Volvo Tech Tip: A/T-Neutral Control Function
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Volvo Tech Tip: 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.

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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.

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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).

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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.

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