlation; both should track logically during acceleration
4
Step 4: Inspect for intake air leaks, restricted air filter, or exhaust restrictions that may cause abnormal engine load readings
5
Step 5: Test drive vehicle while monitoring actual throttle opening vs. commanded throttle opening to identify when power limitation activates
Estimated Repair Cost
$100 - $1,000
Parts + labor, varies by vehicle and location
The PCM has limited engine power output through throttle restriction due to detecting a fault that requires reduced performance. This is a protective mode less severe than forced idle or shutdown.
The most common cause of P2106 (Throttle Actuator Control System - Forced Limited Power) is: Throttle position sensor signal fault or rationality error
Typical repair costs for P2106 range from $100 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced power available for acceleration and merging into traffic. Vehicle is drivable but may be unable to maintain highway speeds or climb steep grades safely.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2106 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System / Engine Performance
Difficulty
Type
Generic (SAE)
Recommended Tools
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