OBD-II Code
P2229
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)
$80–$1,200
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P2229 is the high-input mirror of P2228 — BARO signal voltage above the expected upper threshold, typically over 4.7V on a 5V reference, which would represent a barometric pressure higher than any real-world condition (sea-level high-pressure systems top out near 105 kPa).
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 procedureP2229 is the high-input mirror of P2228 — BARO signal voltage above the expected upper threshold, typically over 4.7V on a 5V reference, which would…
P2229 is the high-input mirror of P2228 — BARO signal voltage above the expected upper threshold, typically over 4.7V on a 5V reference, which would represent a barometric pressure higher than any real-world condition (sea-level high-pressure systems top out near 105 kPa). High input is almost always either a signal wire shorted to the 5V reference or to battery voltage, or a sensor whose internal output stage has failed open and lets the pull-up resistor inside the ECU dominate the reading.
Cheapest-first
- disconnect the BARO/MAP sensor connector and read the signal wire voltage at the ECU end with key-on engine-off — if it stays pegged at 4.7V+ with the sensor unplugged, the short is in the harness between connector and ECU; if it drops to 0V or floats, the sensor itself is the fault.
- Check for pushed-back or bridged pins in the sensor connector — green corrosion shorting the signal pin to the 5V reference pin produces exactly this symptom and clears with a pin pick and dielectric grease.
- Confirm sensor ground integrity — a missing ground can elevate the signal reference.
- The 15-minute DMM circuit-isolation test almost always points cleanly at either harness, connector, sensor, or PCM without further teardown.
Vehicle-specific patterns2010-2017 Ford EcoBoost lineup (F-150 3.5L, Explorer 2.3L/3.5L, Edge Sport 3.5L) throws P2229 with internal-PCM BARO when the PCM's internal pressure…
- 2010-2017Ford EcoBoost lineup (F-150 3.5L, Explorer 2.3L/3.5L, Edge Sport 3.5L) throws P2229 with internal-PCM BARO when the PCM's internal pressure sensor output fails open — code is durable across drive cycles and points at PCM replacement ($700-$1,200 with programming).
- 2007-2013GM Vortec 5.3L/6.0L throws P2229 from a chafed harness where the MAP/BARO signal wire abrades against the 5V reference at a clip near the intake — splice repair fixes it.
- 2008-2012Dodge Ram 5.7L Hemi throws P2229 when the combination MAP/BARO sensor fails internally with the output transistor open — $80-$150 sensor, 0.4 hr labor.
- 2011-2016BMW N20/N55 turbo engines throw P2229 from a connector pin issue at the MAP/BARO sensor that BMW addressed via a TSB-style harness retrofit.
Estimated repair$80 to $1,200.
Look up another code
More free tools