A temperature reading that jumps suddenly deserves a different description from an engine that gradually overheats. If P0116 appears, keep that distinction in the repair enquiry. The dashboard indication and the value recorded by the diagnostic tool are both useful, but should be identified separately.
What the VAG reference covers
Ross-Tech associates P0116 / 16500 / 000278 with an implausible G62 coolant-temperature signal. It lists the sensor, wiring and connections as areas to investigate, and includes a note about checking the fitted fan-control module or relay part number. Read the reference.
The entry does not establish that every P0116 vehicle needs the same sensor or control unit. Use the engine identification and its repair information.
Save the conditions around the reading
- Was the engine cold after standing overnight, partly warm or fully warm?
- Did the temperature change smoothly or jump abruptly?
- Were there starting, idle or cooling-fan symptoms at the same time?
- Has a sensor, thermostat, fan controller or wiring connector recently been changed?
For a garage referral, include a labelled recording rather than a single unexplained temperature screenshot. State which controller supplied the value and whether the fault was present during the capture.
Decide whether the vehicle is needed
The complete vehicle may be necessary to investigate a changing signal. Do not remove the ECU simply because it reports the code. Genuine overheating still requires prompt attention; never open a hot pressurised cooling system to investigate a scanner reading.
Send AXION the P0116 report to discuss electrical diagnosis or a supported module assessment. Workshop work is by appointment; suitable postal enquiries are welcomed from across the UK.
Reviewed September 2026. Use the complete manufacturer-specific fault description and vehicle repair information.