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

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

Today’s vehicles are an extremely sophisticated. They deserve to warn us in advance of potential problems. The more sophisticated vehicles become, the an ext systems they have actually that can potentially fail. By gift alerted through a warning light, you may avoid a breakdown or potential device failure. Most of the time the warning go not result in a costly repair or a serious problem. The difficulty can it is in as basic as a leak in your windshield seal. That doesn\"t median you need to spend a lot of time and money seek a diagnosis. In this article, we attend to the yellow wrench warning light, exactly how to diagnose what is going on v your truck, and the procedures you have the right to take to settle it.

What does the Yellow Wrench irradiate Mean?

The wrench light in the Ford F-Series van is very comparable to a inspect engine light. When the wrench light comes on the auto may go automatically into limp mode, which boundaries the ability of the engine and transmission in stimulate to reduce mechanical stress on the feasible failing components. The wrench light will certainly come on as result of low voltage in her system, short boost, abnormal temperature differences between the block and also cylinder head, or faulty oil cooler. Many of the time it\"s connected with some sort of maintenance that demands to be excellent on your truck. Other times it have the right to signal a powertrain or an all-wheel-drive fault. The wrench irradiate will trigger fault codes in the computer system memory which friend or a technician deserve to retrieve to additional diagnose the issue.


Step 1 - use a password Scanner come Detect Problem

If you have an OBD2 Scan tool, use it to recognize what password come up. If friend don\"t have actually a scanner and also don\"t want to spend any type of coin to acquire one, girlfriend will should visit your local Ford company center or one more automotive shop such as Pep guys or Autozone to run a diagnostic test. If a password comes up, climate you can address the worry head-on. Some Ford van owners have reported the no password come up at all and also that the wrench light is a \"ghost.\" This is not unheard of, but that doesn\"t median you room in the clear. If you carry out not get any kind of codes after to run a diagnostic scan, proceed to the next steps.

Pro Tip:

If you obtain a warning light, take your truck in prior to you possibly get stranded. Never, never clear codes.

Step 2 - inspect Powertrain control Module

If you uncover that your engine is stalling or misfiring, failing to start, or suffering bad fuel economy, it\"s quite possible that you could have a bad or failing Engine manage Module (ECM) or Powertrain regulate Module (PCM). The PCM serves together the main computer system for many of your truck\"s engine performance and also drivability functions. That takes the details gleaned from the engine\"s assorted sensors and uses that details to calculate and also tune engine spark and fuel for maximum power and efficiency. When checking the PCM, look at for difficulties with the wiring and connectors. The wires have to be completely insulated without breaks. The connectors need to be clean v no bending pins or connector blades. Inspect for water damage. If water has acquired into your PCM that can brief circuit or collection up irreversible corrosion. Thermal stress and also vibration can kind microcracks in circuit plank (which space repairable).

Figure 1. If you identify that the PCM demands replacing, move onto action 3. If that looks fine, relocate onto action 4.

Step 3 - replace the PCM

Replacing a PCM is basically a issue of swapping boxes. Availability can be a difficulty on part vehicles due to the fact that the PCM is often hidden under or behind other materials in the tool panel, climate regulate system or console. Part are situated under a seat and also require removing the seat.

If you space planning to perform the work yourself, you re welcome follow the steps in just how to replace Power regulate Module. The cost to replace your PCM have the right to be anywhere in between $400 and also $1,500.

If replacing the PCM solves your problem, congratulations. But if the yellow wrench light comes back on after the install, relocate on to step 4.

Step 4 - examine Electronic throttle Body

Check the Throttle place Sensor (TPS) and Electronic accelerator Body (ETB). It could be that it\"s stuck open up or needs a thoroughly cleaning. First, friend will need to situate it. For the F-Series trucks, you can find it behind the air box. Pull off the air intake snorkel. You will need to remove one bolt. Then punch dirt off the entire area to prevent dirt indigenous falling right into the engine. Relax the MAF sensor, i m sorry is linked to the air box housing. Eliminate the 4 bolts stop the air crate down. When the airbox is removed, you will be able to see the ETB (in white, below)

Purchase a have the right to of seafoam (under $10 at any type of auto parts store) and clean the throttle body there is no removing it. If the trouble persists, inspect the inlet hose, which can be cracked and also leaking. If every little thing looks fine, relocate on come the following step.

For an ext information, on How to test a TPS, please read this subject in the forum.For much more information top top How to Clean your Throttle Body, please review this article.

Step 5 - replace Transmission Fluid

It\"s a lengthy shot, however it can work. It has actually for some. Just be certain you usage the encourage transmission liquid which friend can uncover in your users Manual. However, if you space still see yellow wrenches on your dash console, it\"s time to move onto step 5.For step-by-step instructions on How to change Your transmission Fluid, you re welcome click here.

Step 6 - replace the ETB

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

Pro Tip

If girlfriend have critical professional guideline or crucial piece of info that will assist the do-it-yourselfer know or survive this experience, then add it below in 1 to 3 quick sentences.

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

In part cases, your light might be going on and also off intermittently end time. The finest solution, that course, is to lug it straight to your mechanic or dealership service center. One forum member shown that he arrived on the dealership just to discover that the organization center to be closed. Together he left the dealership, his truck died. The wrench and also battery lights were illuminated. He can not get the truck to turn over. Yet he has actually a workaround for this:

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

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