P0606 on Hyundai: How to Diagnose & Fix
PCM Processor Fault
1 Hyundai model · 1 documented issue · 1 critical
P0606 on Hyundai by model: symptoms, diagnosis and fix
Venue owners, concentrated on the 2020 model, report the engine unexpectedly shutting off, particularly while slowing or coming to a complete stop, sometimes with rough idle. Some cases are traced to a faulty or corroded wiring-harness connector near the battery causing intermittent power interruptions. CarComplaints and YourMechanic both document the slow-down/stop shut-off pattern, with stalling reported at low mileage.
Common Symptoms
- Engine shuts off when slowing or stopping
- Random stalling while driving / loss of power
- Rough idle
- No-start or hard-start after the engine dies
How to Fix
Have the dealer inspect and repair the battery/wiring-harness connector and check for stored DTCs and applicable TSBs; corroded or loose connectors should be cleaned or replaced. Persistent stalling the dealer cannot resolve over multiple visits may qualify under state lemon laws. On 2024 models, rule out the separate EGR-valve recall (24V308).
Sources for this issue (2)
P0606 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0606 mean on a Hyundai?
P0606 stands for "PCM Processor Fault." P0606 indicates an internal processor or performance fault within the powertrain control module (PCM) — essentially the engine's main computer has detected that one of its own internal circuits or processors is not functioning correctly. Because the PCM controls fuel, ignition, and many other functions, an internal fault can affect almost any aspect of engine operation. Symptoms range from no obvious effect to stalling, no-start, erratic running, or multiple unrelated trouble codes appearing together. This often points to the module itself, though power and ground supply issues can mimic it. On Hyundai it is documented across 1 model: Venue.
What are the most common causes of P0606?
The most common causes of P0606 are: Poor power or ground supply to the PCM, Corroded, loose, or damaged PCM connectors, Low system/battery voltage or charging system fault, Water intrusion or corrosion at the module, Internal PCM hardware/processor failure, Failed or corrupted PCM software needing reflash, Wiring damage affecting the PCM power/ground circuits. The specific cause varies by vehicle.
How much does it cost to fix P0606 on a Hyundai?
Repair costs vary widely with the root cause and Hyundai model; each issue on this page carries its own estimate where one is published.
Looking for P0606 on a different make?
View P0606 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.