Technical

Tech Tip: Why Won’t My Audi Warm Up?

Code B10D004 will indicate a coolant circulation pump failure.

By Shop Owner Staff

Published: Mar 7, 2022

Models:

A6/A7: 2012-2015

A8/S8/S8+: 2014-2017

Bulletin: 191790

The customer may complain of a lack of heat in the passenger compartment even if the vehicle has been running for a long period. In the Climatronic control module, one or two DTC codes will be present. Code B10D004 will indicate a coolant circulation pump failure.

Code B11D501 indicates the supply voltage for terminal 30 of the coolant circulation pump has an electrical fault.

To remedy the problem, the V50 coolant circulation pump needs to be replaced.

Ignition System Tests You Should (And Shouldn’t) Follow

Do your technicians use tests that might give inconclusive results or do damage to the coil or drivers inside a module?

By Andrew Markel

Published: Sep 11, 2023

One of the most basic circuits found on every gasoline-powered vehicle is the ignition coil. This transformer takes low-voltage, high-amperage current and changes it into high-voltage current. It has two windings that are not physically connected. What connects them is magnetism. The primary creates an electromagnetic field when system voltage is applied. When the power is turned off, the magnetic field collapses. The energy from the primary is transformed by the secondary windings into high-voltage power that can jump the gap between the electrodes of the spark plug; this is called inductance.

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