P0603 | p0603 internal control module comm error | code p0603 | p0603 obd2 | dtc p0603
Автор: IG Garage
Загружено: 2025-09-06
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P0603 | p0603 internal control module comm error | code p0603 | p0603 obd2 | dtc p0603
Hello friends welcome to the ig garage channel today I am telling you how to fix p0603 internal control module comm error so watch this video and learn how to fix it friends if you like this video then subscribe to the ig garage channel for more videos.
The P0603 code indicates that the Engine Control Module (ECM/PCM) has detected an error with its Keep Alive Memory (KAM). The KAM stores important adaptive data like fuel trims, idle settings, and transmission shift points, even when the ignition is off. If this memory is corrupted or loses power, the ECM cannot retain learned values.
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⚠ Symptoms:
Check Engine Light ON
Hard starting or no start condition
Rough idle or stalling
Poor acceleration or hesitation
Transmission shifting issues
Reduced fuel economy
🔍 Causes:
Weak or disconnected battery
Faulty or unstable alternator/charging system
Loose or corroded ECM power/ground connections
Faulty wiring harness or damaged connectors
Aftermarket ECU tuning or failed reprogramming
Defective ECM/PCM
🛠 Fixes:
Check and clean battery terminals & ground connections
Test alternator and charging system
Inspect wiring harness to ECM/PCM for damage
Reprogram/update ECM software
Replace ECM/PCM if fault persists
📍 Location:
The ECM/PCM is usually located in the engine bay (near fuse box or firewall) or under the dashboard depending on the vehicle.
💰 Repair Cost:
Battery/alternator service: $100 – $400
Wiring/connection repair: $50 – $200
ECM reprogramming: $100 – $300
ECM replacement: $500 – $1200+
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#P0603 #ECM #KeepAliveMemory #CheckEngineLight #OBD2Codes #IGGarage
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