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Ignition Control Module Replacement
 
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Pelican Technical Article:

Ignition Control Module Replacement

Jared Fenton

Time:

1 hour1 hr

Tab:

$200 to $400

Talent:

**

Tools:

Heat sink compound, Phillips head screwdriver, solvent cleaner

Applicable Models:

Audi A6 Quattro (2000-04)

Parts Required:

Ignition Control Module

Hot Tip:

Be sure to use new heat sink compound on the modules

Performance Gain:

Better running car

Complementary Modification:

Replace spark plugs

The ignition control modules on the Audi A6 2.7T control the ignition sequence for both banks of the engine. Over time, the ignition modules can wear out and cause rough running. This usually results in an error code being triggered for one or both cylinder banks on each side of the engine. If this is the case, there is an easy way to check if an individual module is bad. Clear the code using the VAG-COM or an OBD reader and then swap the electrical connectors from one control module to the other. Start the car and wait until the error code reappears. If the code now states the other bank has trouble, you know one of the modules is bad.

I recommend changing both modules at the same time. Over time, heat and oxidation take their toll on underhood electrical components, usually leading the other module to wear out not long after. Keep in mind that you will need to clean the mounting surface for the ignition control modules before fitting the new ones. There is a layer of heat sink compound on the underside of each module. This layer should be replaced anytime the modules are removed. Use solvent to clean the old solvent off. You can find the compound at any computer component supplier. When adding the new layer, place a dime sized blob on the underside of each module and secure it to the mounting plate. As you tighten the module down, the compound will be pressed out over the bottom of the ignition control module.

Shown here are the two ignition control modules on the 2.
Figure 1

Shown here are the two ignition control modules on the 2.7T Audi A6. Begin replacement by pressing the metal release tabs (green arrows) and pull the electrical connectors off.

Loosen and remove the four Phillips head screws (green arrows) and lift the ignition control modules off the mounting plate.
Figure 2

Loosen and remove the four Phillips head screws (green arrows) and lift the ignition control modules off the mounting plate. Once the modules are removed, use some solvent cleaner to clean the heat sink compound off the mounting plate.

Shown here is the underside of the ignition control unit with the layer of heat sink compound.
Figure 3

Shown here is the underside of the ignition control unit with the layer of heat sink compound. Place a dime sized dab of new compound on the underside of the new ignition control units and then secure them in place. Tightening the Phillips head screws will spread the compound out over the module. Repeat the process for the other modules and reattach the electrical connectors.

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Page last updated: Fri 7/21/2017 03:32:20 AM