Error code
OBD2 P2256
OBD2P2256
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
O2 Sensor Negative Current Control Circuit High.
Severity
moderateCan drive but may experience reduced fuel efficiency and increased emissions.
Summary
P2256 indicates an issue with the negative current control circuit of the heated oxygen sensor (HO2S) on bank 2, which is likely due to wiring problems.
Common Causes
- Wiring short to positive
Fixes
- Repair or replace the faulty wiring in the negative current control circuit of the oxygen sensor.
FAQ
What does P2256 mean?
P2256 indicates a problem with the heated oxygen sensor's negative current control circuit on bank 2, usually due to faulty wiring.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P2200NOx Sensor Circuit
- P2201NOx Sensor Circuit Range/Performance
- P2202NOx Sensor Circuit Low Input
- P2203NOx Sensor Circuit High Input
- P2204NOx Sensor Circuit Intermittent Input
- P2205NOx Sensor Heater Control Circuit/Open
- P2206NOx Sensor Heater Control Circuit Low
- P2207NOx Sensor Heater Control Circuit High
- P2208NOx Sensor Heater Sense Circuit
- P2209NOx Sensor Heater Sense Circuit Range/Performance
- P2210NOx Sensor Heater Sense Circuit Low Input
- P2211NOx Sensor Heater Sense Circuit High Input