P0038 GMC Code - HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The P0038 GMC diagnostic trouble code (DTC) refers to a malfunction in the HO2S (Heated Oxygen Sensor) heater control circuit for Bank 1 Sensor 2. Common causes include Faulty HO2S sensor, Damaged wiring or connectors in the heater circuit, Blown fuse related to the sensor. 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
- P0038 GMC indicates HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty HO2S sensor, Damaged wiring or connectors in the heater circuit, Blown fuse related to the sensor.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0038 GMC Description
The P0038 GMC diagnostic trouble code (DTC) refers to a malfunction in the HO2S (Heated Oxygen Sensor) heater control circuit for Bank 1 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater control circuit ensures that the sensor reaches operating temperature quickly for accurate readings.
Common Causes of P0038 GMC
- Faulty HO2S sensor.
- Damaged wiring or connectors in the heater circuit.
- Blown fuse related to the sensor.
- Malfunctioning ECM.
- Corrosion or contamination in the sensor connections.
Symptoms of P0038 GMC
- Check engine light illuminated on the dashboard.
- Decreased fuel efficiency.
- Rough idling or stalling.
- Failed emissions test.
- Poor engine performance.
How to Fix P0038 GMC
- Use an OBD-II scanner to confirm the P0038 code and identify the specific sensor location.
- Inspect the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
- Check the fuse related to the HO2S heater circuit and replace if blown.
- Test the HO2S sensor using a multimeter to determine if it is functioning correctly. Replace if faulty.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0038 GMC
The cost of repairing a P0038 GMC code can vary depending on the specific cause of the issue. On average, replacing a faulty HO2S sensor can range from $100 to $200, while addressing wiring or connector issues may cost between $50 to $150. If the ECM needs to be replaced, the cost can be significantly higher, potentially exceeding $500. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total repair cost can add up quickly. It's advisable to consult with a trusted mechanic to get an accurate estimate based on your vehicle's make and model.
Tech Notes for P0038 GMC
Need more information about the P0038 GMC code?
Need more information on how to fix the P0038 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0038 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P0038 2014 GMC Sierra — HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
- P0038 2015 GMC Sierra — HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
- P0038 2016 GMC Sierra — HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
- P0038 2017 GMC Sierra — HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
- P0038 2018 GMC Sierra — HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
Frequently Asked Questions about P0038 GMC Code
What does the OBDII code P0038 mean on a GMC?
P0038 indicates a high voltage issue in the heater control circuit for the oxygen sensor (HO2S) located on Bank 1, Sensor 2.
What are the common symptoms of P0038 in a GMC?
Symptoms may include an illuminated check engine light, decreased fuel efficiency, and difficulty passing emissions tests.
What causes the P0038 code on a GMC vehicle?
Common causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a malfunctioning powertrain control module (PCM).
Can I drive my GMC with a P0038 code?
While the vehicle may still be drivable, ignoring this code can lead to reduced fuel efficiency and possible damage to the catalytic converter over time.
How do I fix the P0038 code on my GMC?
Repairs may include replacing the oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses, or updating/replacing the PCM if necessary.
How can I test the oxygen sensor heater circuit for P0038?
Use a multimeter to check for proper voltage and resistance in the heater circuit wiring and across the oxygen sensor's heater element.
Does P0038 always mean the oxygen sensor needs replacing?
No, the issue could also stem from wiring problems, a faulty fuse, or ECM/PCM issues, so proper diagnosis is essential.
Where is Bank 1, Sensor 2 located on a GMC?
Bank 1 refers to the side of the engine with cylinder 1, and Sensor 2 is located downstream of the catalytic converter on that side.
What tools are needed to diagnose and fix P0038?
You’ll need an OBDII scanner, a multimeter, and possibly basic hand tools like wrenches and screwdrivers for sensor replacement or wiring repair.
How much does it cost to repair a P0038 code on a GMC?
The cost varies but typically ranges from $150 to $300 if replacing the oxygen sensor. Wiring repairs or PCM issues may cost more, depending on the extent of the damage.
Discuss the causes and fixes for P0038 GMC OBDII Code
Code P0038 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.