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P1603 - Loss Of Sensing Diagnostic Mode Data Conditions

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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Possible causes
- Faulty Sensing Diagnostic Module (SDM)
- Sensing Diagnostic Module harness is open or shorted
- Sensing Diagnostic Module circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1603 Description

With the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) did not receive any Sensing Diagnostic Module (SDM) data or received invalid data during a 1 second period.

P1603 Information for specific makes
P1603 AUDI Engine Control Module Defective
P1603 BUICK Loss Of Sensing Diagnostic Mode Data Conditions
P1603 CADILLAC Loss Of Sensing Diagnostic Mode Data Conditions
P1603 CHEVROLET Loss Of Sensing Diagnostic Mode Data Conditions
P1603 CHRYSLER PCM Internal Dual-Port Communication Failure
P1603 DODGE PCM Internal Dual-Port Communication Failure
P1603 GMC Loss Of Sensing Diagnostic Mode Data Conditions
P1603 HYUNDAI CAN Communication Bus Error
P1603 JEEP PCM Internal Dual-Port Communication Failure
P1603 KIA CAN Communication Bus Error
P1603 MAZDA Engine Control Module Incorrect Immobilizer Code
P1603 MERCEDES-BENZ Engine Control Module Defective
P1603 MITSUBISHI Battery Backup Line Malfunction
P1603 SAAB Engine Control Module Defective
P1603 VOLKSWAGEN Engine Control Module Defective
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Repair Importance Level: 3
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard What does this mean?
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