detlefknight1
Master preheating lamp issue
Summary of the thread
A 2011 Renault Master diesel had a persistent preheating lamp issue, a check engine light, and emitted smoke during acceleration. The problem was traced to a faulty connection to the preheating unit, likely caused by engine vibrations loosening the connections over time. The solution involved inspecting and securing the connections near the battery, with a local garage cleaning and replacing some wiring, resolving the issue effectively.
Did this summary help you solve your problem?
4 comment(s)
detlefknight1 (community.author)
I had a quick look, but maybe I wasn't thorough enough. Whereabouts is the preheating unit located exactly? And what should I be looking for, like, is it obvious if a connection is bad?
dieterkrause1
Okay, so on mine (it's the same model), the preheating unit is near the battery under the bonnet. Give all the connections a wiggle; you might find one that's loose or corroded. Honestly, though, if you're not comfortable, it might be worth taking it to a workshop. They'll have the proper diagnostic tools to pinpoint the issue. Could save you a lot of hassle!
detlefknight1 (community.author)
I took it to a local garage and you were spot on, a dodgy connection to the preheating unit. They cleaned everything up and replaced a bit of wiring. Cost me 95€ all in. Runs like a dream now!
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
RENAULT
community_crosslink_rmh_model
MASTER
dieterkrause1
That sounds familiar! I had a similar issue with my Master. The preheating unit was the culprit. Have you checked the cable and plug connections to the actual unit itself? That's where my problem was. All that engine vibration can loosen things up over time. The glow plug light staying on is a dead giveaway!