OBD-II Code
P0249
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)
$130–$560
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0249 reports the wastegate solenoid B control circuit voltage is below threshold, again pointing to a short to ground in the control wire, a shorted solenoid, or a damaged PCM driver.
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 procedureP0249 reports the wastegate solenoid B control circuit voltage is below threshold, again pointing to a short to ground in the control wire, a shorted…
P0249 reports the wastegate solenoid B control circuit voltage is below threshold, again pointing to a short to ground in the control wire, a shorted solenoid, or a damaged PCM driver.
Cheapest diagnostic step
- visually trace the wastegate B harness from the solenoid back to the first connector or splice, paying special attention to anywhere it runs near hot exhaust components.
- Disconnect the solenoid and measure resistance pin-to-pin (14-30 ohms typical) and from each pin to chassis ground (should read open or above 10K ohms); a low reading to ground confirms either a shorted winding or a pinched control wire.
- The expensive misdiagnosis is throwing a turbocharger at the problem ($1,800-$3,500) when a $25 length of harness repair and a $90 solenoid would have resolved it.
Vehicle-specific patterns2007-2010 BMW N54 rear-bank wastegate solenoid wire shorts to the turbo heat shield bracket, fixed under SIB 11 02 09; 2011-2016 Ford F-150 3.5L EcoB…
- 2007-2010BMW N54 rear-bank wastegate solenoid wire shorts to the turbo heat shield bracket, fixed under SIB 11 02 09;
- 2011-2016Ford F-150 3.5L EcoBoost right-side wastegate harness pinches between the valve cover and intake manifold during service;
- 2013-2019Cadillac ATS/CTS 2.0T (LTG) solenoid B ground splice S301 corrodes at the firewall pass-through;
- 2015-2020Audi RS3/TTRS 2.5T wastegate harness chafes against the timing chain cover.
Estimated repair$130 to $560.
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