P0606
PCM Processor Fault
This code means the engine's main computer, the Powertrain Control Module (PCM), has detected an internal error or malfunction within its own processor. It's like the brain of the car having a stroke.
ECM/PCM Processor Fault
Common causes
- high
Internal PCM Failure
The most common cause is an internal defect or failure within the PCM's hardware or software.
Typical part cost: $500-1500+ part
- medium
Voltage/Ground Issues to PCM
Poor power supply or ground connections to the PCM can cause internal errors or erratic behavior.
Typical part cost: $0-200 repair
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P0606.
Unlock causesFree forever · No credit card
First things to check
- 1Check for any other codes present, as they might be symptoms of the PCM fault.
- 2Inspect all PCM power and ground wires for corrosion, looseness, or damage.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P0606.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P0606.
Unlock related codesFree forever · No credit card
Frequently asked questions
What is the PCM?
The PCM (Powertrain Control Module) is the main computer that controls the engine and often the transmission, managing everything from fuel injection and ignition timing to emissions and diagnostics.
Can I fix a P0606 myself?
Fixing a P0606 is typically beyond DIY capabilities. It usually requires specialized diagnostic tools, and often, the replacement and programming of a new PCM by a professional technician.
Get the full P0606 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.