Tech Tip: Volvo A/T-Neutral Control Function

Tech Tip: Volvo A/T-Neutral Control Function

A function called "Neutral Control" is present on all 2001 V70 and S60 cars, as well as on 2002 non-turbo V70 and S60 cars built before January 2002. When the vehicle comes to a stop, the Transmission Control Module (TCM) activates Neutral Control. Even though the gear selector is in the Drive position, a Neutral condition is engaged hydraulically in the transmission. Neutral Control disengages when the brake pedal is released or the throttle is applied.

A function called “Neutral Control” is present on all 2001 V70 and S60 cars, as well as on 2002 non-turbo V70 and S60 cars built before January 2002. When the vehicle comes to a stop, the Transmission Control Module (TCM) activates Neutral Control. Even though the gear selector is in the Drive position, a Neutral condition is engaged hydraulically in the transmission. Neutral Control disengages when the brake pedal is released or the throttle is applied.

When the neutral control function is incorrect, there are three symptoms that can be felt in the car:

1. After coming to a complete stop and keeping the brakes applied, a “thump” can be felt in the car. It’s felt about two seconds after coming to a stop.

2. When releasing the brake, there is a harsh or double re-engagement of drive.

3. When idling in “D” range with the brake applied, the engine speed oscillates (fluctuates).

In addition to these symptoms, some cars may set a DTC 012A or 012B in the TCM; these should be erased before downloading the software.

Note: Neutral Control is not active during the following:
• Transmission in “W” mode;
• Transmission in Geartronic mode;
• Gear selector in “L” range (non-Geartronic shifter); and
• Operating with high AC demand (higher idle speed).

Service Procedure:
Upgrade the TCM (software P/N 30677036). In addition to correcting the Neutral Control symptoms, this software package also improves response during power-on downshifts and minimizes 2-3 shift flare. There is no need to reset the adaptation to zero.

Technical service bulletin courtesy of ALLDATA.

For additional information, visit www.alldata.com.

You May Also Like

Gravity Releases Universal EV Charging ‘Trees’

The ‘trees’ require no utility upgrades and are capable of providing 200 miles of range in either 13 minutes (200kW) or 5 minutes (500kW).

Gravity has released a new universal on-street mounting and cable system, dubbed “DEAP Trees,” for its 200kW and 500kW Distributed Energy Access Points (DEAPs). Gravity said it is striving to develop a network of on-street DEAP charging more expansive than Tesla’s current Supercharger network.

Gravity’s engineers, in collaboration with design firm Rangr Studio, took on the challenge of solving frictions in curbside charging today. Each Gravity universal DEAP Tree has a hinged swing arm holding a cable that pivots down when charging begins, allowing it to reach the port of every make and model. When charging is completed, the arm raises automatically and the EV connector latches back onto the pole and out of sight.

Randy Breaux, Group President, GPC North America, Talks to AMN Drivetime

At NAPA, “Breaux Knows” business relationships, ABCs to avoid, and serving the automotive professional.

Is Training For The Sake Of Training Always Worth It?

Technology changes every day. Are you keeping your techs in top shape?

Understanding Customer Clunking And Clicking Complaints

Can Your Techs Diagnose and Repair Modern Axle Complaints?

Comprehensive Guide to Serpentine Belt and Drive System Maintenance

Properly maintaining the entire drive system prevents premature belt wear and system failure, ensuring customer satisfaction and vehicle reliability.

Other Posts

How Modern Car Sensors Optimize Performance and Emissions

Learn how Standard ensures accuracy, speed, and durability in their sensors to maximize engine performance and efficiency.

Chassis Parts and Alignment Angles

Knowing why the adjustment is required is critical to performing the total alignment.

Top 10 Wheel Bearing Torque Tips

A torque wrench is an essential tool when it comes to installing wheel bearings.

Blink CEO to Present at Energy, Power & Renewables Conference

The event is scheduled for June 17 at 1:10 p.m. ET.