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Home / DTC / P0604 — Internal Control Module Random Access Memory (RAM) Error

P0604 — Internal Control Module Random Access Memory (RAM) Error

Detailed page for trouble code P0604.

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Code

P0604

Generic P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 24 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
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Code

P0604

GWM P — Powertrain

- Error in the memory (RAM) of the control unit

Brand: GWM
Type: P — Powertrain
Views: UK: 2 EN: 2 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0604

HUMMER P — Powertrain

Control Module Random Access Memory (RAM)

Brand: HUMMER
Type: P — Powertrain
Views: UK: 5 EN: 12 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0604

ISUZU P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: ISUZU
Type: P — Powertrain
Views: UK: 10 EN: 18 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
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Code

P0604

LAND ROVER P — Powertrain

Internal Control Module Memory Error

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 2 EN: 6 RU: 2
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Buy

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Buy
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Code

P0604

MERCEDES-BENZ P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: MERCEDES-BENZ
Type: P — Powertrain
Views: UK: 8 EN: 11 RU: 10
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0604

MITSUBISHI P — Powertrain

RAM fail

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 6 EN: 8 RU: 6
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0604

OPEL P — Powertrain

Electronic Control Unit (ECU) Fault - Random Access Memory (RAM)

Brand: OPEL
Type: P — Powertrain
Views: UK: 4 EN: 8 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0604

SEAT P — Powertrain

PCM RAM memory - fault

Brand: SEAT
Type: P — Powertrain
Views: UK: 0 EN: 2 RU: 1
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or low battery/charging system voltage (power interruptions during write)
  • Corroded, loose, or damaged power/ground connections to the control module
  • Software corruption or failed calibration update
  • Failed or degraded memory IC or module hardware (solder joint, internal component)
  • Water intrusion, contamination, or physical damage to the module
  • Electrostatic discharge (ESD) event or electrical surge from aftermarket equipment

Symptoms

  • MIL (Check Engine Light) illuminated
  • Intermittent driveability issues (stalling, rough idle) or no-start
  • Loss of communication with the affected control module on scan tool
  • Random or incorrect sensor/actuator behavior
  • Multiple unrelated stored diagnostic trouble codes

What to check

  • Retrieve freeze frame and full code list with a capable scan tool; note related codes
  • Check battery state of charge and charging system voltage (key on, engine running)
  • Visually inspect module connectors and wiring for corrosion, bent pins, damage, or water
  • Verify good chassis and engine grounds and power feeds to the module
  • Attempt communication with the module; note intermittent connect/disconnect
  • Check fuses and relays supplying the module

Signal parameters

  • Battery voltage at module (Key ON, Engine RUN) — expected ~11.5–14.8 V
  • Ground resistance/continuity to module chassis ground
  • CAN/LIN bus Tx/Rx activity and error counts (communication presence)
  • Module self-test or diagnostic status flags (memory test pass/fail)
  • Freeze frame parameters at time of fault (engine speed, ignition status)
  • Module software part number and calibration ID (for reflash checks)

Diagnostic algorithm

  1. Connect a manufacturer-level or capable scan tool. Record P0604 and any related codes and freeze-frame data.
  2. Check battery voltage and charging system. If battery is weak, charge or replace before further testing.
  3. Inspect all power and ground connections to the affected module; clean and tighten terminals. Repair damaged wiring/connectors.
  4. Clear codes and attempt to reproduce. If the code does not return, monitor vehicle for intermittent faults.
  5. If code returns, check module communication on CAN/LIN buses. Diagnose any bus wiring or other module faults found.
  6. If wiring/power/grounds are good, check service bulletins for software updates. Reflash or update module software per manufacturer procedure.
  7. If reflash fails or code persists after a successful reflash, perform module bench or dealer-level diagnostics to test internal memory/hardware.
  8. If module hardware is confirmed faulty, replace the control module and program/configure with correct VIN/calibrations. Re-test and clear codes.
  9. After repair, verify no related codes remain and perform a road test to confirm normal operation.

Likely causes

  • Battery disconnected or vehicle jump-started while module was writing
  • Weak battery or charging system causing voltage dips
  • Corroded ground/connector pins at the module
  • Failed module memory chip or internal processor fault
  • Recent software reflash that failed or became interrupted
  • Aftermarket alarm, charger, or remote start interfering with module power

Fault status

⚠️ Status
Internal control module RAM error detected — memory corruption or failure inside the module. Could be caused by power interruption, software corruption, connector/ground issues, or module hardware failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

P0600 P0601 P0602 P0603 P0605
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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