P2552 code meaning
Throttle/Fuel Inhibit A Circuit
What P2552 means
P2552 is the general circuit fault of throttle/fuel inhibit A, a line over which the engine module can be told, or can itself command, that throttle opening or fuelling must be blocked. It acts as a safety path next to the normal pedal-to-throttle chain. Ford lists P2552 in the engine module code table of its 2014 BOSS 302S race car, worded as circuit/open; its lamp column stays empty, and Ford gives no thresholds. A 2005 GM diagnostic summary for the L66 3.5-litre V6 shows how such a line is monitored, though only with the narrower codes P2553 to P2555, which test the inhibit relay and the voltage on the inhibit circuit after ignition off. If the path is broken, the module may limit power to stay safe. P2553 is the plausibility fault, P2554 and P2555 low and high.
P2552 at a glance
- Check engine lightUsually not
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2552
- Usually no check engine light (Ford non-MIL)
- Possible power limitation or no throttle response
Common causes of P2552
- Most likelyInhibit line open, e.g. broken wire or pushed-out pin
- PossibleInhibit relay or its supply defective
- Less likelyEngine module input or output stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Throttle inhibit aWiring harness
What each part of P2552 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 52 | The exact fault in that area. |
What to do next
- Note P2552 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2552
What does P2552 mean?
P2552 means "Throttle/Fuel Inhibit A Circuit". P2552 is the general circuit fault of throttle/fuel inhibit A, a line over which the engine module can be told, or can itself command, that throttle opening or fuelling must be blocked. It is a generic code, so it means the same on every make.
Is it safe to drive with P2552?
Drive gently and only to a workshop. With P2552 the car can go into limp mode (reduced power) to protect itself.
Will P2552 fail an emissions test?
Yes, it can. P2552 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2552 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2552 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.