P0606: PCM Processor Fault
4 vehicles · 4 makes · $300-$900 repair
Most Reported On
P0606 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2002-2016 Citroen C3 (Live, Feel), 2023-2024 Jeep Avenger, and 2020-2022 Hyundai Venue, plus 1 other vehicle, with repair costs ranging from $300 to $900.
Common Causes
Typical Repair Cost
Based on 4 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0606, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (4)
FAQ
What does P0606 mean?
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.
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?
Repair costs for P0606 range from $300 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0606?
Au7o has documented P0606 across 4 vehicle models from 4 manufacturers: Citroen, Hyundai, Jeep, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.