P1607
Powertrain Control Module Internal Circuit Malfunction
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)
Symptoms
- Check Engine Light Is On
- Problems starting the engine
- Loss of engine power
- Unstable engine operation
- The engine goes into emergency mode
Causes
- Malfunction of PCM internal circuits
- Problems with module power or grounding
- Short circuit in wiring harness
- Voltage surges in the on-board network
- Physical damage to the PCM
How to Fix
- Check PCM power and ground
- Inspect the wiring harness for damage
- Check the voltage in the on-board network
- Flash or replace PCM
- Diagnosis by a specialist