P24C3

Code

Generic P — Powertrain

Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 31 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Faulty EGT sensor(s) on Bank 2 (open, shorted, out-of-spec output or slow response)
Wiring harness damage, chafing, breaks or short to ground/power between EGT sensors and the ECM
Poor or corroded connector pins or moisture intrusion at sensor connectors
Exhaust leaks near sensor locations altering measured temperatures
Contaminated or physically damaged sensors (soot, metallic deposits, thermal shock)
Faulty EGT sensor heater circuit (if equipped) or blown fuse/relay

Malfunction Indicator Lamp (MIL) illuminated
Stored DTC(s) related to EGT or sensor correlation
Reduced engine performance or derate (some vehicles enter limp mode)
Poor fuel economy or failed emissions/inspections
Problems with diesel particulate filter (DPF) regeneration or abnormal regen behavior
Visible soot, smoke, or unusual exhaust behavior under load

Retrieve freeze frame and live data with a professional scan tool; note EGT readings for all sensors on Bank 2 and compare with Bank 1
Visually inspect EGT sensors, wiring harness, and connectors for damage, corrosion, heat damage, or contamination
Check for exhaust leaks near sensor locations (manifold, joints, flanges, gasket areas)
Backprobe connectors to check sensor supply, signal and ground circuits with ignition on and during engine run (refer to vehicle wiring diagram)
Measure sensor resistances or output signal per manufacturer specification where available
Check for stored related codes (wiring, heater circuit, ECM) and relevant technical service bulletins (TSBs)

EGT sensors produce a temperature-proportional signal (thermocouple voltage or resistance change depending on sensor type); signal should rise with engine load and during DPF regen
Typical idle EGTs: near ambient to low hundreds °C depending on engine and operating state; high load/regeneration can exceed 600–1000°C (verify vehicle-specific limits)
Sensors should show correlated trends across adjacent sensors on the same bank; absolute differences should remain within manufacturer tolerances
Heated sensors: heater circuit should have proper supply voltage and draw expected current when commanded by ECM
No sudden spikes, dropouts, or frozen values in live data while changing engine load

Connect a professional scan tool, read all stored codes and freeze frame data. Confirm P24C3 and note related codes.
Observe live EGT data for all sensors (Bank 1 and Bank 2) at key conditions: cold start, idle, steady load, and during a controlled load or DPF regen. Look for mismatch or one sensor showing significantly different absolute values or response time.
Perform visual inspection of Bank 2 sensors, harness and connectors. Repair any obvious damage or corrosion.
Check for exhaust leaks near Bank 2 sensors (manifold, gaskets, joints). Repair leaks and re-test.
Backprobe sensor connector pins to verify reference voltage/power, signal and ground integrity per wiring diagram. Repair open/short circuits or bad grounds.
Measure sensor output or resistance (and heater resistance if equipped) against manufacturer specification. Replace any sensor out of spec.
If electrical checks pass but readings remain inconsistent, swap a suspect sensor with a known good sensor (if same type and accessible) and re-check correlation to isolate sensor vs harness/ECM.
If harness and sensors test good, inspect ECM grounds/power and consider ECM software update or module fault; consult OEM procedures before replacing ECM.
Clear codes and perform verification test drive or regeneration cycle to ensure code does not return.