P1258 indicates a discrepancy between the accelerator pedal position sensor 1 (PDS1) and sensor 2 (PDS2) signals. The Powertrain Control Module (PCM) detects that the two sensors are not providing correlated readings and flags a fault.
One of the two pedal sensors may have internal failure, causing voltage or resistance values that fall outside the expected correlation range.
Poor electrical connection can produce intermittent or erroneous signals, leading the PCM to see a mismatch.
Physical damage or wear to the accelerator pedal assembly can cause the sensors to move out of sync.
Rarely, an outdated or corrupted PCM map may misinterpret correct sensor data as a fault.
A malfunctioning PCM can incorrectly flag a correlation error, but this is the least common cause.
No. In the overwhelming majority of cases the fault lies with the pedal sensors, their wiring, or the pedal assembly. PCM replacement is a last‑resort diagnosis after all other possibilities have been eliminated.
Yes, many vehicles reduce engine output to protect the drivetrain when a pedal correlation fault is detected, which explains the loss of power symptoms.
Driving is possible but not recommended, as throttle response may be unpredictable and the vehicle may enter limp mode unexpectedly.
If diagnostic data shows only one sensor out of spec, replace the faulty sensor. However, because the two sensors work as a pair, many technicians replace both to ensure long‑term reliability.