# Service bulletin FSB 593 012

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10200209
- Published by NHTSA: 2021\-08\-09
- Manufacturer's number: FSB 593 012
- Manufacturer's date: 2016\-01\-01
- NHTSA component: SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL

## NHTSA's summary

On some VOLVO VHD, VN, VT, and VAH truck models built between 04/31/2008 and 11/30/2015, the solenoid valve for the Hill Start Assist feature is prone to internal contamination in harsh environments. The internal contamination of the solenoid valve is caused by the buildup of grime, salt, road debris and other solid contaminants. In some cases, the buildup of solid contaminants caused the solenoid valve to malfunction. A similar malfunction is possible if the solenoid valve is equipped with a vent fitting that freezes over. The malfunction causes the trailer brake circuit to maintain trailer brake pressure after a grade Hill Start Assist event. Replacement of the existing solenoid valve, elbow, and the addition of a new tube fitting and tube will ensure proper functionality of the Hill Start Assist feature.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2016/MC-10200209-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2016/MC-10200209-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Electrical system, Equipment and accessories

## Vehicles listed

- 2008 to 2015 VOLVO VAH
- 2008 to 2015 VOLVO VHD
- 2008 to 2015 VOLVO VN
- 2008 to 2015 VOLVO VT

JSON: [/v1/bulletins/10200209](/v1/bulletins/10200209)

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