BMW ECUs
The ECU Pro offers specialized ECU repair services for BMW ECUs, covering a wide range of models to restore optimal functionality in your vehicle. We handle ECUs such as the M5.2, ME7.2, ME9.2, MEV9.2, MEVD17.2 (and various sub-models), MS41, MS42, MS43, MS45, MSD80, MSD85.0, MSD85.1, MSD85.3, MSS50, MSS54, and MSV70. Each ECU repair undergoes thorough testing in real BMW vehicles to ensure peak performance and dependability.
Dedicated support team
Tested in real BMW vehicles
Carlos Ricardo
Very professional
Sioux Falls, United States, 14 hours ago
4.87 average rating from 2903 reviews
M5.2
- Engine temp gauge in red
- DME / ECU internal errors
- Water damage
- DME / EWS Related codes
ME7.2
- DME / EWS Related codes
- Engine temp gauge in red
- No ECU function or communication with the ECU
- Water damage
- DME RAM self-test checksum errors
- Throttle errors on vehicle
ME9.2
- No ECU function or communication
- Intermitted failure of various components (e.g. throttle)
- Intermitted ECU Failure
- Engine misfire
MEV9.2
- No ECU function or communication with the ECU
- Cylinder burning time too short
- Ignition circuit misfire cylinder
- BSD line communication fault
- Water damaged DME
- Valvetronic failure
MEVD17.2 - N55 Engine
- No ECU function or communication with the ECU
- Valvetronic failure
- Cylinder burning time too short
- No ignition spark on one cylinder
MEVD17.2.4
- No ECU function or communication with the ECU
- Valvetroniv failure
- Cylinder burning time too short
- No ignition spark on one cylinder
MEVD17.2.5
- No ECU function or communication with the ECU
- Valvetroniv failure
- Cylinder burning time too short
- No ignition spark on one cylinder
MEVD17.2.8
- No ECU function or communication with the ECU
- Valvetroniv failure
- Cylinder burning time too short
- No ignition spark on one cylinder
MEVD17.2.9
- No ECU function or communication with the ECU
- Valvetroniv failure
- Cylinder burning time too short
- No ignition spark on one cylinder
MS41
- DME / EWS Related codes
- Engine temp gauge in red
- No ECU function or communication with the ECU
- DME RAM self-test checksum errors
- Electronic throttle controller
MS42
- DME / EWS Related codes
- Engine temp gauge in red
- No ECU function or communication with the ECU
- Water damage
- DME RAM self-test checksum errors
MS43
- DME / EWS Related codes
- Engine temp gauge in red
- No ECU function or communication with the ECU
- DME RAM self-test checksum errors
- Electronic throttle controller errors
MS45
- DME / EWS Related codes
- Engine temp gauge in red
- No ECU function or communication with the ECU
- DME RAM self-test checksum errors
MSD85.0 & MSD85.1
- No ignition spark on one cylinder
- Water damaged DME
- BSD communication fault: 2E7C
- Oil condition sensor fault code 2E9F
- DME internal error
MSD80
- No ignition spark on one cylinder
- 30BA or 30BB injection valve error
- Water damaged DME
- DME internal error
- Water damage
MSD85.3
- No ignition spark on one cylinder
- Water damaged DME
- BSD communication fault: 2E7C
- Oil condition sensor fault code 2E9F
- DME internal error
MSS50
- DME / EWS Related codes
- Water damage
- DME / ECU internal errors
- No ECU function or communication with the ECU
- DME RAM self-test checksum errors
MSS54
- DME / EWS Related codes
- ECU internal errors
- No ECU function or communication with the ECU
- DME RAM self-test checksum errors
MSV70
- No ignition spark on one cylinder
- Valvetronic failure
- Corrupted DME coding
- No communication with DME / ECU
- Water damage
How do BMW ECU / DME mail-in repairs work?
The ECU Pro offers an affordable mail-in ECU / DME repair service. To have your unit repaired, simply remove the ECU and mail it to us. Our professional team will either test, repair, or clone your unit.
To get the ECU repair process started on your BMW, you can:
- Send your current ECU, CAS / FEM / EWS, and key.
- We will run a full diagnostic test on your ECU.
- A repair or replacement ECU / DME will be offered, which you can decide on.
Our mail-in service is 100% plug-and-play and doesn't require any additional coding.
More information
Incorrect Sensor readings | Common ECU Failures
Sensor failures can significantly impact the performance and efficiency of your BMW. Common causes of sensor failures include low voltage, short to ground, or open circuits in the sensor wiring or within the ECU itself. These electrical issues prevent sensors from providing accurate data to the ECU, leading to various performance problems and fault codes.
Common Conditions Indicating Sensor Failure:
- Low Voltage: Insufficient voltage reaching the sensor due to a weak power supply, corroded connectors, or damaged wiring.
- Short to Ground: The sensor circuit is unintentionally connected to the ground, causing a short that disrupts normal operation.
- Open Circuit: A break in the wiring or disconnected sensor prevents signal transmission to the ECU.
Damage Due to Incorrect Jumpstarting | Common ECU Failures
Incorrectly jumpstarting a vehicle—such as connecting the positive (power) cable to the ground terminal and the negative (ground) cable to the positive terminal—can cause significant electrical damage to the vehicle's systems, including the ECU. This mistake can lead to the blowing of ground tracks within the ECU, disrupting its ability to properly ground circuits and causing various electrical issues and fault codes.
