manfred_blitz56
GLA auxiliary battery failure
Summary of the thread
A 2021 GLA diesel is experiencing an auxiliary battery failure, indicated by an error message and weak engine start, suggesting a general electrical malfunction possibly due to the battery not charging. A similar issue in another vehicle was resolved by diagnosing a faulty auxiliary battery, which was replaced to fix the starting problems. It is recommended to seek professional assistance for diagnosis and repair, as replacing the auxiliary battery resolved the issue and cleared the errors.
Did this summary help you solve your problem?
4 comment(s)
manfred_blitz56 (community.author)
Voltage drop how would I check that
danielkeller1
The voltage drop can often be observed with a multimeter while the engine is starting. I did not perform the test myself; I entrusted my vehicle to a workshop for diagnosis and repair. Given the potential for electrical issues, I would advise seeking professional assistance to prevent further complications. My dealership diagnosed a faulty auxiliary battery and replaced it, resolving the starting problems.
manfred_blitz56 (community.author)
Understood. Workshop it is. New auxiliary battery fitted. Cleared the errors. 290€. All good.
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
MERCEDES
community_crosslink_rmh_model
GLA
danielkeller1
I drive a Mercedes C-Class and I experienced a similar issue some time ago. The error messages and difficulty with engine start pointed to a problem with the auxiliary power system. Have you observed any voltage drop when starting the car It is a common symptom of battery failure.