☰
GET A QUOTE

Q: My Audi revs but will not drive in reverse. The ABS light is on and the brake light flashes on the dash. What could be the cause?

asked by on October 24, 2016

Audi revs but will not drive in reverse...ABS light is on & Brake light flashes on the dash. What do you think I need?

My car has 120000 miles.
My car has an automatic transmission.

Recommended Services

Transmission Oil Pressure Switch Replacement $158.32 - $745.73 Get a Quote
Or For Any Other Auto Repairs Get a Quote

The transmission needs around 100 psi pressure to operate all of the forward gears, but it needs 180-190 psi pressure for the reverse gears.

The transmission pump is designed to create 1000 psi of pressure and it is regulated by a pressure regulator located next to the pump. Check the wiring harness to the transmission and check the pressure to the transmission pump through the cooler lines. If the pressure is about 30 psi to 45 psi on the cooler lines and the wiring harness is in good condition, then the pump and the regulator is working correctly. In that case, the problem would now be within the transmission valve body (control module).

If the pressure is higher than 45 psi on the cooler lines, replace the pressure regulator solenoid in the transmission. If you need assistance, get a certified professional, such as one from YourMechanic, to replace the transmission oil pressure switch for your vehicle.

Audi
transmissions
2001
A6 Quattro
reverse
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car had a hunting idle so replaced Iac valve and now it idles at 2200 rpm's cold and 1000 rpm's warmed up.
Hello. You car does have an adaptive memory when it comes to the idle control valve. Over time the computer is going to adjust the placement of the valve to compensate for water and carbon build up. In some cases,...
Read more
There is a loud humming noise coming from from passenger side of car that starts at about 40mph.
Hi, thanks for writing in. I'd be happy to help. I would suggest checking the wheel bearings (https://www.yourmechanic.com/article/symptoms-of-bad-or-failing-wheel-bearings) as a worn wheel bearing can create this loud hum you are describing. Wheel bearings are subjected to a lot of friction...
Read more
Battery light
Hello. This may be caused by a faulty ground connection or potentially a bad voltage regulator. Try checking to be sure you have a good connection from the battery to the car's chassis (black negative battery cable from the battery...
Read more
What is causing the engine misfires?
It is usually best to change all the coils when chasing a misfire with engines of this age and mileage. If one is weak, they are likely all weak. When you changed the plugs, was there oil in the spark...
Read more
Something under my car. Is making a terribly loud popping noise ( multiple multiple pops) 2003 Mercedes ML350
Hello - noises from under the car when starting and stopping (https://www.yourmechanic.com/question/suspension-up-front-makes-a-ton-of-noise-creaks) are most likely from suspension components, especially with your advanced mileage. The vehicle rocks front-to-back in both scenarios because of shifts in weight distribution. Worn ball joints, control...
Read more
Where is the camshaft position sensor located on a 2011 Kia Optima EX GDI
Hi there - the camshaft position sensor (https://www.yourmechanic.com/article/how-to-replace-a-camshaft-position-sensor-by-mia-bevacqua) is located on the drive-side end of the top of the engine on your vehicle. It is a round black plastic housing - golf-ball size - attached to the engine with one...
Read more
oil pressure low light came on one time for a few mins, went out hasnt came back on. what does that mean
When a low oil pressure warning (https://www.yourmechanic.com/services/oil-pressure-light-is-on-inspection) is displayed, it can normally be narrowed down to one of three basic causes. An oil pressure sensor that is reading a faulty pressure, oil pressure that is actually low due to worn...
Read more
Clicking sound
What you are describing sounds like a failing CV joint (https://www.yourmechanic.com/services/axle-cv-shaft-assembly-replacement). A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to the wheels. The CV...
Read more
What is that black thing in front of my car that's hanging?
Hi There, A number of things are black in color and may drag from the front of the vehicle if they happen to be loose or broken. There are many different under carriage guards that help to protect various engine...
Read more

Related articles

How Do You Know When Your Transmission Fluid Needs to Be Changed?
Transmission oil or fluid is a vital part of your vehicle’s performance, as it lubricates the various components and inner...
Read more
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
Read more
A Buyer’s Guide to the 2012 Audi A5
For For drivers who want a comfortable ride, expert handling and luxurious amenities, the 2012 Audi A5 will certainly fit the bill. Designed for performance and to deliver a gorgeous look, this model offers an array of options and features...
Read more

Browse other content

Estimates
Maintenance
Cars
Cities