P2488

Code

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 5

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 38 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted sensor wiring (to ground or battery voltage)
Corroded/loose connector or poor pin contact
Failed EGT sensor (thermocouple/thermistor)
Sensor contaminated or physically damaged by soot/overheat
Faulty sensor heater circuit (if equipped)
Exhaust leak or incorrect sensor placement

Symptoms

Malfunction indicator lamp (MIL) / Check Engine light illuminated
Reduced engine performance or limp mode on some vehicles
Elevated emissions or failed emissions test
Unusual exhaust smells or visible soot in exhaust area
May be intermittent — faults often set under specific load or temperature conditions

What to check

Read freeze frame and live data to confirm conditions when code set
Scan for additional codes that could point to wiring or ECM issues
Visually inspect sensor, connector and harness for heat damage, corrosion, soot or broken wires
Check for exhaust leaks or recent exhaust work near the sensor
Verify sensor is correctly mounted and not physically contaminated or clogged

Signal parameters

EGT sensor output: thermocouple sensors generate millivolt (mV) signal that increases with temperature (low mV at ambient, rising as exhaust temp increases)
Thermistor-type sensors: resistance falls or rises predictably with temperature — compare to manufacturer chart
Heater-equipped sensors: heater supply typically switched by the ECM; expect battery voltage at supply when commanded and measurable current (often tenths to a few amps) through heater
Connector reference: harness should show proper reference voltage/ground per vehicle wiring diagram (often 0–5 V for sensor circuits, mV for thermocouples)

Diagnostic algorithm

Obtain freeze frame and live data; note ambient and exhaust conditions when the code set
Inspect sensor and harness for obvious damage, corrosion, soot, or poor connector seating
With key on engine off, check for reference power and ground at the sensor connector against vehicle wiring diagram
Back-probe sensor signal while warming engine or under conditions that set the code; verify signal moves smoothly with temperature and does not float, bottom out or clamp
Measure continuity and resistance between sensor pins and ECM connector to find opens or shorts; wiggle harness to reproduce intermittent faults
If sensor has a heater, command heater on via bi-directional scan tool (if available) and measure heater supply voltage and current; compare to spec
Compare sensor readings to expected behavior or to a known-good sensor; replace sensor if out of spec
If harness and sensor check good, verify ECM inputs/grounds and inspect for software updates or known issues; replace ECM only after exhausting wiring and sensor checks
Clear codes and perform road or dyno test to verify repair

Likely causes

Damaged harness or connector at Bank 2 Sensor 5
Failed EGT sensor element (no or erratic output)
Heater circuit not energizing or drawing abnormal current
Short to battery or ground at sensor circuit

Fault status

⚠️ Status

Monitored fault — Exhaust Gas Temperature Sensor Circuit Range/Performance detected on Bank 2 Sensor 5. ECM reports sensor output outside expected range, erratic response, or heater-circuit abnormality.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours