What Does P2031 Mean?
The PCM has detected an electrical circuit malfunction with the exhaust gas temperature (EGT) sensor located after the catalytic converter on Bank 1. This sensor monitors exhaust temperature for emission control and engine protection.
Common Causes
40%
EGT sensor failure or internal short/open circuit
30%
Damaged wiring or corroded connector at EGT sensor
15%
Poor sensor ground connection
10%
Exhaust leak near sensor causing erratic readings
5%
PCM internal circuit fault
Diagnostic Steps
1
Step 1: Inspect EGT sensor connector for corrosion, moisture, or terminal damage
2
Step 2: Measure sensor resistance at various temperatures and compare to specifications
3
Step 3: Check continuity and resistance of wiring between sensor and PCM
4
Step 4: Verify sensor ground circuit integrity with DVOM
5
Step 5: Monitor live sensor data during warm-up cycle for proper temperature response
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The PCM has detected an electrical circuit malfunction with the exhaust gas temperature (EGT) sensor located after the catalytic converter on Bank 1. This sensor monitors exhaust temperature for emission control and engine protection.
The most common cause of P2031 (Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2) is: EGT sensor failure or internal short/open circuit
Typical repair costs for P2031 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances but prolonged operation may cause engine damage from overheating or emissions system failure. Repair promptly to prevent catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2031 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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