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Re: abs require service
The code is for the Vehicle Speed Signal (VSS). The VSS is produced by the ABS electronic control unit by averaging wheel speed sensor inputs and sending a digital signal via CAN bus to other modules that use the VSS. To test the ABS, a Volvo-compatible scan tool is necessary. If one is not available, the car should be sent to a Volvo dealer for ABS diagnosis.
I can tell you however that most of the cars are fixed by replacing the ABS Control Module.
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Does ABS work properly? Get on dirt road and try to lock brakes (do this carefully insuring no police car tailgating,lol) Could be bad wheel speed sensor. Check codes with scan tool capable of reading ABS and trans codes.
This is common for most cars. The brake light is required to come on with the ABS. But the ABS is not required to come on with the brake. If both lights are on I would take it to Auto-Zone or Advance Auto and have a free diagnostic scan run. With the codes they provide we can further suggest action from there. Typically ABS codes are related to wheel sensors. If 1 sensor goes bad it sets a code pinpointing its location. Not to fear tho..Even with the ABS light on you still have good brakes. In the event of ABS failure the braking system reverts to standard braking.
cars or trucks that have an abs brake system, have an abs pump controller, if you replaced your brakes and and let fluid escape at each wheel, air can get into the abs pump, and will require an abs scan tool, to bleed the abs pump. there is no shortcut to doing this function that is safe. not all shops will have this
scan tool, its not a regular scan tool with an abs code reader that allows you to see the codes, you will have to call around to get the best price. the dealer has the scan tool or other shops may have it. and you cant just go buy the tool, its expensive. min. charge around 100 dollars on up for a shop to bleed the abs pump. good luck!
Per other sites I've seen these 2 codes p1618,p0722, are your ABS module. It can be taken out and re soldered and will work fine. Many Volvo mechanics know how to do this or you can find a repair service on Ebaymotors possibly. My guy charges me $150. Supposedly you can even drive the car without the module installed but you won't have abs so don't expect to stop as you usually would with a correctly working ABS. Your tires will now skid old school instead of the abs module taking over and pullsing your brake pedal, etc.
its more advisable to repair the abs than to disconnect vehicles do not pass inspection with the abs disconnected -since the trouble code will be in the computer memory ---check the connections to the sensors the biggest problem is usually debris knocks loose the connection or damages a wire ---have the car scanned most auto stores such as auto zone / advanced auto offer this service for free the trouble code will pinpoint the problem for u ----but if u still want to disconnect the abs remove the fuse [[some cars and trucks sometimes have other components attached to the fuse or if u have traction control will shut it down also ]]]]
You most likely have a problem with the ABS brake system. First, check your brake fluid level as many vehicles have a fluid level switch that monitors brake fluid level and if the level is low it can turn off the ABS and turn on all those lights.[ABS is part of the Trac control] If that is good then you may have a failing wheel speed sensor, wiring, or a problem with the ABS controller itself which would require having someone connecting to and reading the ABS service codes with a scan tool to identify what the system saw that caused it to turn itself off. Brakes are a very important safety item so you should get it repaired as soon as possible!
P1550 "manufacturer controlled speed metering" Basically the code means the ABS module either lost communication or
there is a fault in either front WSS's. You need to get a scantool to
access the ABS to really diagnose it.
check fuse and relay then check the wires and connections to ur abs check the abs sensors connections that they are hook into clip properly if good have car scanned for the trouble code some auto stores such as auto zone / advanced auto scan for free the code (s) will give u a start point