Error code

OBD2 P0602

OBD2P0602
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Control Module Programming Error.

Severity

moderateCan drive, but may experience drivability issues such as entering 'limp-home' mode.

Summary

P0602 indicates an Engine Control Module (ECM) programming error, meaning the ECM's memory does not match what is expected or has been compromised.

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Potential drivability issues such as entering 'limp-home' mode

Common Causes

  • New ECM installed without proper programming
  • Wrong ECM installed for the vehicle
  • Tampered or modified ECM programming
  • Faulty ECM

Diagnosis

  1. Clear codes and restart the vehicle
  2. Check battery voltage and connections
  3. Verify proper installation of any replaced ECM or modules

Fixes

  • Reprogram the ECM using a factory scan tool

FAQ

Can I drive with P0602?

You can drive, but you may experience drivability issues such as entering 'limp-home' mode.

What causes P0602?

Common causes include a new ECM installed without proper programming, wrong ECM installed for the vehicle, tampered or modified ECM programming, and faulty ECM.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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