Harsh shifts, limp mode, or no reverse can be the Allison 1000 TCM, not the engine ECM. Here’s how 5-speed and 6-speed TCM symptoms differ from engine faults.
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- Troubleshooting & Diagnostics
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- Troubleshooting & Diagnostics
Cummins 5.9 24V ECM
Your 24-valve 5.9 cranks, surges, or dies and someone blamed the ECM. On VP44 trucks, the pump and harness fail first. Here’s how to sort the 24V ECM from the rest.
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- Troubleshooting & Diagnostics
Diesel ECM Overheating: Symptoms, Causes, and What to Do
A diesel ECM that overheats can derate the engine, drop scan-tool communication, or shut down entirely. The fix often starts with a missing heat shield or a disconnected coolant line, not a new module.
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DEF Derate vs ECM
A 5 mph or 25% derate is often DEF and SCR, not a dead ECM. Here’s how to tell a Cummins, Ford 6.7, or Duramax inducement from a real module failure.
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- Troubleshooting & Diagnostics
6.7 Power Stroke PCM
Your 6.7 Power Stroke is in limp mode or won’t start after a module swap. This is a PCM, not a FICM, and it needs VIN programming. Here’s what that actually requires.
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- Troubleshooting & Diagnostics
Paccar MX-13 ECM
Your Kenworth or Peterbilt MX-13 is derating, won’t start, or DAVIE can’t connect. Paccar MX-13 ECM symptoms are easy to mix up with harness and aftertreatment faults.
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INSITE No Communication
INSITE won’t connect to the Cummins ECM. Before you condemn the module, check the datalink, key switch, adapter, and J1939 path. Here’s the INSITE-specific order.
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- Troubleshooting & Diagnostics
Cat C15 ECM Failure
Your C15 is cranking, derating, or silent in Cat ET. C15 ECM failure looks a lot like harness and power problems. Here’s how to tell them apart.
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- Troubleshooting & Diagnostics
Cummins ISB 6.7 ECM
Your Ram or commercial ISB 6.7 is derating, won’t start, or won’t talk to INSITE. Cummins ISB 6.7 ECM symptoms overlap with harness and aftertreatment faults. Here’s what to check first.
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- Troubleshooting & Diagnostics
Duramax L5P ECM Replacement: Security and Programming Issues
Your L5P is throwing a P0606 or won’t start after a replacement ECM. Duramax L5P ECM replacement has a specific trap most people miss. Here’s what to check first.