P2480: Exhaust Gas Temperature Sensor Circuit/Open (Bank 1 Sensor 5)

P2480 is the general circuit or open-circuit fault of a fifth exhaust temperature probe on bank 1. Five probes in one line are rare; GM's small diesels with oxidation catalyst, SCR, second catalyst and filter are among the few layouts that use them. GM does not report P2480 there, however: its 2018 tables detect an interrupted probe 5 inside P2482, by a resistance above 1400 Ω with the output energised, and the 2025 tables treat values beyond 100 MΩ the same way. So no maker documents P2480 publicly; CARB only requires that the circuit be monitored. Typical findings would be a broken lead, a corroded plug near the hot exhaust, or a probe whose element has burned through. Low and High faults of the same probe are P2481 and P2482.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

• Warning lamp on
• Missing or frozen value for probe 5 in live data
• Filter regeneration may be suppressed

Most likely causes

• Broken or chafed lead to probe 5
• Corroded or loose connector near the exhaust
• Measuring element of the probe burned through

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the soot load and differential pressure with a scanner
2. Check the continuity of the wire between the component and the control module.
3. Check the differential pressure sensor's hoses
4. Check the temperatures before and after the filter
5. Fix any fuel injection or EGR codes before regenerating
6. Perform a regeneration while driving or at a repair shop when the diagnosis allows it

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2480 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 4: Emissions
• 80: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2480?

If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.

What causes code P2480?

The most common causes are: broken or chafed lead to probe 5; corroded or loose connector near the exhaust; measuring element of the probe burned through.

Related codes

• P2481Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 5)
• P2482Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 5)
• P2483Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 5)
• P2484Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 5)
• P2485Exhaust Gas Temperature Sensor Circuit/Open (Bank 2 Sensor 5)

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
• gsi.ext.gm.com: 25OBDG04A

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.