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P2508 Charging System
ECM/PCM Power Input Signal Range/Performance
The control module has detected that a power input signal, often a secondary or ignition-referenced feed, is out of the expected range. This indicates a wiring, relay, or switch problem affecting module power.
🚗 Yes, in many cases, but have it checked soon. Unstable module power can cause stalling and no-start conditions.
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🎯 Top Causes, Ranked by Likelihood
#1 Ignition switch fault $100-$350
A failing switch supplies erratic power to the module.
#2 Corroded or loose connection $40-$200
A poor connection varies the module supply voltage.
#3 Faulty relay $40-$150
A relay supplies unstable voltage to the module.
#4 Wiring fault $80-$300
High resistance or an intermittent open in the feed.
🩺 Common Symptoms Check engine light is on Intermittent stalling Hard starting or no-start Erratic gauge or accessory behavior 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2508 1 Identify the affected power feed and measure it under load.
2 Inspect the ignition switch, relay, and connectors.
3 Check the wiring for high resistance or intermittent opens.
4 Repair the faulty component, then clear and retest.
❓ Frequently Asked Questions How is this different from P2505?
It refers to a power input performance issue, often on a different feed, but the diagnosis is similar.
Can it strand me?
It can if the module loses stable power, so address it soon.
Where do I start?
Check the ignition switch, relay, and power connections under load.
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