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P2466 — Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 3

Manufacturer-specificPowertrain (engine & transmission)

OBD-II code P2466 indicates a malfunction in the exhaust gas temperature (EGT) sensor circuit for Bank 2 Sensor 3. This sensor monitors exhaust temperature to help the engine control module (PCM) manage emissions and protect the catalytic converter or diesel particulate filter (DPF).

Symptoms

What causes it — most likely first

1. Faulty exhaust gas temperature sensor (Bank 2 Sensor 3)

The sensor itself may have failed due to age, contamination, or internal damage, leading to incorrect or no signal output.

2. Wiring or connector issues (open, short, or corrosion)

Damaged, frayed, or corroded wiring or connectors in the sensor circuit can disrupt signal transmission between the sensor and PCM.

3. Exhaust leaks near the sensor

Leaks in the exhaust system upstream of the sensor can cause inaccurate temperature readings or expose the sensor to extreme conditions.

4. Poor electrical connection at the sensor or PCM

Loose, dirty, or damaged pins in the sensor or PCM connectors can prevent proper signal communication.

5. Excessive soot or contamination on the sensor

Buildup of soot, oil, or other contaminants on the sensor can impair its ability to measure temperature accurately.

6. Faulty PCM (rare)

While uncommon, a malfunctioning PCM could incorrectly interpret sensor signals or fail to provide proper reference voltage. This is a last-resort diagnosis after all other causes are ruled out.

How it's diagnosed

  1. Retrieve and document all stored trouble codes and freeze-frame data using an OBD-II scanner.
  2. Visually inspect the EGT sensor (Bank 2 Sensor 3) and its wiring harness for damage, corrosion, or contamination. Check for exhaust leaks near the sensor.
  3. Test the sensor’s resistance and voltage output using a multimeter, comparing readings to manufacturer specifications. Verify proper reference voltage (typically 5V) and ground at the sensor connector.
  4. Inspect the sensor connector and PCM connector for bent, corroded, or loose pins. Repair or replace as needed.
  5. Check for continuity and resistance in the wiring between the sensor and PCM. Repair any open or short circuits.
  6. If all electrical tests pass, replace the EGT sensor and clear codes to verify the fix. Monitor for code recurrence.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2460 — Particulate Filter Pressure Sensor B CP2461 — Particulate Filter Pressure Sensor B CP2462 — Particulate Filter Pressure Sensor B CP2463 — Particulate Filter Restriction Soot P2464 — Particulate Filter Differential PressuP2465 — Particulate Filter Differential Pressu

Frequently asked

Is the PCM usually the cause of P2466?

No, the PCM is rarely the cause of P2466. The issue is almost always related to the sensor itself, wiring, or exhaust system conditions. PCM replacement should only be considered after all other potential causes have been thoroughly ruled out.

Can I drive with P2466 active?

Driving with P2466 may lead to reduced engine performance, increased emissions, or potential damage to the catalytic converter or DPF. It’s best to diagnose and repair the issue promptly.

Why is Bank 2 Sensor 3 important?

Bank 2 Sensor 3 monitors exhaust temperature to ensure optimal operation of emissions control systems, such as the catalytic converter or DPF. Accurate readings help prevent overheating and maintain compliance with emissions regulations.

How do I locate Bank 2 Sensor 3?

Bank 2 refers to the side of the engine opposite Bank 1 (which contains cylinder 1). Sensor 3 is typically the third EGT sensor in the exhaust stream, often located downstream of the catalytic converter or near the DPF in diesel engines. Consult the vehicle’s service manual for exact location.