P0051 Code- HO2S Heater Control Circuit Low Bank 2 Sensor 1

What Does Code P0051 Mean

This code is set when the car’s computer, or Engine Control Module (ECM), detects low system voltage in the heater control circuit. Specifically, the code is referencing Bank 2 Sensor 1. The heater circuit in the heated oxygen sensor is for warming the sensor before the vehicle reaches operating temperature for an accurate reading. This code may be seen with P0052.

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codigo P0051	codigo falla P0051	P0051 kody błędów	codigo de falla P0051

Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

Possible causes

• Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
• Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted
• Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
• Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 fuse
• Faulty Engine Control Module (ECM)

What repairs can fix the P0051 code?

• Replacing bank 2 sensor 1
• Fixing the connection issues and reattaching the connectors
• Repairing any open or shorted wiring
• Replacing the heater circuit fuse
• Replacing the ECM

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