P1194 2017 GMC Sierra Code - O2 Low Reference Circuit High Voltage (NOx Sensor 1)
Quick Answer
The P1194 code on a 2017 GMC Sierra indicates a problem with the O2 low reference circuit high voltage for NOx Sensor 1. Common causes include Faulty NOx sensor, Wiring issues in the O2 low reference circuit, Corrosion or damage to sensor connectors. 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
- P1194 2017 GMC Sierra indicates O2 Low Reference Circuit High Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty NOx sensor, Wiring issues in the O2 low reference circuit, Corrosion or damage to sensor connectors.
- 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.
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 P1194 2017 GMC Sierra Description
The P1194 code on a 2017 GMC Sierra indicates a problem with the O2 low reference circuit high voltage for NOx Sensor 1. This code is related to the vehicle's emissions control system, specifically the NOx sensor that monitors the levels of nitrogen oxides in the exhaust gases. The O2 low reference circuit high voltage means that the voltage signal from the NOx sensor is higher than expected, which can lead to inaccurate readings and affect the vehicle's performance and emissions.
Common Causes of P1194 2017 GMC Sierra
- Faulty NOx sensor
- Wiring issues in the O2 low reference circuit
- Corrosion or damage to sensor connectors
- Engine coolant temperature sensor malfunction
- Exhaust system leaks
Symptoms of P1194 2017 GMC Sierra
- Decreased fuel efficiency
- Poor engine performance
- Rough idling
- Hesitation during acceleration
- Increased emissions
How to Fix P1194 2017 GMC Sierra
- Diagnose the issue by using a scan tool to check for the P1194 code and inspecting the NOx sensor and related wiring.
- Test the NOx sensor's voltage output to determine if it is within the correct range.
- Check for any wiring issues or corrosion in the O2 low reference circuit.
- Replace the NOx sensor if it is faulty and repair any damaged wiring or connectors.
- Clear the code and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1194 2017 GMC Sierra
The cost of repairing the P1194 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a NOx sensor can range from $200 to $500, while repairing wiring or connectors may add to the total cost. The total repair cost, including parts and labor, can range from $300 to $800 or more. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.
Need more information about the P1194 2017 GMC Sierra code?
Need more information on how to fix the P1194 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1194 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1194 2017 GMC Sierra Code
1. What does the OBDII code P1194 mean on a 2017 GMC Sierra?
P1194 refers to "O2 Low Reference Circuit High Voltage" and is associated with NOx Sensor 1, indicating an issue with high voltage in the low reference circuit of the sensor.
2. What are the common symptoms of code P1194 on a 2017 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and possible increased emissions.
3. What causes P1194 on a 2017 GMC Sierra?
The primary causes include a faulty NOx sensor, wiring issues such as an open or short circuit, corroded connectors, or a malfunctioning engine control module (ECM).
4. Can I drive my 2017 GMC Sierra with a P1194 code?
While it may be drivable, it's not recommended as it can lead to poor engine performance, increased emissions, and potential damage to other components if left unaddressed.
5. How is the P1194 code diagnosed on a 2017 GMC Sierra?
A technician will use a scan tool to confirm the code, inspect the NOx sensor and its wiring for damage, and test the circuit voltages to identify the root cause.
6. How do I fix the P1194 code on my 2017 GMC Sierra?
Repairs may involve replacing the NOx sensor, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if it's determined to be faulty.
7. How much does it cost to fix a P1194 code on a 2017 GMC Sierra?
Repair costs vary but typically range from $300 to $800 depending on whether the NOx sensor or other components need replacement.
8. Can a dirty NOx sensor cause the P1194 code?
Yes, a dirty or contaminated NOx sensor can contribute to improper readings and trigger the P1194 code.
9. Is the P1194 code related to the oxygen sensors in the exhaust system?
No, P1194 specifically pertains to the NOx sensor, which measures nitrogen oxide levels, not the oxygen sensors that monitor air-fuel ratios.
10. Will clearing the P1194 code fix the problem on a 2017 GMC Sierra?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P1194 2017 GMC Sierra OBDII Code
Code P1194 2017 GMC Sierra 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.