Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2
Diagnostic trouble code P2033 indicates that the powertrain control module (PCM) has detected an excessively high voltage signal from the exhaust gas temperature (EGT) sensor located in Bank 1, Sensor 2. This high voltage typically means the sensor circuit is open or shorted to power, preventing the PCM from accurately monitoring exhaust temperatures for emissions control.
While the vehicle will usually remain drivable, driving with a faulty EGT sensor can prevent proper diesel particulate filter (DPF) regeneration or cause the engine to run in a reduced power mode. It should be diagnosed and repaired soon to prevent potential damage to emissions components.
Common symptoms
- Illuminated Check Engine Light
- Reduced engine power or limp mode
- Incomplete or failed DPF regeneration (diesel vehicles)
- Decreased fuel efficiency
- Failed emissions test
Likely causes
- Faulty Exhaust Gas Temperature (EGT) sensor (Bank 1, Sensor 2)
- Broken, chafed, or disconnected wiring in the EGT sensor circuit
- Corroded or loose electrical connector at the EGT sensor
- Short to voltage in the EGT sensor wiring harness
- Severe exhaust leak upstream of the sensor
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Visually inspect the EGT sensor, wiring harness, and connector for Bank 1, Sensor 2.
Look for: Look for melted wires, chafing, broken connections, or heavy corrosion inside the connector that could cause an open circuit or short to voltage.
Use an OBD-II scan tool to monitor the live data for the Bank 1 Sensor 2 EGT.
Look for: Check if the temperature reading is pegged at an extreme high or low value (often indicating an open circuit) and does not change as the exhaust heats up.
Disconnect the EGT sensor and measure its internal resistance using a digital multimeter.
Look for: Compare the resistance reading to the manufacturer's specifications for the current ambient temperature. An infinite resistance (OL) indicates an internally open sensor that must be replaced.
Check the reference voltage and ground at the EGT sensor connector with the key on, engine off.
Look for: You should typically see a 5-volt reference and a good ground. If voltage is missing or battery voltage (12V) is present on the signal wire, there is a wiring issue back to the PCM.
Perform a continuity and short-to-voltage test on the signal wire between the sensor connector and the PCM.
Look for: High resistance indicates a broken wire, while continuity to power indicates a short to voltage in the harness that needs to be repaired.
This page explains the generic P2033 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
Gear guide: Best OBD2 ScannersRead this code yourself next time — from $20 Bluetooth dongles to bidirectional scan tools.Rather have a pro handle it? Find a vetted local mechanic.