P0037 Buick 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 Buick 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.
Code P0037 Buick Description
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.
What are the Possible Causes of the DTC P0037 Buick?
- 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 Buick?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0037 Buick 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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Frequently Asked Questions about P0037 Buick Code
What does the OBDII code P0037 mean for a Buick?
P0037 indicates a problem with the heated oxygen sensor (HO2S) heater control circuit for Bank 1 Sensor 2, specifically showing low voltage.
What are the symptoms of code P0037 in a Buick?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, rough idling, or decreased engine performance.
What causes the P0037 code in a Buick?
Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning powertrain control module (PCM).
Which sensor does Bank 1 Sensor 2 refer to in code P0037?
Bank 1 Sensor 2 refers to the downstream oxygen sensor located after the catalytic converter on the side of the engine with cylinder 1.
Can I drive my Buick with the P0037 code?
While the car may still be drivable, it is not recommended as unresolved issues can lead to poor fuel efficiency, increased emissions, and potential damage to the catalytic converter.
How do I diagnose the P0037 code in my Buick?
Check the oxygen sensor wiring and connectors for damage, test the heater circuit for proper voltage and resistance, and inspect the fuse linked to the sensor's heater circuit.
How do I fix the P0037 code in a Buick?
Repairs may involve replacing the oxygen sensor, repairing or replacing damaged wiring, replacing a blown fuse, or addressing PCM issues if necessary.
How much does it cost to repair the P0037 code on a Buick?
The cost can range from $100 to $300 depending on whether the oxygen sensor or wiring needs replacement and labor costs in your area.
Can a bad oxygen sensor cause the P0037 code?
Yes, a faulty oxygen sensor is one of the most common causes of the P0037 code.
Does clearing the code fix the P0037 issue in a Buick?
Clearing the code will reset the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P0037 Buick OBDII Code
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