P2507Charging System

ECM/PCM Power Input Signal Low

The control module has detected that its power input signal is lower than expected. This usually points to voltage drop in the module power feed from a bad relay, corroded connection, or wiring fault.

🚗 Yes, in many cases, but have it checked soon. Low module power can cause stalling and intermittent no-start conditions.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Corroded or loose connection$40-$200

30%

Voltage drop at a connector or ground lowers the module supply.

#2Faulty main relay$40-$150

30%

The relay supplies low or unstable voltage to the module.

#3Low system or charging voltage$80-$700

20%

A weak charging system leaves the module underfed.

#4Wiring fault in power circuit$80-$300

20%

High resistance or a partial open in the feed.

🩺 Common Symptoms

Check engine light is on
Intermittent stalling
Hard starting
Erratic sensor or module behavior

💰 Repair Cost: DIY vs Shop

DIY Cost

$40-$300

Shop Cost

$120-$500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2507

1Measure the module power feed voltage under load and compare to battery voltage.

2Inspect and clean power and ground connections at the module.

3Test the main relay and its circuits.

4Repair the source of the voltage drop, then clear and retest.

❓ Frequently Asked Questions

What causes low module power?

Usually voltage drop from a corroded connection, a weak relay, or a low charging system.

Can it strand me?

It can if the module loses power and the engine stalls, so address it soon.

How do I test it?

Measure voltage at the module power pin under load and compare it to battery voltage to find the drop.

🔗 Related Codes

P2505P2500P2503P0562P0685