Illuminates once the system has actually detected a powertrain or one all-wheel journey fault. Call an authorized dealer as soon as possible.

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This article uses to the Ford F-Series (2004-Present).

Today’s vehicles are really sophisticated. They have the right to warn united state in advance of potential problems. The an ext sophisticated vehicles become, the much more systems they have actually that have the right to potentially fail. By gift alerted v a warning light, you may avoid a breakdown or potential system failure. Many of the time the warning does not result in a costly repair or a major problem. The problem can it is in as basic as a leak in your windshield seal. It doesn"t average you have to spend a most time and also money seeking a diagnosis. In this article, we deal with the yellow wrench warning light, how to diagnose what is going on with your truck, and also the measures you can take to fix it.

What go the Yellow Wrench irradiate Mean?

The wrench irradiate in the Ford F-Series trucks is very comparable to a examine engine light. As soon as the wrench light comes on the vehicle may go automatically into limp mode, which boundaries the capability of the engine and transmission in stimulate to reduce mechanical anxiety on the possible failing components. The wrench light will come on due to low voltage in your system, low boost, abnormal temperature differences in between the block and also cylinder head, or faulty oil cooler. Many of the moment it"s connected with some type of maintain that demands to be done on her truck. Other times it have the right to signal a powertrain or one all-wheel-drive fault. The wrench irradiate will cause fault codes in the computer system memory which you or a technician deserve to retrieve to further diagnose the issue.

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Step 1 - usage a password Scanner come Detect Problem

If you have actually an OBD2 Scan tool, use it to identify what password come up. If friend don"t have actually a scanner and don"t desire to spend any type of coin to gain one, you will must visit your neighborhood Ford business center or another automotive shop such as Pep boys or Autozone to operation a diagnostic test. If a code comes up, climate you can resolve the concern head-on. Some Ford van owners have reported that no password come up at all and also that the wrench irradiate is a "ghost." This is no unheard of, however that doesn"t average you room in the clear. If you carry out not get any codes after to run a diagnostic scan, continue to the following steps.


Pro Tip:

If you obtain a warning light, take her truck in before you possibly gain stranded. Never, never ever clear codes.


Step 2 - check Powertrain control Module

If you find that your engine is stalling or misfiring, failing to start, or suffering bad fuel economy, it"s quite feasible that you could have a poor or failing Engine regulate Module (ECM) or Powertrain regulate Module (PCM). The PCM serves together the main computer system for countless of your truck"s engine performance and drivability functions. The takes the info gleaned native the engine"s miscellaneous sensors and uses that details to calculate and also tune engine spark and also fuel for maximum power and also efficiency. When checking the PCM, watch for problems with the wiring and also connectors. The wires must be completely insulated there is no breaks. The connectors must be clean v no bending pins or connector blades. Inspect for water damage. If water has obtained into her PCM the can brief circuit or collection up irreversible corrosion. Thermal stress and also vibration can type microcracks in circuit board (which space repairable).

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Figure 1. If you determine that the PCM requirements replacing, relocate onto step 3. If that looks fine, move onto step 4.

Step 3 - change the PCM

Replacing a PCM is basically a issue of swapping boxes. Availability can be a problem on part vehicles since the PCM is often hidden under or behind other materials in the instrument panel, climate regulate system or console. Some are situated under a seat and require removing the seat.

If you are planning to execute the work-related yourself, please follow the procedures in just how to replace Power manage Module. The cost to change your PCM can be anywhere between $400 and $1,500.

If instead of the PCM solves her problem, congratulations. But if the yellow wrench light comes ago on after ~ the install, move on to action 4.

Step 4 - inspect Electronic accelerator Body

Check the Throttle place Sensor (TPS) and also Electronic throttle Body (ETB). It could be that it"s stuck open or demands a thorough cleaning. First, friend will need to find it. Because that the F-Series trucks, you can find it behind the waiting box. Pull off the wait intake snorkel. Friend will must remove one bolt. Then blow dirt off the whole area to prevent dirt native falling into the engine. Release the MAF sensor, i m sorry is associated to the air box housing. Remove the 4 bolts holding the air crate down. Once the airbox is removed, girlfriend will have the ability to see the ETB (in white, below)

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Purchase a can of seafoam (under $10 at any auto parts store) and also clean the accelerator body without removing it. If the trouble persists, inspect the inlet hose, which might be cracked and also leaking. If every little thing looks fine, move on come the following step.

For more information, ~ above How to test a TPS, please read this subject in the rewildtv.com forum.For much more information ~ above How come Clean her Throttle Body, please read this article.

Step 5 - change Transmission Fluid

It"s a lengthy shot, yet it can work. It has actually for some. Just be certain you use the encourage transmission liquid which you can discover in your individuals Manual. However, if you room still see yellow wrenches on her dash console, it"s time to move onto step 5.For step-by-step accuse on How to change Your infection Fluid, you re welcome click here.

Step 6 - change the ETB

Since the electronic Throttle body is currently exposed, monitor these procedures to remove and also replace it through a brand-new one:Related Thread: electronic Throttle human body ReplacementRelated Video: Ford F150 F250 5.4L 3v electronic Throttle body Replacement


Pro Tip

If you have critical professional tip or vital piece of info that will aid the do-it-yourselfer understand or endure this experience, then add it right here in 1 to 3 quick sentences.

See more: What Happens If You Cut Off Circulation In Your Finger, Circulation Checks


What if ns Don"t Act quick Enough and My van Won"t Start?

In part cases, her light could be going on and off intermittently over time. The finest solution, the course, is to carry it directly to your mechanic or dealership service center. One forum member suggested that he came down on the dealership only to discover that the organization center was closed. Together he left the dealership, his truck died. The wrench and battery lights were illuminated. He could not obtain the truck to rotate over. But he has a workaround for this:

Remove the keyOpen your doorClose her doorTry transforming the van on again

It seems to reset the system and the truck will certainly turn earlier on.