This error code arises when there is a data transfer issue between the User Interface Controller (UIC) and the ECU, leading to intermittent or nonexistent reception of CAN messages concerning general transmission information.

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This diagnostic trouble code is generated when there is a data transfer problem between the Transmission Control Unit (TCU) or Engine Power Control (EPC) and the Engine Control Unit (ECU), characterized by intermittent or nonexistent reception of CAN messages.

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Error code ECU 001761.18 is triggered when the DEF tank fluid level falls below 0 percent, indicating that the tank is effectively empty. This critical condition can severely impact the vehicle’s emissions control system and could lead to engine derate or shutdown to comply with emissions regulations.

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Error code ECU 001761.17 is activated when the DEF tank fluid level drops below 10 percent. This moderate level warning is intended to prompt refilling to ensure continuous operation of the emissions control system.

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This error code, ECU 001761.04, is set when the ECU detects that the voltage at the DEF tank fluid level sensor is too low, indicating a short to ground. This can lead to faulty DEF level readings and potentially affect the vehicle’s ability to meet emissions standards.

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Error code ECU 001761.03 is triggered when the ECU detects that the voltage at the DEF tank fluid level sensor is too high, suggesting a short to a 12V power source. This abnormal voltage reading can lead to inaccurate DEF level readings, affecting emissions control.

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Error code ECU 001761.01 is triggered when the ECU detects an extremely low fluid level in the Diesel Exhaust Fluid (DEF) tank, which is crucial for maintaining emissions control in diesel engines.

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This error code, ECU 001639.18, is set when the ECU detects that the rotational speed of the proportional solenoid valve for the charge air cooler is lower than expected, possibly due to a malfunction or obstruction in the valve.

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Error code ECU 001639.16 is triggered when the ECU detects that the rotational speed signal from the proportional solenoid valve for the charge air cooler is moderately higher than expected. This may indicate an issue with the solenoid valve’s control or a sensor malfunction affecting its operation.

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Error code ECU 001639.01 is triggered when the ECU does not detect any rotational speed signal from the proportional solenoid valve for the charge air cooler. This issue may result from a malfunction in the sensor or related wiring.

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This error code, ECU 001569.31, is set when the ECU imposes a fuel derate, meaning the engine is in a derate condition. This typically occurs to protect the engine from damage due to detected faults that could compromise its safety, efficiency, or emissions.

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