What Does P1545 Mean?
The electronic throttle control system has detected a malfunction in the throttle position control circuit or actuator. The throttle plate may not be responding correctly to PCM commands, affecting engine power and drivability.
Safety Warning
Vehicle may enter limp mode with reduced power or experience unintended acceleration/deceleration. Unsafe driving conditions possible.
Common Causes
40%
Failed throttle body actuator motor or position sensor
25%
Wiring harness damage or connector corrosion at throttle body
20%
Carbon buildup causing throttle plate binding
10%
PCM software issue or internal PCM fault
5%
Poor ground connection to throttle body
Diagnostic Steps
1
Step 1: Visually inspect throttle body for carbon buildup and clean if necessary
2
Step 2: Check throttle body connector for corrosion, damage, and proper seating
3
Step 3: Use scan tool to command throttle actuator through full range and observe response
4
Step 4: Test throttle position sensor voltages at idle and full throttle
5
Step 5: Check wiring harness continuity and resistance between PCM and throttle body
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The electronic throttle control system has detected a malfunction in the throttle position control circuit or actuator. The throttle plate may not be responding correctly to PCM commands, affecting engine power and drivability.
The most common cause of P1545 (Throttle Position Control Malfunction) is: Failed throttle body actuator motor or position sensor
Typical repair costs for P1545 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter limp mode with reduced power or experience unintended acceleration/deceleration. Unsafe driving conditions possible.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1545 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Manufacturer
Recommended Tools
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