P2033

Code

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2

Brand: Generic

Type: P — Powertrain

Views: UK: 34 EN: 111 RU: 79

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted EGT sensor wiring (short to battery voltage)
Corroded, loose, or damaged connector at the sensor or ECM
Failed EGT sensor (internal short or wrong output)
Faulty sensor heater circuit (if equipped) or power supply issue
Exhaust leak, turbo or aftertreatment failure causing sensor overheating
Damaged or shorted ECM input or wiring harness

Symptoms

Malfunction Indicator Lamp (MIL/CHECK ENGINE) illuminated
Possible limp/home mode or reduced power in some vehicles
Failed or incomplete DPF/aftertreatment regenerations
Higher than normal exhaust/underbody heat near sensor location
Reduced fuel economy or increased emissions
Stored freeze frame data showing elevated EGT or abnormal sensor voltage

What to check

Retrieve trouble code(s) and freeze-frame/live data with a scan tool
Compare Bank 1 Sensor 2 EGT live values against expected ranges and against Bank 1 Sensor 1 (if present)
Visually inspect sensor, wiring, and connector for heat damage, corrosion, or breaks
Backprobe connector and measure sensor voltage or mV signal with engine cold and hot
Measure sensor element resistance (if thermistor type) or millivolt output (if thermocouple type) per manufacturer spec
Inspect for shorts to battery (B+) or open circuits using continuity checks to ECM connector

Signal parameters

Typical EGT sensor outputs: thermistor/voltage type 0–5.0 V (varies by temp), thermocouple type in millivolts
Expected temperature range: commonly -40°C to +800–1,200°C depending on sensor and location
High-circuit trigger: voltage significantly above expected range (e.g., >4.8–5.0 V) or mV output inconsistent with temperature
Some sensors include a heater circuit; expected heater supply ~battery voltage and heater current depends on sensor design

Diagnostic algorithm

Confirm code and record freeze-frame/live data. Note conditions when code set (engine temp, load, time).
Perform visual inspection of the Bank 1 Sensor 2 harness and connector for heat damage, corrosion, melted insulation, or disconnected pins.
With connector accessible, backprobe sensor and monitor live voltage/mV while key ON and engine running. Compare to Bank 1 Sensor 1 or manufacturer expected values.
Check continuity from sensor signal pin to ECM pin and check for shorts to B+ and ground. Repair any shorts/opens.
If sensor has a heater, verify heater supply and ground, check fuse/relay and measure heater resistance per spec.
Measure sensor resistance (thermistor) cold and after warming, or measure thermocouple mV change with temperature; replace sensor if out of range.
If wiring and sensor test good, inspect exhaust for causes of actual overheating (restricted DPF, failed turbo, collapsed exhaust) and repair as needed.
If wiring, connector, and exhaust are good, test or substitute a known-good sensor. If problem persists, consider ECM input/fuse/ground or ECM fault and consult manufacturer procedures.
After repairs, clear codes, perform a regen or drive cycle and verify the code does not return and live EGT values behave normally.

Likely causes

Damaged sensor harness insulation shorted to B+ causing high voltage reading
Corroded connector pins causing intermittent high/open circuit reading
Failed EGT sensor element producing out-of-range voltage or mV signal
Blown fuse or faulty relay feeding sensor heater or reference circuit
Exhaust component failure (DPF, catalytic converter, turbo) causing real overtemperature

Fault status

⚠️ Status

Exhaust Gas Temperature (EGT) sensor circuit reading is abnormally high for Bank 1 Sensor 2 — possible open/short, sensor failure, wiring or exhaust-related overheating.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours