What Does P1275 Mean?
The accelerator pedal position (APP) sensor 1 circuit has an electrical fault. This manufacturer-specific code indicates the APP sensor 1 signal voltage is outside the expected operating range, which may be caused by a wiring issue, sensor failure, or connector problem. The electronic throttle control system relies on APP sensor 1 as the primary driver demand input, so this fault typically triggers reduced power mode.
Safety Warning
APP sensor 1 is the primary throttle demand input. An electrical fault can cause sudden entry into reduced power mode while driving, which is dangerous in traffic. In severe cases, incorrect pedal position signals could lead to unintended acceleration or loss of throttle response. Diagnose immediately.
Common Causes
30%
Failing APP sensor assembly with degraded sensor 1 resistive element
25%
Corroded or damaged wiring in the APP sensor 1 signal circuit
20%
Poor connector contact at the accelerator pedal module due to corrosion or spread terminals
15%
5V reference supply issue affecting the APP sensor 1 input
10%
ECM internal fault on the APP sensor 1 analog input
Diagnostic Steps
1
Check for related APP and throttle position codes (P1276, P2122, P2123, P2138) to determine if the fault is limited to sensor 1 or affects multiple sensors.
2
Using a scan tool, monitor APP sensor 1 voltage while slowly sweeping the pedal from idle to wide-open throttle. The voltage should increase smoothly and linearly with no jumps, dropouts, or dead spots.
3
Inspect the accelerator pedal module connector for corrosion, moisture, bent pins, or loose terminal fit.
4
Measure the 5V reference and ground voltages at the APP sensor connector — the reference should be 4.9-5.1V and the ground should be less than 0.05V.
5
If voltages and wiring are good but the signal is erratic, replace the accelerator pedal position sensor assembly.
6
After replacement, perform the accelerator pedal position relearn procedure per manufacturer instructions.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The accelerator pedal position (APP) sensor 1 circuit has an electrical fault. This manufacturer-specific code indicates the APP sensor 1 signal voltage is outside the expected operating range, which may be caused by a wiring issue, sensor failure, or connector problem. The electronic throttle contr...
The most common cause of P1275 (Accelerator Pedal Position (APP) Sensor 1 Circuit) is: Failing APP sensor assembly with degraded sensor 1 resistive element
Typical repair costs for P1275 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
APP sensor 1 is the primary throttle demand input. An electrical fault can cause sudden entry into reduced power mode while driving, which is dangerous in traffic. In severe cases, incorrect pedal position signals could lead to unintended acceleration or loss of throttle response. Diagnose immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1275 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
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