AutoCodes – Cadillac – P0147 Cadillac

P0147 Cadillac Code - HO2S Heater Circuit Bank 1 Sensor 3

Quick Answer

When the ignition is turned on, the battery voltage is supplied to HO2S 3 heater to provide for faster sensor warm-up, thus allowing the sensor to become active in a shorter period of time. Common causes include Faulty HO2S Heater Circuit Bank 1 Sensor 3, HO2S Heater Circuit Bank 1 Sensor 3 harness is open or shorted, HO2S Heater Circuit Bank 1 Sensor 3 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: P0147 Cadillac indicates HO2S Heater Circuit Bank 1 Sensor 3.
Common causes: Common causes include Faulty HO2S Heater Circuit Bank 1 Sensor 3, HO2S Heater Circuit Bank 1 Sensor 3 harness is open or shorted, HO2S Heater Circuit Bank 1 Sensor 3 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 1,291

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 15, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0147 Cadillac Description

When the ignition is turned on, the battery voltage is supplied to HO2S 3 heater to provide for faster sensor warm-up, thus allowing the sensor to become active in a shorter period of time. Powertrain Control Module (PCM) reads the amount of time necessary for the sensor to become active after start-up. If PCM determines too much time was required for HO2S 3 to become active, the Diagnostic Trouble Code (DTC) P0147 will set.

OBDII Code P0147 Cadillac - HO2S Heater Circuit Bank 1 Sensor 3 - AutoCodes.com — P0147 Cadillac Code - HO2S Heater Circuit Bank 1 Sensor 3

What does this mean?

What are the Possible Causes of the DTC P0147 Cadillac?

Faulty HO2S Heater Circuit Bank 1 Sensor 3
HO2S Heater Circuit Bank 1 Sensor 3 harness is open or shorted
HO2S Heater Circuit Bank 1 Sensor 3 circuit poor electrical connection

How to Fix the DTC P0147 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0147 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 P0147 Cadillac Code

1. What does the OBDII code P0147 mean on a Cadillac?

P0147 indicates a problem with the Heater Circuit of the Heated Oxygen Sensor (HO2S) on Bank 1, Sensor 3. The heater is not functioning properly, which affects the sensor's performance.

2. What are the symptoms of a P0147 code on a Cadillac?

Symptoms may include an illuminated Check Engine Light, decreased fuel efficiency, higher emissions, and possible engine performance issues like rough idling.

3. What causes the P0147 code on a Cadillac?

Common causes include a blown fuse, damaged wiring or connectors, a faulty oxygen sensor, or a malfunctioning powertrain control module (PCM).

4. Which sensor does Bank 1 Sensor 3 refer to?

Bank 1 Sensor 3 refers to the downstream oxygen sensor located after the catalytic converter on the side of the engine with cylinder 1.

5. Can a bad oxygen sensor heater cause code P0147?

Yes, a failed oxygen sensor heater is a primary cause of the P0147 code, as it prevents the sensor from reaching operating temperature quickly.

6. How can I diagnose the P0147 code on a Cadillac?

Start by checking the oxygen sensor's wiring and connectors for damage or corrosion, test the sensor's resistance, and verify power and ground supply to the sensor.

7. Can I drive my Cadillac with a P0147 code?

While the car may still be drivable, prolonged driving with this code can increase emissions and potentially damage the catalytic converter over time.

8. How do I repair a P0147 code on my Cadillac?

Repairs may include replacing the faulty oxygen sensor, repairing or replacing damaged wiring, checking and replacing a blown fuse, or reprogramming the PCM if necessary.

9. How much does it cost to fix a P0147 code on a Cadillac?

The cost varies but typically ranges from $150 to $400 for parts and labor, depending on whether only the sensor needs replacement or additional wiring repairs are required.

10. How can I prevent the P0147 code from recurring?

Regular maintenance, inspecting the O2 sensor wiring for damage, and addressing exhaust system issues promptly can help prevent the P0147 code from reappearing.