What Does P1544 Mean?
The throttle actuator potentiometer is reporting a signal voltage that exceeds the maximum acceptable threshold. This indicates a sensor circuit fault, typically a short to voltage or internal sensor failure.
Safety Warning
Vehicle will enter limp mode with limited throttle response and reduced power. Acceleration will be severely limited. Drive carefully to service facility only.
Common Causes
35%
Short to voltage in throttle position sensor signal circuit
30%
Failed throttle position sensor or throttle body assembly
20%
Damaged or pinched wiring harness causing short circuit
10%
Moisture or corrosion in throttle body connector causing cross-circuit short
5%
ECM internal fault on TPS input circuit
Diagnostic Steps
1
Step 1: Measure throttle position sensor voltage at connector with key on, engine off
2
Step 2: Disconnect throttle body connector and check for voltage on signal wire (should be 0V)
3
Step 3: Inspect wiring harness for damage, chafing, or shorts to other circuits
4
Step 4: Check for moisture or corrosion inside connector that could cause cross-circuit shorts
5
Step 5: If wiring is intact and no shorts found, replace throttle body assembly
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The throttle actuator potentiometer is reporting a signal voltage that exceeds the maximum acceptable threshold. This indicates a sensor circuit fault, typically a short to voltage or internal sensor failure.
The most common cause of P1544 (Throttle Actuation Potentiometer Signal too High) is: Short to voltage in throttle position sensor signal circuit
Typical repair costs for P1544 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will enter limp mode with limited throttle response and reduced power. Acceleration will be severely limited. Drive carefully to service facility only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1544 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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