If the engine on the vehicles listed above enters limp-home mode, having a low coolant level or air in the cooling system is a potential cause.
Symptom:
While driving, the engine can suddenly lose power or pressing the accelerator has no effect. The cooling water temperature gauge is usually in the normal range when this happens.
Possible cause:
There is not enough coolant in the cooling system, even though the level in the expansion tank may be high enough. Unscrewing the cap from the thermostat housing makes it clear that the coolant level is a few centimeters below the overflow hose. The temperature sensor (image) is no longer in the water under these conditions. The engine control unit switches the engine to limp-home mode.
Remedy:
To remedy this, the cooling system should be filled and inspected and the cap should be replaced.
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Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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