Can a bad battery cause electrical codes?

Yes, a weak or failing battery can cause voltage drops that affect various modules and sensors, potentially triggering multiple codes. Always check battery health and charging system first.

How much do electrical repairs cost?

Electrical repairs range from $75 for a simple connector fix to $400+ for wiring harness repairs or module replacements. ECM/PCM replacement can cost $500-$1,500 including programming.

P0601

Internal Control Module Memory Check Sum Error

Criticalelectrical

Overview

The P0601 code indicates an internal control module memory check sum error fault has been detected in the vehicle's electrical system. This code relates to the internal control module, charging system, or starter circuit. Electrical issues at the PCM level can cause widespread vehicle operation problems and should be diagnosed thoroughly.

Symptoms

Multiple warning lights on dashboard
Vehicle not starting or cranking slowly
Check Engine Light (MIL) illuminated
Intermittent electrical failures

Common Causes

Faulty engine control module (ECM/PCM)
Corroded or damaged wiring connectors
Water damage to electrical connectors
Short or open circuit in wiring

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Check battery voltage and charging system output with a multimeter
3Inspect wiring and connectors related to the trouble code
4Test circuit voltage, ground, and resistance with a multimeter
5Check related fuses and relays

Estimated Repair Cost

$75 — $400

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Chevrolet SilveradoToyota CamryMercedes-Benz C-ClassFord Ranger

Related Codes

P0335 P0560 P0562

More Electrical Codes

B0001Driver Frontal Airbag Deployment Loop Circuit Open

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B0002Driver Frontal Airbag Deployment Loop Circuit Short to Ground

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B0003Driver Frontal Airbag Deployment Loop Circuit Short to Battery

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B0004Driver Frontal Airbag Deployment Loop Resistance Too High

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B0005Driver Frontal Airbag Deployment Loop Resistance Too Low

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B0006Passenger Frontal Airbag Deployment Loop Circuit Open

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Frequently Asked Questions

Electrical codes can be challenging because they often involve intermittent issues. A thorough inspection of wiring, connectors, and grounds with a multimeter is essential for accurate diagnosis.