Why does my car go into limp mode after warming up?
Oil on the ECM plugs can cause a vehicle to repeatedly drop into limp mode a few minutes after warming up while throwing code P1125. This restricts speed to around four miles per hour, leaving drivers uncertain if it is safe to drive to a garage without risking engine damage.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 13.9× more often in r/AskMechanics than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1replacing throttle body with an oem used oneDid this help you?
- 2driving slowly with low RPM to a nearby garageDid this help you?
- 3towing the vehicleDid this help you?
- 4Checking engine codesDid this help you?
- 5Inspecting oil levelsDid this help you?
- 6Checking specific components like timing chains and intake manifold runnersDid this help you?
- 7Turning the car off for 5 to 10 minutes to reset the limp mode temporarilyDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Found this oil like substance (no strong oodor smell) on the ecm plugs(mainly on the right side plugs was more wet then the left side plugs). car works fine but goes into limp mode every-time after warm up around 5-3minutes it was driving fine for 2 weeks before encountering this problem. What do i do its throwing p1125.”source ↗
“when I sometimes accelerate fast to overtake, the car suddenly just goes “limp” and completely stops accelerating, RPM won’t go past 2.1k and I’m forced to backing up (life risk obviously for me and other drivers).”source ↗
“I have a 2007 f150 lariat 233k miles Changed the starter and battery Saturday then the spark plugs on Sunday morning. Everything was fine I took the kids to school Monday and on the way home it went into limp mode and these are the codes.”source ↗
“is it safe to drive to my garage 4 mins away at normal speed but car is stuck in limp mode. Don't want to do any engine damage”source ↗
“just wasn't sure about driving it as it's going like 4 miles an hour in limp mode”source ↗
Where this came up
People with this problem also raised
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- 2Engine RPM drops right after starting unless I give it gas
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- 24Why does my car lose power when I step on the gas?