Code
P0601
MERCEDES-BENZ
P — Powertrain
Internal Control Module Memory Check Sum Error
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UK: 24
EN: 37
RU: 37
AI status
Completed
Completed
100%
Causes
- Corrupted module firmware or calibration data
- Failed or degrading internal non-volatile memory (EEPROM/ROM)
- Interrupted or incomplete ECU reprogramming/update
- Low or unstable battery voltage during programming
- Poor power or ground connections to the control module
- Water ingress or physical damage to the module
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Related communication errors with the affected control module (CAN/UDS faults)
- Vehicle may enter limp mode or fail to start in severe cases
- Stored supplemental diagnostic trouble codes for communication or memory issues
- Intermittent or permanent loss of features controlled by the affected ECU
What to check
- Read and record all stored DTCs and freeze frame data with a capable diagnostic tool (OEM-level recommended)
- Check vehicle battery state-of-charge and resting voltage; check battery terminals for corrosion/tightness
- Inspect power and ground connections at the affected module for corrosion, loose pins, or damaged wiring
- Check for signs of water ingress, physical damage, or overheating at the module
- Confirm recent service history: was the module previously programmed or replaced?
- Attempt to communicate with the control module using OEM diagnostic tool to read software/part numbers and internal status
Signal parameters
- Module software part number and calibration ID (e.g., SW/HW versions)
- Checksum or CRC value reported by the diagnostic tool (if available)
- Battery voltage during communication and while trying to reflash (should be >12.4 V and stable)
- Communication status on the bus (CAN/LIN) and message rates
- Diagnostic session status (UDS/SERVICES) and error counters
Diagnostic algorithm
- Connect a quality scan tool (OEM/Xentry/Star/compatible) and retrieve all stored codes and freeze frame data; save a report.
- Verify battery condition: charge if necessary and ensure resting voltage >12.4 V; use a battery support/charger during diagnostics and programming.
- Inspect and secure all power and ground connections to the affected control module; repair any damaged wiring or corroded terminals.
- Visually inspect the module for water damage, burns, or physical defects; if found, consider module replacement.
- Confirm the module's software and calibration part numbers; check manufacturer service bulletins for known software issues or recall updates.
- Attempt to read internal memory and checksum values with OEM tools; if the tool indicates corrupted memory, attempt a reflash/reprogram using the correct, vehicle-specific calibration file.
- If reprogramming fails or the checksum error returns after a successful flash, perform a controlled power/ground load test and re-attempt programming with battery support.
- If multiple reflash attempts and wiring checks do not clear the fault, replace the control module with a genuine or manufacturer-approved unit and perform coding and adaptation as required.
- After repair or reprogramming, erase codes, perform relearn/coding procedures, and road-test to confirm the fault does not return.
- If issue persists, escalate to manufacturer support or a specialist with bench-level ECU diagnostic and repair capability.
Likely causes
- Battery was weak or disconnected during recent software update
- Previous attempt to flash or update module failed or was aborted
- Intermittent power/ground causing memory corruption
- Module exposed to moisture or impact leading to internal failure
- Wrong calibration file loaded (VIN mismatch or incorrect model)
Fault status
Status
Internal Control Module Memory Check Sum Error — module detected invalid/corrupted internal memory contents or firmware checksum mismatch. Stored when program/data integrity check fails.
Repair difficulty: Hard
Diagnostic time: 1.5-4.0 hours
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