Description
Function of the Exhaust Temperature Sensor
The turbine-inlet exhaust gas temperature (EGT) sensor measures exhaust temperature directly before the turbocharger and reports it to the engine ECU. Its main job is protecting the turbo from heat damage by allowing the ECU to limit boost or fuelling when temperatures climb too high. It is a thermistor-type sensor with a 12 V supply. A faulty or out-of-range sensor can cause reduced power or limp mode, incorrect protection of the turbo, and a warning light. Fitting a correctly calibrated sensor restores accurate pre-turbo temperature monitoring.
Common Diagnostic Trouble Codes (DTCs) — a generic reader shows the 5-character code; the GWM P-Series GW4D20M system stores the 7-character form in brackets:
- P0545 [P054500] — sensor circuit short to ground (signal below ~0.05 V)
- P0546 [P054600] — circuit open or short to power (signal above ~4.88 V)
- P183F [P183F00] — implausible reading (cold-soak cross-check failed)
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