P1031 — HO2S Heater Current Monitor Control Circuit Sensors 1

What Does P1031 Mean?

P1031 is a manufacturer-specific diagnostic trouble code: HO2S Heater Current Monitor Control Circuit Sensors 1. This code applies to BUICK, CADILLAC, CHEVY, CHRYSLER, GM vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1031

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic HO2S Heater Current Monitor readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in HO2S Heater Current Monitor circuit (damaged, chafed, or corroded)
🔍 Faulty HO2S Heater Current Monitor connector or terminal
🔍 Failed HO2S Heater Current Monitor
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1031 mean?

P1031 indicates: HO2S Heater Current Monitor Control Circuit Sensors 1. The vehicle's computer has detected that the HO2S Heater Current Monitor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1031?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1031 for extended periods may cause additional problems.

How much does it cost to fix P1031?

Repair costs for P1031 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair HO2S Heater Current Monitor wiring and connectors
🔧 Replace faulty HO2S Heater Current Monitor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1031: HO2S Heater Current Monitor Control Circuit Sensors 1