Powertrain, generic (extended)

P2580 Turbocharger/Supercharger Speed Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2580 says the signal from turbocharger or supercharger speed sensor A stays at the low end, so the engine computer sees too little or no usable pulse activity - typically from a short to ground, a weak sensor or a pickup that cannot read the target. A Stellantis STAR case from November 2023 for 2022-2024 Ram 2500 to 5500 trucks reports P2580 with the warning lamp, sometimes after few miles; besides the normal circuit tests it asks the technician to pull the sensor and inspect bore and tone wheel with a borescope, since debris or an extra O-ring left in the bore spoiled the signal. P2581 is the high-side counterpart, P2579 an implausible speed with a working circuit. Boost is often reduced.

Likely causes

Debris on the tone wheel or an extra O-ring in the sensor bore
Signal wire shorted to ground
Speed sensor A with weak or missing output

Symptoms

  • Malfunction indicator lamp on
  • Turbo speed reads zero or very low in live data
  • Possible boost limitation and reduced power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

turbo speed sensor asensor wiring

Related codes

P2578P2579P2581P2582P2595

References: static.nhtsa.gov, law.cornell.edu.