AutoCodes – GMC – P0037 2014 GMC Sierra

P0037 2014 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0037 2014 GMC Sierra indicates HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 217

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0037 2014 GMC Sierra 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 a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.

OBDII Code P0037 2014 GMC Sierra - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0037 2014 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0037 2014 GMC Sierra?

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

How to Fix the DTC P0037 2014 GMC Sierra?

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 P0037 2014 GMC Sierra 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 P0037 2014 GMC Sierra Code

1. What does the P0037 code mean on a 2014 GMC Sierra?

The P0037 code indicates a low voltage issue in the HO2S (Heated Oxygen Sensor) Heater Control Circuit for Bank 1 Sensor 2, which is the downstream oxygen sensor on the driver's side.

2. What are the symptoms of a P0037 code on a 2014 GMC Sierra?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, and possible issues with emissions system performance.

3. What causes the P0037 code to appear on a 2014 GMC Sierra?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a failed PCM (Powertrain Control Module).

4. Can I drive my 2014 GMC Sierra with a P0037 code?

While it may be safe to drive for short distances, ignoring the code can lead to increased emissions and reduced fuel efficiency. Itâ€™s best to address the issue promptly.

5. How do I diagnose a P0037 code on a 2014 GMC Sierra?

Start by visually inspecting the wiring and connectors for damage, testing the oxygen sensor heater circuit with a multimeter, and checking for blown fuses.

6. How do I fix the P0037 code on my 2014 GMC Sierra?

Repairs may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, or replacing a blown fuse. If the PCM is at fault, reprogramming or replacement may be required.

7. How much does it cost to fix the P0037 code on a 2014 GMC Sierra?

Repair costs vary, but replacing an oxygen sensor typically ranges from $150 to $300, including parts and labor. Wiring repairs may add to the cost.

8. Does a P0037 code affect emissions testing?

Yes, a P0037 code will likely cause your vehicle to fail an emissions test due to improper operation of the oxygen sensor and heater circuit.

9. Can a bad oxygen sensor cause the P0037 code?

Yes, a faulty downstream oxygen sensor is a common cause of the P0037 code, as it directly affects the heater control circuit.

10. Do I need to clear the code after repairs for a P0037 on my 2014 GMC Sierra?

Yes, after completing repairs, use an OBDII scanner to clear the code and ensure the issue is resolved. If the code persists, further diagnosis may be needed.