• Check Engine Light illuminated
• Poor throttle response
• Engine may go into 'limp' mode
• Faulty throttle/pedal position sensor
• Wiring issues between the sensor and ECM
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• P2135
• P2138
Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation
This code means that the computer in your car is getting confusing signals from the gas pedal. It's like when you press a button on a remote and it doesn't do what you expect.
The P2139 code is triggered when the Engine Control Module (ECM) detects a voltage correlation error between throttle/pedal position sensor/switch D and F.
The throttle/pedal position sensors are responsible for sending the position of the throttle or pedal to the ECM. If the ECM detects that the voltage signals from these sensors do not correlate as expected, it triggers the P2139 code. This could mean that the sensors are not aligned or there is a fault in the wiring or connectors.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the throttle/pedal position sensors for proper voltage and resistance.
• Replace faulty throttle/pedal position sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdrivers
$150 - $500
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regular maintenance checks
• Ensure connectors are secure
• Avoid water exposure to engine components
Sensor Issue
• Avoid driving at high speeds until the issue is resolved.
• Have a professional mechanic inspect the vehicle.
Check with your vehicle manufacturer as some sensors may be covered under warranty.
This code has been more prevalent in vehicles with electronic throttle control systems introduced in the early 2000s.
Moderate – While the car may still be drivable, it can lead to unsafe driving conditions if not addressed.
Ignoring this code may lead to reduced vehicle performance and potential safety hazards.
• Engine running
• Use of diagnostic tools
The throttle/pedal position sensor is typically located near the throttle body or on the accelerator pedal assembly.
Q: Can I drive with a P2139 code?
A: It's not recommended to drive for long periods with this code, as it can affect throttle response and safety.
Q: How do I clear a P2139 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
