What Does P1254 Mean?
The ECM has detected an abnormally high correlation error between Pedal Demand Sensor 2 (PDS2) and the Learned Pedal Demand Sensor (LPDS). This indicates the two accelerator pedal position signals are not tracking each other within acceptable tolerances at the high end of pedal travel. The vehicle may enter a reduced power or limp-home mode as a safety precaution to prevent unintended acceleration.
Safety Warning
This is a safety-critical code. Pedal position sensor disagreement can cause reduced power mode, unexpected loss of throttle response, or in rare cases unintended acceleration. Do not ignore this code — diagnose and repair promptly.
Common Causes
35%
Worn or failing accelerator pedal position sensor assembly with degraded internal track
25%
Corroded or loose wiring connector at accelerator pedal module
20%
Intermittent open or high resistance in PDS2 signal wire
10%
Floor mat interference restricting full pedal travel mechanically
10%
ECM software calibration issue requiring reflash
Diagnostic Steps
1
Check for additional pedal position codes (P1257, P2122-P2128) to determine if the issue is isolated to PDS2 or affects multiple sensors.
2
Inspect the accelerator pedal assembly for mechanical binding, floor mat interference, or physical damage preventing smooth full-range travel.
3
Disconnect and inspect the accelerator pedal connector for corrosion, spread terminals, or moisture damage.
4
Using a scan tool, monitor PDS1, PDS2, and LPDS live data simultaneously while slowly sweeping the pedal from idle to wide-open throttle — look for signal dropout, sticking, or divergence at high pedal positions.
5
If signals diverge, check the wiring harness from the pedal assembly to the ECM for chafing, high resistance, or intermittent opens.
6
Replace the accelerator pedal position sensor assembly if the sensor signals are out of specification.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The ECM has detected an abnormally high correlation error between Pedal Demand Sensor 2 (PDS2) and the Learned Pedal Demand Sensor (LPDS). This indicates the two accelerator pedal position signals are not tracking each other within acceptable tolerances at the high end of pedal travel. The vehicle m...
The most common cause of P1254 (Pedal Correlation PDS2 and LPDS High) is: Worn or failing accelerator pedal position sensor assembly with degraded internal track
Typical repair costs for P1254 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a safety-critical code. Pedal position sensor disagreement can cause reduced power mode, unexpected loss of throttle response, or in rare cases unintended acceleration. Do not ignore this code — diagnose and repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1254 to identify the root cause.
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