Error code

OBD2 P2255

OBD2P2255
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Negative Current Control Circuit Low.

Severity

moderateCan be driven, but may cause increased emissions and reduced fuel efficiency.

Summary

Code P2255 indicates an abnormally low voltage in the negative current control circuit of the heated oxygen sensor (HO2S) #1 on bank 2 of V-type engines, which is located upstream of the catalytic converter.

Common Causes

  • Damaged or shorted wiring between the HO2S and PCM
  • Corroded electrical connectors in the circuit
  • Defective oxygen sensor
  • Exhaust leaks upstream of the catalytic converter

Diagnosis

  1. Inspect wiring and connectors between HO2S #1 on bank 2 and the PCM for damage or corrosion.
  2. Check for exhaust leaks upstream of the catalytic converter.
  3. Test the oxygen sensor for functionality.

Fixes

  • Repair damaged wiring or replace faulty electrical connectors in the circuit.
  • Replace a defective oxygen sensor if necessary.

FAQ

What does P2255 mean?

P2255 indicates an issue with the negative current control circuit of the heated oxygen sensor (HO2S) #1 on bank 2, which is upstream of the catalytic converter.

How serious is code P2255?

Code P2255 is moderately serious. It can cause increased emissions and reduced fuel efficiency but does not typically prevent driving.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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