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P0602

Control Module Programming Error

Car Fault Codes Engine computer & electrical

Severity Medium Do not ignore it; it may get worse and cost more.
Can you still drive? With care, short trips only
Who can fix it? Needs a specialist or dealer
Typical repair time 1 hour – 4 hours
Typical cost SAR 200 to 5,000

What it means

This code means the engine computer (ECU) is not programmed, or its programming is incomplete or does not match the vehicle. It usually appears after a new or used computer is installed, or after a software update that did not finish.

Related codes: P0601P0630P0606P0603

Symptoms4

  • Check engine light on.
  • No start, or the engine starts and then stalls.
  • Poor performance or abnormal shifting.
  • Some data missing on the scan tool.

Possible causes5

  • A new or used computer installed without being programmed to the vehicle.
  • Programming interrupted by a weak battery or a disconnected programming tool.
  • Software loaded that does not match the model or engine.
  • Non-original modification of the computer software.
  • Internal computer fault that prevents saving the programming (less common).

How to diagnose5

  1. Check whether the computer was recently replaced or programmed.
  2. Read the part number and software version with a scan tool and compare them with what fits the VIN.
  3. Check that battery voltage is healthy and stable before any programming attempt.
  4. Confirm good power and ground connections at the computer.
  5. Consult the dealer or a programming specialist for the correct software.

How to fix5

  1. Connect a stable-voltage battery support charger during programming.
  2. Complete the programming with the correct software for the VIN.
  3. Return a tuned computer to its original software.
  4. Replace and program the computer if it will not accept programming.
  5. Clear the codes and confirm the code does not return and the vehicle runs normally.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is moderate when correct programming is enough, and rises sharply if the computer itself is faulty and must be replaced and programmed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

The code appeared after replacing the computer. What now?

A new or used computer usually needs full programming for the vehicle VIN. Installing it alone is not enough.

Can I program the computer at home?

It requires a programming tool, a manufacturer software subscription and a stable charger, so it is normally done by the dealer or a programming specialist.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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Related codes

P0601 Internal Control Module Memory Check Sum Error High Engine computer & electrical P0630 VIN Not Programmed or Incompatible - ECM/PCM Low Engine computer & electrical P0606 Control Module Processor High Engine computer & electrical P0603 Internal Control Module Keep Alive Memory (KAM) Error Low Engine computer & electrical P0562 System Voltage Low Medium Engine computer & electrical P0645 A/C Clutch Relay Control Circuit Low Engine computer & electrical