Illuminates as soon as the system has detected a powertrain or an all-wheel drive 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 an extremely sophisticated. They have the right to warn united state in advance of potential problems. The much more sophisticated vehicles become, the an ext systems they have that have the right to potentially fail. By gift alerted v a warning light, you might avoid a break down or potential mechanism failure. Most of the time the warning walk not an outcome in a i have lot of money repair or a major problem. The difficulty can be as basic as a leak in your windshield seal. It doesn"t average you need to spend a the majority of time and money search a diagnosis. In this article, we deal with the yellow wrench warning light, exactly how to diagnose what is walking on with your truck, and also the procedures you can take to solve it.

What walk the Yellow Wrench irradiate Mean?

The wrench irradiate in the Ford F-Series trucks is very similar to a examine engine light. When the wrench light comes on the automobile may go instantly into limp mode, which boundaries the capabilities of the engine and also transmission in bespeak to minimize mechanical tension on the feasible failing components. The wrench light will certainly come on because of low voltage in her system, short boost, abnormal temperature differences between the block and also cylinder head, or faulty oil cooler. Most of the moment it"s linked with some kind of maintenance that requirements to be done on your truck. Various other times it deserve to signal a powertrain or an all-wheel-drive fault. The wrench light will trigger fault password in the computer memory which you or a technician have the right to retrieve to additional diagnose the issue.


Step 1 - usage a code Scanner come Detect Problem

If you have actually an OBD2 Scan tool, use it to recognize what codes come up. If you don"t have actually a scanner and also don"t desire to spend any coin to acquire one, you will need to visit your local Ford organization center or one more automotive shop such as Pep boys or Autozone to run a diagnostic test. If a code comes up, climate you can attend to the concern head-on. Some Ford truck owners have reported the no password come up in ~ all and also that the wrench irradiate is a "ghost." This is no unheard of, however that doesn"t mean you room in the clear. If you carry out not get any kind of codes after running a diagnostic scan, proceed to the next steps.

Pro Tip:

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

Step 2 - examine Powertrain control Module

If you find that her engine is stalling or misfiring, failing come start, or suffering poor fuel economy, it"s quite feasible that you can have a bad or failing Engine manage Module (ECM) or Powertrain control Module (PCM). The PCM serves as the main computer system for plenty of of her truck"s engine performance and drivability functions. It takes the details gleaned native the engine"s assorted sensors and uses that details to calculate and also tune engine spark and also fuel for maximum power and efficiency. Once checking the PCM, watch for problems with the wiring and also connectors. The wires must be fully insulated there is no breaks. The connectors should be clean through no bend pins or connector blades. Check for water damage. If water has acquired into her PCM it can short circuit or set up irreversible corrosion. Heat stress and also vibration can type microcracks in circuit board (which room repairable).

Figure 1. If you recognize that the PCM requirements replacing, move onto step 3. If it looks fine, move onto action 4.

Step 3 - replace the PCM

Replacing a PCM is basically a matter of swapping boxes. Accessibility can be a problem on some vehicles since the PCM is often buried under or behind other components in the instrument panel, climate manage system or console. Part are situated under a seat and also require removed the seat.

If you room planning to perform the work yourself, please follow the measures in just how to replace Power manage Module. The price to change your PCM can be anywhere between $400 and $1,500.

If replacing the PCM solves her problem, congratulations. Yet if the yellow wrench irradiate comes ago on ~ the install, move on to step 4.

Step 4 - inspect Electronic throttle Body

Check the Throttle position Sensor (TPS) and also Electronic accelerator Body (ETB). It might be that it"s stuck open or needs a thorough cleaning. First, girlfriend will require to situate it. For the F-Series trucks, girlfriend can uncover it behind the air box. Pull off the wait intake snorkel. Girlfriend will need to remove one bolt. Then punch dirt off the whole area to avoid dirt indigenous falling right into the engine. Relax the MAF sensor, i m sorry is connected to the air box housing. Remove the four bolts stop the air box down. As soon as the airbox is removed, girlfriend will be able to see the ETB (in white, below)

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

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

Step 5 - replace Transmission Fluid

It"s a long shot, but it might work. It has for some. Just be sure you usage the recommended transmission fluid which you can discover in your users Manual. However, if you room still seeing yellow wrenches on your dash console, it"s time to move onto action 5.For step-by-step instructions on How to readjust Your infection Fluid, please click here.

Step 6 - replace the ETB

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

Pro Tip

If friend have crucial professional reminder or an essential piece of info that will help the do-it-yourselfer know or make it through this experience, then include it right here in 1 to 3 brief sentences.

See more: 2003 Honda Civic Head Bolt Torque Specs, 2003 Civic Ex

What if i Don"t Act rapid Enough and My truck Won"t Start?

In some cases, your light can be walk on and off intermittently end time. The best solution, that course, is to lug it directly to her mechanic or dealership organization center. One forum member indicated that he landed on the dealership just to find that the service center to be closed. As he left the dealership, his truck died. The wrench and battery lights were illuminated. He might not obtain the van to revolve over. But he has actually a workaround because that this:

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

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