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P0051 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 1)

P0051 code definition

HO2S Heater Control Circuit Low (Bank 2 Sensor 1)

What the P0051 code means

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.

What causes the P0051 code?

  • Bank 2 Sensor 1 failure
  • Poor connection or disconnected connector
  • Open or short in the wiring
  • Blown heater circuit fuse
  • ECM failure

What are the symptoms of the P0051 code?

With the P0051 code, a car will still run and drive; in most cases, the illuminated Check Engine Light on the dashboard will be the only noticeable symptom. Poor fuel economy may be noticed, and the vehicle may run roughly.

How does a mechanic diagnose the P0051 code?

  • Uses a professional grade scan tool to check for all codes present (must be used to show live sensor data)

  • Observes and takes note of any freeze frame data that is associated with the code (to be used in test drive)

  • After P0051 is confirmed, clears the code and performs a test drive under the same circumstances shown in the freeze frame data

  • If the P0051 code returns, performs a visual inspection to check the integrity of the wiring and sensor

  • Scans with a tool used to monitor live data from Bank 2 Sensor 1 if the previous step is found to be okay

  • Checks and tests the ECM if the sensor checks out

Common mistakes when diagnosing the P0051 code

Though the sensor itself is generally the cause of P0051, using the proper tools and following the complete diagnostic procedure without skipping any steps is required as to avoid unneeded repairs. Monitoring the sensor data from the scan tool's live data stream is the only way to check for proper operation, and the sensor should not be replaced until it is tested.

How serious is the P0051 code?

P0051 has easily managed symptoms but like any other code, it should be repaired at the earliest convenience. In rare cases where the vehicle runs poorly and the fuel economy goes down, caution is advised when driving to avoid any issues.

What repairs can fix the P0051 code?

P0051 is generally a quick fix with a reasonable cost at any qualified mechanic.

Additional comments for consideration regarding the P0051 code

If a fuse is found to be blown in the heater control circuit, there is always a reason for it; generally a wiring short. The fuse must be replaced after wiring is repaired.

A professional level scan tool is required to precisely and quickly diagnose P0051. The professional scan tool allows us to view live data from the sensor, such as the voltage and resistance. In addition, this shows us changes in the sensor readings as they occur.

Need help with a P0051 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

This article originally appeared on YourMechanic.com as P0051 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 2 Sensor 1).


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P0051 DODGE Code - O2 Sensor 2/1 Heater Circuit Low

Engine-Codes - Dodge - P0051 DODGE

Repair Importance Level: 2/3

Repair Difficulty Level: 2/3  What is this?

What does this mean?

|P0051 DODGE code 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)

|How is the P0051 DODGE code repair?

Start by checking 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's pins.

What does this mean?

|P0051 DODGE code tech notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

|What is the cost to diagnose the P0051 DODGE code

Labor: 1.0

The cost to diagnose the P0051 DODGE code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0051 DODGE code detected?

The P0051 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit

|What are P0051 DODGE code possible symptoms?

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

|What is P0051 DODGE code meaning?

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0051 DODGE - O2 Sensor 2/1 Heater Circuit Low - Engine-Codes.com

|Need more information with the P0051 DODGE code?

Need more information on how to fix the P0051 DODGE code?
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Repair Importance Level:2

 

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