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P0602

Control Module Programming Error

The ECM has detected an error in its programmed calibration data.

SeverityCritical
CategoryElectrical
Est. Repair Cost$300-$1200
Code TypePowertrain
DIY RepairProfessional

⚡ Common Causes

  • ›Incomplete or corrupted software flash
  • ›Aftermarket tuning conflict
  • ›ECM hardware fault

⚠️ Symptoms

  • ›Check engine light
  • ›Possible erratic engine performance
  • ›May not start

✅ How to Fix — Step by Step

  • Step 1:Reflash ECM with correct calibration
  • Step 2:Remove any aftermarket tunes and reflash to stock
  • Step 3:Replace ECM if error persists

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0602 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: If an aftermarket performance tune was installed, reverting to stock calibration often clears this code.

Repair Cost Estimate

Full Repair Estimate
$300-$1200
DIY Possible?
PRO
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0602 mean?+
P0602 stands for Control Module Programming Error. The ECM has detected an error in its programmed calibration data.
What causes code P0602?+
Incomplete or corrupted software flash; Aftermarket tuning conflict; ECM hardware fault
How do I fix code P0602?+
Reflash ECM with correct calibration; Remove any aftermarket tunes and reflash to stock; Replace ECM if error persists
How much does it cost to fix P0602?+
Estimated repair cost for P0602 is $300-$1200.
Is P0602 DIY-friendly?+
P0602 typically requires professional equipment and a qualified mechanic.

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Related Codes

P0606PCM Processor Fault
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P0601Internal Control Module Memory Check Sum Error
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P0603Internal Control Module Keep Alive Memory Error
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P0604Internal Control Module Random Access Memory Error
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P0605Internal Control Module Read Only Memory Error
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P0607Control Module Performance
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