Audi A4 Allroad 2012–2015 — technical service bulletin
Bulletin A011652 2040491- · NHTSA communication 10118301 · issued Jan 20, 2016
Technical service bulletin
communication type
Engine and Engine Cooling
component
2012–2015
model years
18
vehicle entries
Official summary
MIL on (DTC P1B1C); message in information panel: "Coolant System: Fault Turn Off Engine" The condition is caused either a defect with the thermostat (in model year 2012 and 2013 vehicles) or The diagnostic software is incorrectly displaying the warning. No technical issue exists. Solutions are an improved thermostat installed in production and the diagnostic software has been updated.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.