P0606 An internal processor fault in the engine control module
10 owner reports and 319 manufacturer filings across 108 model years from Alfa Romeo, Audi, Buick, Cadillac and others.
Where P0606 shows up
Source: NHTSA manufacturer communications and complaintsShowing the 25 model years where P0606 appears most; it is on file for 108 in total.
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
P0606 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0606 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
Sixteen trouble codes were stored, including P26A6, P0606, P060B, P2138, P2135, P2122, P2119, P2004, P2005, and P0191
The contact stated that upon scanning the vehicle, the contact retrieved DTC: P0606 and P062B
The vehicle was towed to a local independent mechanic, where it was diagnosed and DTC: P1602 (PCM not Programmed) and P0606 (Error with PCM) were retrieved
The vehicle was taken to an independent mechanic, who diagnosed that the TCM needed to be replaced due to error code P0606
Brakes and steering limited could not drive unsafe turned off ignition restarted threw five codes including P0606 C0021 P25A2 called onstar, they said all systems showing failed take to dealer called gm- they said to have it towed remote…
319 manufacturer filings name P0606. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P0606.
- PIT6522 Service bulletin2026-06-10 · Unknown Or Other
- This PI advises dealers that if the K160 Brake System Control Module sets DTC P0606 along with P0562 and/or P25A2, additional diagnostic aids should be followed before replacing parts. The PI provides guidance to inspect for low voltage conditions, wiring, terminal concerns, and module communication issues that may cause false or intermittent EBCM DTCs.
- PIT6521 Service bulletin2026-06-09 · Unknown Or Other
- This PI advises dealers that if DTC P0606 and/or P0607 are set in the K160 EBCM, additional diagnostic aids should be followed to ensure the module requires replacement
- PIT6347B Service bulletin2026-03-26 · Unknown Or Other
- This Preliminary information communicates an issue with ABS SES MIL / Service Brake System / Service StabiliTrak / BSCM DTC P0606 P0562 and dealers to perform additional battery and connection testing.
- TSB_2079890_1 Service bulletin2025-11-11 · Engine
- This bulletin provides information when he MIL is on, and DTC P0606 is stored in the ECM, V8 TFSI.
- 09-135-25 Service bulletin2025-05-20 · Engine
- This bulletin announces availability of new reprogramming files developed to address cases of DTC P0606 (Control Module Processor) detected by the Engine Control Module (ECM).
- 18-006-25 REV. A Service bulletin2025-03-20 · Power Train
- "Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit the following Diagnostic Trouble Code (DTC): ● P0606 - Control Module Processor. Customers may also experience the following: ● Vehicle goes into limp-in mode. REPAIR SUMMARY: **This bulletin involves inspecting and possibly reprogramming the PCM wi
What P0606 means
Source: SAE J2012 / OBD-IIAn internal processor fault in the engine control module.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P0606
Source: NHTSA files and the OBD-II standardCan I keep driving with P0606 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.