Issues with PCM Relay on My Ford F150, Need Help!

Technical Discussions
1

I’ve been having some trouble with my Ford F150 lately, specifically related to the PCM (Powertrain Control Module) relay. It’s been acting up, and I’m not entirely sure what the best next steps are.

Symptoms I’ve Noticed:

  • Check Engine Light: The light keeps coming on and off.
  • Starting Issues: Sometimes it refuses to start unless I try turning the key multiple times.
  • Poor Engine Performance: It feels like it’s stuttering or hesitating when I accelerate.

Questions:

  1. What are some common causes for PCM relay failure?
  2. How do I check if the relay itself is the problem?
  3. Can anyone recommend good replacement parts?
  4. Any tips on installation or troubleshooting?

I’ve read a few forums about it, but I’m still confused. If anyone has faced similar issues or has advice, I’d really appreciate your input! Thanks in advance for any help you can provide!

2

I’ve had issues with my PCM relay too. Symptoms included that frustrating moment when it wouldn’t start at all! Sounds familiar?

3

Absolutely! I also noticed some weird warning lights popping up on the dashboard. It’s like the truck was trying to communicate something.

4

I’ve read that intermittent electrical issues are a telltale sign of PCM relay failure. You might experience strange power cuts while driving!

1 Like
5

For real! It’s unsettling. I wasn’t sure if it was just my truck acting up or a major problem. Did you find a solution?

6

Checking the PCM relay was my first move. I ended up replacing mine, and it fixed the starting issues right away. Definitely worth a try!

7

I had similar problems, and it turned out my connections were just dirty! Clean everything up before assuming you need a new relay.

8

That’s great advice! I might try that. Where exactly is the PCM relay located?

9

It’s usually near the fuse box under the hood. Just make sure to disconnect the battery first when you check it!

10

Awesome! I appreciate the tip. Just trying to find that ‘sweet spot’ where everything works perfectly again.

11

I’ve heard people say the PCM relay failures can sometimes be a sign of deeper issues. Anyone experienced that?

12

That’s true! I once had to deal with some serious wiring problems after a relay went. It’s something to be cautious about.

13

Don’t forget to check for any blown fuses while you’re at it. It’s like a treasure hunt under the hood!

14

Haha! I love that analogy! I hope my ‘hunt’ leads to a quick fix without any hidden traps.

15

Replacing the PCM relay on your Ford F150 can be straightforward! Start by gathering tools: a screwdriver set, wrench set, and a multimeter. You’ll need a new PCM relay as well. Make sure to disconnect the battery before starting!

16

Thanks for the tips! Is there a specific brand of PCM relay you recommend? I’d like to get a reliable one.

17

I usually recommend getting a Motorcraft PCM relay for the best compatibility and reliability. Also, don’t forget to wear gloves to protect your hands from sharp edges!

3 Likes
18

Good call on the gloves! How about the installation process? Is there anything specific I should watch out for?

19

Make sure to take a picture of the wiring before disconnecting anything. This can save you a lot of confusion when reconnecting everything. Also, ensure the new relay clicks into place firmly!

20

Excellent advice! I always forget to do that. Any other tips for avoiding errors?