◆OBD Codes

P0606

PCM Processor Fault

Criticalelectrical

Overview

The P0606 code indicates an pcm processor fault 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

  • Check Engine Light (MIL) illuminated
  • Multiple warning lights on dashboard
  • Intermittent electrical failures
  • Vehicle going into limp mode or reduced power

Common Causes

  • Faulty engine control module (ECM/PCM)
  • Short or open circuit in wiring
  • Faulty alternator/generator
  • Low battery voltage or failing battery

Diagnosis Steps

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

Ram 1500Toyota TundraToyota TacomaMercedes-Benz C-Class

Related Codes

P0562P0600P0120

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.