Product Details

This is a repair service for a Mercedes-Benz diesel glow plug control module used on 3.0L V6 (OM642) and 3.2L inline-six (OM648) diesel engines. We repair your original module by replacing failed components and known failure points, so it goes back in with no programming.

Part Numbers We Repair

• A6421531979 (6421531979) – 3.0L V6 diesel. Also listed as A6421532079.
• A6481530279 (6481530279) – 3.2L inline-six diesel.

Please match the part number on your module's label before ordering. Not sure which one you have? Send us a photo of the label and we'll confirm.

Common Issues

• Hard starting or long cranking when cold
• White smoke at startup
• Glow plug or check engine light
• P0670 – Glow plug module control circuit
• P0671–P0676 – Glow plug circuit, cylinders 1–6
• P0683 – Glow plug module to engine computer communication

A failed glow plug can set the same codes. Test the plugs before you send the module.

Vehicle Fitment

3.0L V6 diesel – A6421531979

• 2007 - 2009 Mercedes-Benz E320 BlueTEC / CDI
• 2007 - 2008 Mercedes-Benz ML320 CDI, GL320 CDI, R320 CDI
• 2007 - 2012 Sprinter 2500 / 3500 3.0L diesel (Dodge, Freightliner and Mercedes-Benz)

3.2L inline-six diesel – A6481530279

• 2005 - 2006 Mercedes-Benz E320 CDI

Some models used more than one module during these years, so the part number on your module is what counts.

What To Include In The Box

• Your full name, phone number and email
• Vehicle year and model
• Trouble codes, if you have them
• The symptoms you're seeing

Send the module only. Keep the vehicle-side wiring and connectors.

Our Repair Service

• Fast turnaround: Industry-leading repair speed
• No-Hassle warranty: Confident repairs deserve confident guarantees
• World class support: Commitment, quality, and care that set us apart
• Upgraded components: We use high quality replacement components, OE spec or better
• No programming required: We repair your original module, so it plugs right back in
• USA remanufacturing and repair: Located in Toledo, OH

Photo is representative. Your module may look different.