Audi’s Haldex Problem - Causing Fault Code 01324

The control module for the fifth-generation Haldex all-wheel-drive (AWD) system has proven to be a common failure point across a range of VAG vehicles. When the Haldex ECU develops an internal fault, particularly in Audi models, you’ll find that fault code 01324 – control module for all-wheel-drive (J492): no signal/communication is typically stored.

Shop Now - 01324 Audi Fault Code Solution

Acting as a more responsive upgrade to its predecessor, the 5th generation Haldex control module distributes torque between the front and the rear axles when additional traction is needed. 

In Audi models, the fifth generation Haldex system is fitted to 2012-2023 Quattro vehicles with transverse-mounted engines, including AWD variants of the Audi A3, Q3, and S3. However, the same rear differential mounted AWD system is also used across the wider VAG range, appearing in many Volkswagen 4Motion models and selected Skoda vehicles, such as the VW Tiguan and Skoda Yeti. This means that fault code 01324 is a common issue for many drivers whose vehicles are equipped with Haldex Gen 5 systems.

Audi Haldex Gen 5 - Fault Code 01324 Explained

Under normal operation, the Audi’s Gen 5 Haldex ECU receives live data from other control modules over the CAN bus, including inputs from the ABS, engine, and transmission systems. The control module then uses this data, such as wheel speed, throttle position, and brake pressure to control clutch engagement to regulate rear-axle torque.

However, if the module develops an internal malfunction and stops transmitting over the CAN bus, the AWD system registers this and enters a failsafe mode, disengaging the clutch pack and disabling torque transfer to the rear axle. 

When communication with the Haldex control module is lost, fault code 01324 is stored in the Audi, confirming a complete loss of communication between the other control modules and the AWD system. The vehicle then displays the traction-control or ESP warning lights as a result of the AWD system being disabled. With the rear axle being disengaged, rapid acceleration or sudden changes in wheel speed are more likely to result in wheelspin, particularly on low-grip surfaces.
 

Audi Haldex Control Unit - Rebuild Or Replace To Resolve 01324?

If you are experiencing any of the symptoms outlined above, or have fault code 01324 stored in your Audi, you have most likely been advised to replace the Haldex ECU to resolve the problem. This is not the most efficient solution, as the fault stems from built-in internal design flaws, and replacement units are at high risk of experiencing a repeat malfunction down the line.

Instead, we recommend a rebuild of your Haldex control module. A full and comprehensive rebuild will not only clear the 01324 fault code and accompanying symptoms, but will prevent the problems from returning in your Audi. Each Haldex ECU we receive is thoroughly tested before and after the remanufacturing process, then returned ready to fit.  

Our 01324 Solution

If you have a 01324 fault code stored in your Audi, we can help by rebuilding your Haldex Gen 5 control module and getting it back to you within 2-3 working days, problem-free. Once remanufactured, the unit will not need recoding back to the vehicle, simply plug it back in and enjoy AWD functionality once again. Every rebuild we complete includes our unlimited-mile lifetime warranty as standard.

Fill out our test form to start your Haldex ECU rebuild today.

Common failure symptoms:

• AWD function not working
• No communication to the Haldex Gen 5 ECU
• Traction control light illuminated
• ESP light illuminated

Common fault codes: 

• 01324 - Control Module for All Wheel Drive (J492): No Signal/Communications
• U1121 - Transmission (CAN message)/databus missing message
• U0114 - Lost Communication with Four-Wheel Drive Clutch Control Module

Test and rebuild:

We thoroughly test each Audi Haldex Gen 5 ECU on our custom built hardware-in-the loop testing rigs to uncover even intermittent faults. Upon pinpointing any faults, our technicians will then rebuild the Haldex ECU with higher-quality-than-standard components to ensure the fault does not return.

Programming:

As all coding is retained throughout the rebuild process, you will be able to simply plug your Haldex Gen 5 control module back in and enjoy AWD once again.

Quality:

With an industry-leading defect rate of just 0.49%, we ensure quality comes first for all of our rebuilds.

Warranty:

Lifetime unlimited mileage*

How do I get my unit rebuilt?

To pay for the rebuild click the Shop Now link above, select your part number and click: Get yours rebuilt.

Print the payment/booking confirmation email.

Package the control unit inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received we will test, rebuild and return your unit with an unlimited mileage lifetime warranty. If your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping.

What if I don’t want to pay up front?

This is not a problem, if you prefer this option then follow the following steps:

Fill in and submit this test form.

Print the booking confirmation email.

Package the Haldex control module inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received, we will test your module and call you to advise on the outcome of testing, if your Haldex Gen 5 ECU is faulty and you choose to go ahead with the rebuild then we will take payment over the phone using a debit/credit card.

We will then rebuild your control module and return it to you with an unlimited mileage warranty.

If you require further information regarding this Audi Gen 5 Haldex control module fault, then please contact us.