What does code P1579 mean?

Q: What does code P1579 mean?

P/N To D/R At High Throttle Angle. P1579 on GM vehicles indicates that the powertrain control module (PCM) has detected an implausible signal from the park/neutral (P/N) to drive/reverse (D/R) switch when the throttle angle is high. The PCM expects the transmission range switch to report a change from Park or Neutral to Drive or Reverse only when the throttle is at a low angle, and a high throttle angle during this transition suggests a faulty switch, wiring issue, or misadjusted linkage.

DTC codes / GM codes / P1579

P1579 · GMP/N To D/R At High Throttle Angle

P1579 on GM vehicles indicates that the powertrain control module (PCM) has detected an implausible signal from the park/neutral (P/N) to drive/reverse (D/R) switch when the throttle angle is high. The PCM expects the transmission range switch to report a change from Park or Neutral to Drive or Reverse only when the throttle is at a low angle, and a high throttle angle during this transition suggests a faulty switch, wiring issue, or misadjusted linkage.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.