OBD-II Code
P2107
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$0–$2,000
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$0 (clean ground/connector) to $2,000 (PCM replacement + programming).
P2107 means the ECU has detected a fault in the throttle actuator control module's internal processor — the dedicated microcontroller that manages the closed-loop control of the electronic throttle body has failed an internal self-check, lost communication with the main ECU, or detected a hardware error in its own circuitry.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP2107 means the ECU has detected a fault in the throttle actuator control module's internal processor — the dedicated microcontroller that manages th…
P2107 means the ECU has detected a fault in the throttle actuator control module's internal processor — the dedicated microcontroller that manages the closed-loop control of the electronic throttle body has failed an internal self-check, lost communication with the main ECU, or detected a hardware error in its own circuitry. On most modern vehicles the TAC processor is integrated into the main ECU/PCM rather than a standalone module, so P2107 is typically an ECU-internal fault rather than a wiring or sensor issue.
The cheapest-first ladder
- check ECU power and ground integrity first — voltage drop at the ECU main power feed should be under 0.1V under full load, ground continuity to chassis under 0.3 ohms.
- A failing ECU ground is the single most common cause of phantom processor codes; pull and clean the engine-to-chassis ground strap and the ECU's dedicated ground points.
- Scan-tool the battery voltage feed seen by the ECU at idle and at 2,500 RPM — it should track battery voltage within 0.2V; a sagging voltage feed from a tired battery or a corroded fuse box causes the ECU to fail its internal voltage rails check and set P2107.
- Verify the ECU is at the current calibration level — a missed flash update will set P2107 on some platforms after a battery disconnect, and the fix is a re-flash rather than a module replacement.
- The expensive-misdiagnosis caveat: don't replace the ECU on a standalone P2107 without first verifying power, ground, and software calibration — a new ECU is $600-$2,000 plus dealer programming, but a $5 wire-brushed ground strap or a free re-flash clears most of these codes;
- ECU replacement should be the last step after every external cause has been ruled out.
Vehicle-specific patterns2007-2014 GM Vortec 5.3/6.0 trucks/SUVs throw P2107 less often than P2104/P2105 but follow the same pattern when the main PCM ground at the cylinder…
- 2007-2014GM Vortec 5.3/6.0 trucks/SUVs throw P2107 less often than P2104/P2105 but follow the same pattern when the main PCM ground at the cylinder head develops corrosion; a wire-brush and dielectric grease typically clears it.
- 2010-2014Ford F-150 3.5 EcoBoost throws P2107 from PCM internal voltage rail faults that almost always trace back to a corroded battery terminal or a failing alternator with high AC ripple; check ripple voltage under 0.1V AC before condemning the PCM.
- 2008-2014Chrysler/Dodge 3.6 Pentastar (Town & Country, Journey, Charger) throws P2107 from a documented PCM connector pin-fretting issue at the C1 connector; re-seat and grease the connector pins.
- 2007-2013BMW E90/E60 throws P2107 (DME processor faults) from internal DME failures that BMW occasionally covered under emissions warranty.
Estimated repair$0 (clean ground/connector) to $2,000 (PCM replacement + programming).
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