P2506 code meaning
ECM/PCM Power Input Signal Range/Performance
Powertrain system Generic code P25xx codes Check engine light
What P2506 means
P2506 is the plausibility variant: the supply reaching the engine module is electrically present but its value or behaviour does not fit the operating state. No passenger-car maker publishes how it detects this. The closest coded use is Deutz, whose EMR engine controller assigns P2506 with failure type 18 to a critical overcurrent in the ECU power supply, a reading that only makes sense as a performance check, not as a plain open or short. Ford lists P2506 with an M in the indicator column of its 2014 BOSS 302S code table. CARB requires makers to check input signals for rationality as comprehensive components. Clear low or high values belong to P2507 and P2508, dropouts to P2509. In practice the code points to supply wiring, relay or module.
P2506 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2506
- Check engine lamp (Ford lists it as MIL code)
- Sporadic stalling or restarts of the module possible
Common causes of P2506
- Most likelyResistance in supply fuse, relay contact or connector
- PossibleExcessive current drawn through the module supply (Deutz)
- Less likelyInternal supply monitoring of the module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Main relayPower distributionBattery cables
What each part of P2506 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. |
| 06 | The exact fault in that area. |
What to do next
- Note P2506 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 P2506
What does P2506 mean?
P2506 means "ECM/PCM Power Input Signal Range/Performance". P2506 is the plausibility variant: the supply reaching the engine module is electrically present but its value or behaviour does not fit the operating state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2506?
Drive gently and only to a workshop. With P2506 the car can go into limp mode (reduced power) to protect itself.
Will P2506 fail an emissions test?
Yes, it can. P2506 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 P2506 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2506 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.