Internal Control Module Random Access Memory (RAM) Error

What it means

Random access memory (RAM) is the memory the engine computer (ECU) uses to hold temporary data while it runs. The computer's self-test found that this memory does not read or write data correctly. This is usually an internal fault, but poor power or grounds can also cause it.

Related codes: P0601P0605P0606P0603

Symptoms4

• Check engine light on.
• Sudden stalling or engine hesitation.
• Limp mode with reduced power.
• Hard starting or no start in some cases.

Possible causes5

• Internal memory failure in the engine computer.
• Low or unstable battery or charging voltage.
• Poor ground connections for the computer.
• Moisture inside the computer or its connectors.
• A software issue fixed by a manufacturer update.

How to diagnose5

1. Test the battery and charging system and confirm the voltage is stable.
2. Check power and grounds at the computer and measure voltage drop on them while running.
3. Inspect the computer and connectors for water or corrosion.
4. Clear the code and watch whether it returns immediately or later.
5. Look for a service bulletin or software update for this code.

How to fix5

1. Repair any battery or charging system problem.
2. Clean and tighten ground points and connectors.
3. Update the computer software if an approved update exists.
4. Replace and program the engine computer if the code returns with good power and grounds.
5. Clear the codes and confirm the code does not return.

Repair cost

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

The cost is low when a ground or battery is the cause, and reaches the upper end when the engine computer is 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