Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161209-60852-12vxkcgjs:136:3912)
    at m.mountComponent (/tmp/execjs20161209-60852-12vxkcgjs:47:15602)
    at /tmp/execjs20161209-60852-12vxkcgjs:49:31860
    at a.r.perform (/tmp/execjs20161209-60852-12vxkcgjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161209-60852-12vxkcgjs:49:31821)
    at r (/tmp/execjs20161209-60852-12vxkcgjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161209-60852-12vxkcgjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161209-60852-12vxkcgjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161209-60852-12vxkcgjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161209-60852-12vxkcgjs:173:8

P0858 OBD-II Trouble Code: Traction Control Input Signal Low

diagnostic check engine light

P0858 code definition

When the powertrain control module (PCM) detects a problem with the traction control input signal circuit, a P0858 trouble code is stored. The traction control input signal circuit delivers data to the PCM via a signal, which the PCM then uses to calculate how much the engine revolutions per minute (RPMs) are needed, engine timing, and how much fuel is needed for current vehicle traction. The P0858 trouble code only applies to vehicles that have an electronic traction control system. Some related trouble codes include P0856, P0857, P0859, and P0860.

What the P0858 code means

When the PCM, or a related module, doesn't receive input from the traction control module, a P0858 trouble code is stored and the check engine light illuminates. In some models, the traction control light might also illuminate and the transmission will be placed in Limp-in mode.

What causes the P0858 code?

A defective traction control ON/OFF switch is the most likely culprit behind the storage of a P0858 trouble code. Other causes can include damaged wiring or electrical connectors, corrosion in the sensor connector, and liquids spilled into the traction control switch.

What are the symptoms of the P0858 code?

Symptoms of a P0858 trouble code include the traction control system failing to operate, which is most obvious in slippery driving conditions. In addition to the warning lights, drivers can encounter problems when shifting gears and an increase in overall fuel usage while driving.

How does a mechanic diagnose the P0858 code?

To properly diagnose a P0858 trouble code, a mechanic needs an advanced scanner, digital volt/ohmmeter, a specialized scanner for testing the Controller Area Network (CAN) Bus harness, and a CAN Bus system wiring diagram. In addition, the mechanic should perform the following when diagnosing:

  • Inspect the wiring, connectors, and components. In particular, look for faulty, corroded, or damaged items during inspection.
  • Download any stored trouble codes or freeze frame data.
  • Install a memory-saving device and test the pins of the CAN Bus harness for wiring for fault using a specialized CAN Bus scanner. The mechanic should keep in mind that this process is time consuming and cost prohibitive.
  • Using a digital volt/ohmmeter, check the CAN Bus circuits, control modules, connectors, and fuses for fault.
  • When checking these components, connectors, and wiring, make sure to test for reference voltage and continuity with the battery ground.
  • Using the volt/ohmmeter, check the continuity and ground at the traction control ON/OFF switch.
  • Clear and retest the system to see if the problem returns.

Common mistakes when diagnosing the P0858 code

Mechanics most commonly cite the traction control module as being at fault, when in fact the problem lies with a faulty switch, circuit, or connector. Subsequent replacement of the traction control module does not fix the problem causing the P0858 trouble code and the code returns.

How serious is the P0858 code?

While a P0858 trouble code usually doesn't affect the operation of a vehicle with the code, it can lead to issues with gaining proper traction in slippery conditions. In addition, transmission issues in the form of shifting problems are commonly experienced with this code, as well as a decrease in the overall fuel efficiency of the vehicle.

What repairs can fix the P0858 code?

Fixing a P0858 trouble code requires the mechanic to complete the following repairs:

Need help with a P0858 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: Check engine light on

There area number of things that can cause a misfire such as low fuel pressure, vacuum leaks, faulty spark plugs or wires, a bad crankshaft position sensor, bad camshaft position sensor, faulty fuel injectors and many others. The most efficient...

Q: OBD sensor not reading scanner

This sounds like there is no power to the data bus network. This means that the OBD2 plug on your vehicle is not being powered by the battery. I would enlist the help of a qualified technician to find a wiring...

Q: My van won't start.. it's not the battery or the starter they are both brand new and I also had the starter relay changed ..

Hello and thank you for contacting YourMechanic. The code P1684 is for a battery disconnect from the battery to the computer system. The corrosion on the battery cable will block electrical current from traveling from the battery to the computer....