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Failure mode - Mercedes-Benz 2.1L Twin-Turbo Diesel (Sprinter 2014-2018)
Glow plug module and cold starts
Reliability tier: aggregated - verify before ordering, see /disclosure/
Symptoms
- glow plug lamp flashing (cylinder-level fault)
- cold-start roughness on cold mornings
Compare with the other causes of the same sign on this engine: misfire, rough idle, hesitation or surging (3 causes)
Root cause
Same Mercedes-diesel wear-item pattern as the V6: the glow module drives the plugs and reports cylinder-level faults; the flashing lamp names the cylinder. Community consensus tier.
Diagnosis
- read glow module DTCs per cylinder; measure plug resistance before condemning the module
- verify battery health first - weak cranking mimics glow faults
Fixes
glow plug(s) and/or module replacement per diagnosis ()
Prevalence
common
Affected configurations (20)
- 2014 Freightliner Sprinter 2500
- 2014 Freightliner Sprinter 3500
- 2014 Mercedes-Benz Sprinter 2500
- 2014 Mercedes-Benz Sprinter 3500
- 2015 Freightliner Sprinter 2500
- 2015 Freightliner Sprinter 3500
- 2015 Mercedes-Benz Sprinter 2500
- 2015 Mercedes-Benz Sprinter 3500
- 2016 Freightliner Sprinter 2500
- 2016 Freightliner Sprinter 3500
- 2016 Mercedes-Benz Sprinter 2500
- 2016 Mercedes-Benz Sprinter 3500
- 2017 Freightliner Sprinter 2500
- 2017 Freightliner Sprinter 3500
- 2017 Mercedes-Benz Sprinter 2500
- 2017 Mercedes-Benz Sprinter 3500
- 2018 Freightliner Sprinter 2500
- 2018 Freightliner Sprinter 3500
- 2018 Mercedes-Benz Sprinter 2500
- 2018 Mercedes-Benz Sprinter 3500