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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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22,491specific
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Code

P0604

Generic P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: Generic
Type: P — Powertrain
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
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

HUMMER P — Powertrain

Control Module Random Access Memory (RAM)

Brand: HUMMER
Type: P — Powertrain
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
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P0604

ISUZU P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: ISUZU
Type: P — Powertrain
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
Repair manuals

Manual library for ISUZU

86

Browse 86 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ISUZU

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0604

LAND ROVER P — Powertrain

Internal Control Module Memory Error

Brand: LAND ROVER
Type: P — Powertrain
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
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
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Code

P0604

MERCEDES-BENZ P — Powertrain

Internal Control Module Random Access Memory (RAM) Error

Brand: MERCEDES-BENZ
Type: P — Powertrain
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
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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Code

P0604

MITSUBISHI P — Powertrain

RAM fail

Brand: MITSUBISHI
Type: P — Powertrain
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
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0604

OPEL P — Powertrain

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

Brand: OPEL
Type: P — Powertrain
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

SEAT P — Powertrain

PCM RAM memory - fault

Brand: SEAT
Type: P — Powertrain
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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