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P0059 Cadillac Code - HO2S Heater Resistance Bank 2 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0059 Cadillac indicates HO2S Heater Resistance Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,027

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0059 Cadillac Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects the HO2S heater is not within a specified resistance range at engine start-up.

OBDII Code P0059 Cadillac - HO2S Heater Resistance Bank 2 Sensor 1 - AutoCodes.com — P0059 Cadillac Code - HO2S Heater Resistance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0059 Cadillac?

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

How to Fix the DTC P0059 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0059 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0059 Cadillac Code

1. What are common symptoms of OBDII code P0059 in a Cadillac?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

2. What does the OBDII code P0059 on a Cadillac indicate?

- This code specifically refers to an issue with the heater resistance in Bank 2 Sensor 1 of the HO2S (Heated Oxygen Sensor).

3. What are possible causes of OBDII code P0059 in a Cadillac?

- Potential causes include a faulty HO2S heater, damaged wiring or connectors, a blown fuse, or issues with the engine control module.

4. How can I diagnose the root cause of OBDII code P0059 in my Cadillac?

- A thorough diagnosis typically involves checking the HO2S heater circuit for continuity, inspecting wiring for damage, testing the sensor's resistance, and scanning for related trouble codes.

5. Is it safe to continue driving with OBDII code P0059 in my Cadillac?

- It is generally not recommended to drive with this code present, as it can lead to reduced fuel efficiency and potential long-term damage to the engine.

6. Can I repair OBDII code P0059 in my Cadillac myself?

- Depending on your experience and access to tools, you may be able to replace the faulty HO2S heater yourself, but it's advisable to consult a professional for proper diagnosis and repair.

7. How much does it typically cost to fix OBDII code P0059 in a Cadillac?

- The cost of repair can vary based on the specific issue, but it may range from $150 to $400, including parts and labor.

8. Are there any preventive maintenance tips to avoid OBDII code P0059 in a Cadillac?

- Regularly inspecting and maintaining the HO2S, checking wiring integrity, and addressing any engine performance issues promptly can help prevent this code from occurring.

9. Can a bad oxygen sensor cause OBDII code P0059 in a Cadillac?

- Yes, a malfunctioning or failed oxygen sensor, particularly Bank 2 Sensor 1, can trigger the P0059 code due to issues with the heater circuit.

10. How long does it take to fix OBDII code P0059 in a Cadillac?

- Repair time can vary depending on the exact cause and complexity of the issue, but it typically takes 1-2 hours for a professional mechanic to diagnose and replace the faulty component.