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Ford F53 Motorhome PCM Failure: Complete Diagnosis and Repair Guide
Engine Hard Several days for repair service 41

Ford F53 Motorhome PCM Failure: Complete Diagnosis and Repair Guide

Codes for entire bank coil malfunction indicate PCM failure not ignition problems. Shipping to PCM repair company for rebuild and reflash is good approach. Discoloration on board confirms internal failure. Common issue on late 90s Ford chassis.

1999 Itasca Sunflyer V10 Drivers Side Coil Bank PCM Issue
Engine Medium 2-4 hours for PCM replacement plus programming time 40

1999 Itasca Sunflyer V10 Drivers Side Coil Bank PCM Issue

Yes, you're absolutely on the right track - your testing clearly points to a PCM failure in the ground switching circuit for the drivers side coil bank. The fact that you have +12v but no ground pulse during cranking confirms the PCM isn't completing the circuit.

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