OBD Guide
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P0602

Control Module Programming Error

P0602 is an OBD-II diagnostic trouble code meaning: Control Module Programming Error. Common causes: installing a new ecu without programming, installing a used ecu with incompatible firmware. Estimated repair cost: $56–333.

Severity
🚨 Critical
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–333 (est.)

Symptoms

  • The engine does not start (new ECU without program)
  • Emergency mode with severe power limitations
  • Check Engine Light Is On
  • All ECU-controlled systems do not work correctly
  • The immobilizer may prevent starting

Causes

  • Installing a new ECU without programming
  • Installing a used ECU with incompatible firmware
  • Unsuccessful (interrupted) ECU flashing
  • Removing software when attempting chip tuning
  • Software version incompatibility

How to Fix

  1. Make sure that the ECU matches the specific model and year of the vehicle
  2. Contact an authorized dealer or specialized service for ECU programming
  3. Program the ECU with the manufacturer's official software
  4. Adapt the immobilizer (VIN code, keys)
  5. Carry out all necessary adaptation procedures after programming
  6. Check for error codes after programming

Related codes

P0600P0601P0603P0604P0605

Error P0602 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0602 code mean?

P0602 is an OBD-II diagnostic trouble code that indicates: Control Module Programming Error

What causes a P0602 error code?

The most common causes of P0602 include: Installing a new ECU without programming; Installing a used ECU with incompatible firmware; Unsuccessful (interrupted) ECU flashing; Removing software when attempting chip tuning.

How do I fix a P0602 diagnostic trouble code?

To fix P0602: Make sure that the ECU matches the specific model and year of the vehicle. Contact an authorized dealer or specialized service for ECU programming. Program the ECU with the manufacturer's official software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0602?

Yes, but get it checked soon

How much does it cost to fix P0602?

The estimated repair cost for P0602 is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat