Check Engine Code
P0606
ECM/PCM Processor Fault
What P0606 means
P0606 is an internal self-check failure by the ECM. Sometimes caused by a bad battery dip; persistent P0606 usually means ECM replacement or repair.
Symptoms
- Check engine light
- Stalling
- Hard starting
- Random misfires
Likely causes (most common first)
- Weak battery or recent battery disconnection (often self-clears)
- Failed ECM
- Water damage to the ECM
- Bad ground
Can I keep driving?
High — risk of damage if ignored
Typical repair cost
DIY fixes can start near $150 (parts only). Shop repairs for P0606 typically run up to $1500 depending on the underlying cause and vehicle. Start with the most common cause — Weak battery or recent battery disconnection (often self-clears) — before throwing parts at it.
Symptoms that match P0606
If you got here from a search query, one of these might describe what your car is actually doing:
Recommended parts & tools for P0606
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