Glow Plug Control Unit Relay Module for Mercedes-Benz Dodge Sprinter 2500 3500

A Sprinter that cranks for a long second or two on a cold morning, then clears its throat in a cloud of white smoke, is telling you the pre-heat circuit is not doing its job. The glow plug control module is one of the parts that can cause that. It is not automatically the one at fault.

Diagnose the circuit, don't just replace the module

A failed pre-heat circuit very often comes down to the glow plugs themselves. They are consumable items, and a single open-circuit plug will log a fault that reads as a controller problem. The supply fuse, the loom, the connector at the module and the request signal from the engine control unit all sit in the same chain. Have the circuit tested properly, with each plug measured for resistance and current draw, before spending money on a module. Where testing confirms the controller has failed, this is an aftermarket replacement for it.

Numbers, vehicles and the diesel-only note

The supplier publishes eight OE references: A6429007701, 6421533779, 6429002700, 6429005701, 6429007701, A6421533779, A6429002700 and A6429005701. Those are cross-references for matching, not a statement about who manufactured the part. The listed vehicles are Dodge Sprinter 2500 and 3500 from 2007 to 2009, Freightliner Sprinter 2500 and 3500 from 2007 to 2012, and Mercedes-Benz Sprinter 2500 and 3500 from 2010 to 2012, all with the V6 3.0 L diesel engine. The supplier states diesel models only, not petrol. Those 2500 and 3500 designations are North American market names, so Australian buyers should match on the OE number or the VIN rather than the model badge.

Key features

• Eight OE cross-references: a wide list of numbers to check your original against, including both the plain and A-prefixed forms.
• Single module: supplied as one piece, replacing the existing controller directly.
• V6 3.0 L diesel applications only: the supplier is explicit that petrol models are not covered.
• Aftermarket replacement: not a genuine Mercedes-Benz part and not described as one.

Specifications

• Item type: glow plug relay control module
• Quantity: one piece
• OE cross-references: A6429007701, 6421533779, 6429002700, 6429005701, 6429007701, A6421533779, A6429002700, A6429005701 — published as a matching aid, not a claim of origin
• Connector type and pin count: not published by the supplier
• Dimensions and mounting: not published by the supplier
• Fuel type: diesel only

Before you fit this module

• Have the glow plug circuit diagnosed before ordering. Worn plugs, a blown fuse or a damaged loom will produce the same symptoms as a failed controller, and replacing the module will not fix any of them.
• Fitting and the post-fit check should be done by a qualified person, with the battery disconnected before the module is unplugged.
• Confirm your original part number against the eight references above, or supply your VIN, before ordering. The supplier asks for exactly this where there is any doubt.
• Check the engine is the V6 3.0 L diesel. Petrol models are excluded.

Get the diagnosis done first, then match the number. Both steps are quicker than fitting a module the van did not need.

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