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P2086 — Exhaust Gas Temperature Sensor Circuit Rangeperformance Bank 2 Sensor 2

Manufacturer-specificPowertrain (engine & transmission)

The P2086 code indicates that the powertrain control module (PCM) has detected a range or performance problem with the exhaust gas temperature (EGT) sensor for bank 2, sensor 2. This sensor is typically located after the catalytic converter and monitors exhaust temperature to protect components and verify catalyst efficiency. The code sets when the sensor signal is implausible, stuck, or does not change as expected during operation.

Symptoms

What causes it — most likely first

1. Faulty exhaust gas temperature sensor (bank 2, sensor 2)

The sensor itself may be internally shorted, open, or out of calibration, causing an incorrect signal to the PCM.

2. Wiring or connector issues

Damaged, corroded, or loose wiring/connectors in the EGT sensor circuit can cause high resistance, shorts to ground, or open circuits.

3. Exhaust leak near the sensor

A leak upstream or near the sensor can introduce fresh air, causing the sensor to read lower than expected temperatures and triggering a range/performance fault.

4. Poor electrical connection at the sensor

Corrosion, bent pins, or a loose connector at the sensor can create intermittent or high-resistance connections that disrupt the signal.

5. PCM failure (rare)

A faulty powertrain control module is a very unlikely cause; it should only be considered after all other possibilities have been thoroughly ruled out.

How it's diagnosed

  1. Scan for additional codes and record freeze frame data to identify the conditions when the code set.
  2. Visually inspect the bank 2, sensor 2 EGT sensor, wiring, and connector for obvious damage, corrosion, or loose connections.
  3. Check the sensor's resistance with a multimeter and compare to manufacturer specifications (if available); an open or shorted sensor indicates a fault.
  4. Use a scan tool to monitor live EGT sensor data; compare readings to ambient temperature at cold start and watch for plausible changes as the engine warms up.
  5. Inspect the exhaust system for leaks, especially near the sensor mounting point, which can cause false low readings.
  6. If all else checks out, perform a voltage drop test on the sensor circuit and verify PCM inputs, but only after eliminating all other causes.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2080 — Exhaust Gas Temperature Sensor CircuitP2081 — Exhaust Gas Temperature Sensor CircuitP2082 — Exhaust Gas Temperature Sensor CircuitP2083 — Exhaust Gas Temperature Sensor CircuitP2084 — Exhaust Gas Temperature Sensor CircuitP2085 — Exhaust Gas Temperature Sensor Circuit

Frequently asked

What does the P2086 code mean?

It means the powertrain control module (PCM) has detected that the exhaust gas temperature sensor for bank 2, sensor 2 is providing a signal that is out of the expected range or not performing correctly. This sensor monitors the temperature of exhaust gases after the catalytic converter.

What is the most common cause of P2086?

The most common cause is a faulty exhaust gas temperature sensor itself. Wiring issues, such as damaged or corroded wires, are also frequent.

Can I drive with a P2086 code?

You may be able to drive, but the vehicle could enter a reduced-power or limp mode. It is advisable to address the issue soon to prevent potential damage to the catalytic converter or other exhaust components.

Does P2086 mean I need to replace the PCM?

Almost never. PCM failure is extremely rare for this code. Many drivers are incorrectly told to replace the PCM, but the problem is almost always a faulty sensor, wiring, or connection. The PCM should only be considered after all other causes have been conclusively ruled out.