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P1604 - Loss Of IPC Serial Data Conditions

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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Possible causes
- Faulty Instrument Panel Cluster (IPC)
- Instrument Panel Cluster harness is open or shorted
- Instrument Panel Cluster circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1604 Description

With the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) detects an invalid serial data signal or no serial data from the Instrument Panel Cluster (IPC) to PCM for 11 seconds.

P1604 Information for specific makes
P1604 AUDI Engine Control Module Defective
P1604 BUICK Loss Of IPC Serial Data Conditions
P1604 CADILLAC Loss Of IPC Serial Data Conditions
P1604 CHEVROLET Loss Of IPC Serial Data Conditions
P1604 DODGE PCM Internal Dual-Port RAM Read/Write Integrity Failure
P1604 GMC Loss Of IPC Serial Data Conditions
P1604 JEEP PCM Internal Dual-Port RAM Read/Write Integrity Failure
P1604 LEXUS Startability Malfunction
P1604 SAAB Engine Control Module Defective
P1604 TOYOTA Startability Malfunction
P1604 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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