P1600high severityPowertrain
ECM/PCM Serial Communication Link Malfunction
on 1998 Honda Passport 3.2L V6 · AWD
What this code means
The serial communication link between the ECM/PCM and other modules is faulty. This can disrupt data sharing across the vehicle network.
Symptoms
- Check engine light on
- Multiple modules not responding
- Warning lights on dash
Common causes
- Wiring or connector fault
- Poor ground or power supply
- Faulty control module
- Failed ECM/PCM
Diagnostic steps
- Scan and confirm P1600
- Check communication line wiring and grounds
- Verify module power supplies
- Test bus with scan tool for missing modules
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P0005
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P0006
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P0007
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P0008
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P0010
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