Workshop · diagnostics and repairsWe reply the same day
Diagno.ee
Engine computer and electrics

P2505 Control module power input: fault (engine)

By: · Updated:

P2505 means: Control module power input: fault (engine). The fault is in the control module's own memory, processor, supply or internal circuits. Drive gently and have the car checked soon. The most common repair costs about €120–220 in Estonia, depending on make and model. The most common cause: weak battery or unstable voltage.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Battery replacement€120–220parts and labour in Estonia, depending on make and model

What it means

The fault is in the control module's own memory, processor, supply or internal circuits. Often the real cause is a weak battery or a bad ground.

What you may notice

  • Engine light on
  • The car may go into limp mode
  • The engine may not start
  • Other modules may also log faults

What could be wrong

  1. 1Weak battery or unstable voltage · Battery replacement €120–220
  2. 2Bad ground or supply wire · Wiring or connector repair €45–90
  3. 3Faulty module software · Control unit check and software €150–300
  4. 4Internal module failure (moisture or age) · Control unit check and software €150–300

Repair difficulty: Hard

What you can check yourself

Check the battery and terminals before anything else. If the fault appeared after a battery change or jump start, clear it and see whether it returns. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

  1. We measure battery voltage and module supplies
  2. We check the grounds
  3. We update or reflash the software
  4. We repair or replace the module and code it

Standard SAE description: ECM/PCM Power Input Signal

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Loss of power or limp mode

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P2505 mean?

Control module power input: fault (engine). The fault is in the control module's own memory, processor, supply or internal circuits. Often the real cause is a weak battery or a bad ground.

Can I drive with code P2505?

Drive gently and have the car checked soon.

How much does it cost to fix P2505?

It depends on the cause: battery replacement €120–220; wiring or connector repair €45–90; control unit check and software €150–300. Prices include labour at €45/h, depending on make and model.

How is P2505 fixed?

We measure battery voltage and module supplies. We check the grounds. We update or reflash the software. We repair or replace the module and code it.

Related codes

P2506Control module power input: reading or operation not right (engine)P2504Battery voltage and charging: signal or voltage too highP0603Engine computer lost its learned valuesP0604Control module: internal memory or software fault (RAM)P0605Control module: internal memory or software fault (ROM)B1600PATS: key transponder signal not received

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

Book a diagnostic check