P256C – Engine Idle Speed Selector Sensor/Switch Circuit Low

P256C Possible Causes

  • Faulty engine idle speed selector sensor/switch
  • Engine idle speed selector sensor/switch harness is open or shorted
  • Poor electrical connection in engine idle speed selector sensor/switch circuit

How to Fix Code P256C

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P256C Meaning

The Engine Control Module (ECM) monitors the signal from the engine idle speed selector sensor/switch circuit. The ECM sets the OBDII code when the engine idle speed selector sensor/switch signal is outside factory specifications.

P256D – Engine High Idle Speed Mode Selector Sensor/Switch Circuit

P256D Possible Causes

  • Faulty engine idle speed selector sensor/switch
  • Engine idle speed selector sensor/switch harness is open or shorted
  • Poor electrical connection in engine idle speed selector sensor/switch circuit

How to Fix Code P256D

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P256D Meaning

The Engine Control Module (ECM) monitors the signal from the engine idle speed selector sensor/switch circuit. The ECM sets the OBDII code when the engine idle speed selector sensor/switch signal is outside factory specifications.

P256E – Intermittent / Irregular Engine Idle Speed Control Selector Sensor / Switch Circuit

P256E Possible Causes

  • Faulty engine idle speed selector sensor/switch
  • Engine idle speed selector sensor/switch harness is open or shorted
  • Poor electrical connection in engine idle speed selector sensor/switch circuit

How to Fix Code P256E

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P256E Meaning

The engine control module (ECM) monitors the signal from the engine idle speed selector sensor/switch circuit. The ECM sets the OBDII code when the engine idle speed selector sensor/switch signal is outside factory specifications.

P256F – Range/Performance of A/C Request Circuit B

P256F Possible Causes

  • Low refrigerant
  • Excessive refrigerant
  • Faulty low pressure sensor
  • Low pressure sensor side harness is open or short-circuited
  • Poor electrical connection in the low pressure sensor circuit

How to Fix P256F Code

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light illuminated (or Service Engine Soon warning light)

P256F Meaning

The Powertrain Control Module (PCM) monitors refrigerant pressure through the Air Conditioning (A/C) pressure sensor. The PCM provides a 5V reference and a low reference to the sensor. Changes in A/C refrigerant pressure cause the sensor’s signal to the PCM to vary. When pressure is high, the signal is high. When pressure is low, the signal is low. The PCM sets the OBDII code when the sensor signal falls outside factory specifications.

P2570 – High Ozone Direct Reduction Catalyst Temperature Sensor Circuit

P2570 Possible Causes

  • Faulty direct ozone reduction catalyst temperature sensor
  • Direct ozone reduction catalyst temperature sensor harness is open or shorted
  • Poor electrical connection in ozone reduction catalyst temperature sensor circuit

How to Fix Code P2570

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2570 Meaning

The engine control module (ECM) monitors the signal circuit of the direct ozone reduction catalyst temperature sensor. The ECM sets the OBDII code if the direct ozone reduction catalyst temperature sensor signal falls outside factory specifications.

P2571 – Intermittent/Erratic Direct Ozone Reduction Catalyst Temperature Sensor Circuit

P2571 Possible Causes

  • Faulty direct ozone reduction catalyst temperature sensor
  • Direct ozone reduction catalyst temperature sensor harness is open or shorted
  • Poor electrical connection in the ozone reduction catalyst temperature sensor circuit

How to Fix Code P2571

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2571 Meaning

The Engine Control Module (ECM) monitors the signal circuit of the direct ozone reduction catalyst temperature sensor. The ECM sets the OBDII code if the direct ozone reduction catalyst temperature sensor signal falls outside factory specifications.

P2572 – Ozone Reduction Catalyst Direct Deterioration Sensor Circuit

P2572 Possible Causes

  • Faulty direct ozone reduction catalyst deterioration sensor
  • Direct ozone reduction catalyst deterioration sensor harness is open or shorted
  • Poor electrical connection in direct ozone reduction catalyst deterioration sensor circuit

How to Fix Code P2572

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P2572 Meaning

The engine control module (ECM) monitors the signal from the direct ozone reduction catalyst deterioration sensor. The ECM sets the OBDII code when the direct ozone reduction catalyst deterioration sensor signal falls outside factory specifications.

P2573 – Range/Performance of the Ozone Reduction Catalyst Direct Deterioration Sensor Circuit

P2573 Possible Causes

  • Faulty direct reduction ozone catalyst deterioration sensor
  • Direct ozone reduction catalyst deterioration sensor harness is open or shorted
  • Poor electrical connection in direct reduction ozone catalyst deterioration sensor circuit

How to Fix Code P2573

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2573 Meaning

The Engine Control Module (ECM) monitors the signal from the direct ozone reduction catalyst deterioration sensor. The ECM sets the OBDII code when the direct reduction ozone catalyst deterioration sensor signal falls outside factory specifications.

P2574 – Low Ozone Reduction Catalyst Deterioration Sensor Circuit

P2574 Possible Causes

  • Faulty ozone reduction catalyst deterioration sensor
  • Open or short circuit in ozone reduction catalyst deterioration sensor harness
  • Poor electrical connection in ozone reduction catalyst deterioration sensor circuit

How to Fix Code P2574

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2574 Meaning

The Engine Control Module (ECM) monitors the signal from the ozone reduction catalyst deterioration sensor. The ECM sets the OBDII code when the ozone reduction catalyst deterioration sensor signal falls outside factory specifications.

P2575 – High Ozone Direct Reduction Catalyst Deterioration Sensor Circuit

P2575 Possible Causes

  • Faulty direct reduction ozone catalyst deterioration sensor
  • Direct reduction ozone catalyst deterioration sensor harness open or shorted
  • Poor electrical connection in direct reduction ozone catalyst deterioration sensor circuit

How to Fix Code P2575

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P2575 Meaning

The engine control module (ECM) monitors the signal from the direct reduction ozone catalyst deterioration sensor. The ECM sets the OBDII code when the direct reduction ozone catalyst deterioration sensor signal falls outside factory specifications.