Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble understanding the signals from the gas pedal. It's like when you try to press a button on a game controller, but the game doesn't respond because it can't read the button press correctly.
The engine control module (ECM) detects a discrepancy between the signals from the two pedal position sensors, PDS1 and PDS2, which are responsible for monitoring the position of the accelerator pedal.
The P1258 code is triggered when the ECM detects that the signals from the two pedal position sensors (PDS1 and PDS2) do not correlate as expected. These sensors provide input on the position of the accelerator pedal to the ECM, which uses this data to control engine power output. A mismatch in these signals can lead to incorrect throttle response.
• Check Engine Light is on
• Poor throttle response
• Vehicle may enter 'limp mode'
• Faulty pedal position sensor
• Wiring issues or poor connections
• Faulty ECM
ECM: Engine Control Module, the computer that manages engine functions.
PDS: Pedal Position Sensor, a component that monitors the position of the accelerator pedal.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the pedal position sensors.
• Test the pedal position sensors for proper operation.
• Replace faulty pedal position sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdrivers
$150 - $500
Moderate
• Chevrolet Malibu
• GMC Sierra
• Buick LaCrosse
• Regularly inspect and maintain vehicle wiring.
• Ensure pedal sensors are clean and free of debris.
• Schedule regular vehicle diagnostics.
Sensor Issue
• Avoid driving the vehicle until the issue is resolved.
• Consult a professional mechanic for accurate diagnosis.
Check with your vehicle manufacturer for warranty coverage on sensor-related issues.
This code has been commonly reported in vehicles with electronic throttle control systems, especially in models from the early 2000s.
High – This issue can affect vehicle drivability and safety.
Driving with this code active can lead to reduced engine performance and may pose a safety risk.
• Vehicle at operating temperature
• Vehicle in park or neutral
The pedal position sensors are located on the accelerator pedal assembly.
Q: Can I drive with a P1258 code?
A: It's not recommended as it can affect throttle response and vehicle performance.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code after repairs are completed.
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