Common Fault Codes:
- No Communication with ECU: The ECU may fail to communicate with diagnostic tools due to internal damage.
- Multiple Sensor Faults: Fault codes related to various sensors caused by improper grounding.
- P2503: Charging System Voltage Low
- P0562: System Voltage Low
- Blown Fuses: Fuses related to the ECU's power supply may be blown repeatedly.
- Ground Fault Codes: Specific codes indicating grounding issues within the ECU circuits.
Symptoms of Ground Track Damage:
- Engine Starting Issues: The vehicle may fail to start or start intermittently.
- Electrical Malfunctions: Multiple electrical components malfunction simultaneously.
- Diagnostic Communication Failure: Inability to establish a connection with the ECU during diagnostics.
- Persistent Blown Fuses: Fuses blow repeatedly even after replacement, indicating an underlying grounding issue.
Repairing the damaged ground tracks on the ECU can resolve these issues, restoring proper electrical function and communication within the vehicle.
Incorrect Coding and Adaptation Issues | Common Signs of a failed ECU
These codes arise when the ECU is incorrectly coded or when adaptation processes fail, leading to mismatches in system operations. A typical sign of incorrect coding is the radiator cooling fans running continuously or at inappropriate times, even when the engine temperature is normal. This occurs because the ECU misinterprets signals due to incorrect settings, causing unnecessary fan operation.
Common Fault Codes:
- P1632: Incorrect ECU Coding
- P1637: Throttle Adaptation Error (potentially ECU-related)
Correcting the coding and adaptation issues can resolve these faults, aligning the ECU settings with the vehicle's specifications and stopping unnecessary fan operation.
How to identify ECU Related Misfires | Common signs of a failed ECU
Characteristics of ECU-Related Misfires:
- Occurs at Engine Startup: ECU-related misfires typically manifest immediately upon starting the engine, rather than developing after the engine has been running.
- Persistent on the Same Cylinder/Bank: The misfire remains on the same cylinder or bank, even after swapping ignition components.
Diagnostic Tip:
A practical method to determine if the misfire is ECU-related is to swap the ignition coil or fuel injector from the affected cylinder to another cylinder:
- If the Misfire Moves: If the misfire follows the component to the new cylinder, the issue is likely with the ignition coil or injector.
- If the Misfire Remains: If the misfire stays on the same cylinder, this suggests a potential ECU fault affecting that specific cylinder's control circuit.
Repairing ECU-related causes of engine misfires can restore proper engine performance and eliminate misfire codes. This may involve repairing or replacing faulty ECU components responsible for ignition timing and fuel injection control.
RAM and ROM Checksum Failures in Older BMW Vehicles | Common signs of a failed ECU
In older BMW models—particularly those equipped with ECUs like MS41, MS42, MS43, and MSS50—RAM and ROM checksum errors within the ECU can lead to incorrect processing of engine data. A hallmark symptom of this issue is the vehicle's temperature gauge moving into the red zone despite the engine not actually overheating. This false reading occurs because the ECU misinterprets the engine temperature data due to internal memory errors.
Common Fault Codes:
- P0601: Internal Control Module Memory Checksum Error
- P0605: Internal Control Module ROM Error
- Checksum Errors: Data integrity issues within the ECU memory
- Internal Module Errors: Indicating internal ECU failures
Repairing these RAM and ROM checksum failures will correct the erroneous temperature gauge readings and restore accurate data processing within the ECU, ensuring reliable engine management.
Communication, Serial Link, and BSD Line Faults | Common Signs of a failed ECU
Fault codes in this category relate to communication failures between the ECU and other vehicle systems, including issues with the Bit-Serial Data (BSD) line, which can disrupt the flow of critical information and affect the operation of connected components like the alternator, oil condition sensor, and intelligent battery sensor.
Common Fault Codes:
- P0600: Serial Communication Link Malfunction
- Communication Errors: Loss of communication with the ECU or other modules
- BSD Line Faults: Errors in the BSD communication line affecting data exchange between the ECU and peripheral components
- 2E7C: BSD Communication Fault with Alternator
- 2E7E: BSD Message; Intelligent Battery Sensor (IBS) Missing
- 2E98: BSD Communication Error with Alternator
- 2E9F: Oil Condition Sensor, Communication Fault
Repairing these communication and BSD line faults will re-establish proper data exchange within the vehicle's electronic systems and ensure the connected components function correctly.
Internal Memory and Processor Errors | Common Signs of a failed ECU
These fault codes indicate issues within the ECU's internal memory or processing units, affecting its ability to manage engine functions properly.
Common Fault Codes:
- P0601: Internal Control Module Memory Checksum Error
- P0605: Internal Control Module ROM Error
- P0606: ECM/PCM Processor Fault
- P062F: EEPROM Error
- 2F6C: DME Internal Fault—Monitoring Checksum
- 2F6E: DME Internal Fault—RAM Check
- 2F6F: DME Internal Fault—EEPROM Checksum
- 2FDB: DME Self-Diagnostic RAM Check
- P16A0: Internal Control Module Monitoring Processor Performance
- 1F2200: DME Internal Error—RAM Check
- 1F2108: DME Internal Error—Processor Monitoring
- 1F2109: DME Internal Error—Processor Performance
- Checksum Errors: Data integrity issues within the ECU memory
- Internal Module Errors: Indicating internal ECU failures
These internal memory and processor errors can sometimes be repaired to restore the ECU. If the ECU cannot be repaired, we offer replacement services for all ECUs.
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