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OBD-II Code

P1106

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–$180

From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.

$0 (reseating a connector or vacuum hose) to $180 (OEM MAP sensor + pigtail repair).

P1106 is GM's Manifold Absolute Pressure Sensor Circuit Intermittent High — the MAP signal voltage briefly spiked above the expected operating window during a drive cycle, then returned to normal, and the ECM logged the glitch.

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.

  1. 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.

  2. 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.

  3. 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.

  4. 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 procedureP1106 is GM's Manifold Absolute Pressure Sensor Circuit Intermittent High — the MAP signal voltage briefly spiked above the expected operating window…

P1106 is GM's Manifold Absolute Pressure Sensor Circuit Intermittent High — the MAP signal voltage briefly spiked above the expected operating window during a drive cycle, then returned to normal, and the ECM logged the glitch. On a typical GM 5V-reference MAP sensor, you should see 1.0-1.5V at key-on engine-off (atmospheric pressure), 1.0-1.8V at warm idle (high vacuum pulling the sensor LOW), and 2.5-4.5V under WOT or boost (low manifold vacuum or positive pressure pushing the sensor HIGH). An intermittent-high fault means the signal jumped to ~4.7V+ briefly when it shouldn't have — usually wiring, rarely the sensor itself.

Cheapest-first ladder

  1. Unplug the MAP connector, inspect for green corrosion or pushed-back pins, dielectric-grease and reseat ($0).
  2. Wiggle-test the harness with the engine idling and the scan tool live-graphing MAP voltage — if the spike correlates with a wiggle, you've found a broken wire or chafe-through to a heat source.
  3. Verify the 5V reference is steady (should be 4.9-5.1V) and the signal ground is clean (<0.1V drop to battery negative).
  4. Pull the sensor, blow out the vacuum port with compressed air (carbon can plug it on high-mileage trucks), and re-test.
  5. Replace the MAP sensor itself ($45-$90 OEM) only after the wiring checks out. Don't condemn the MAP before checking the vacuum source — a cracked vacuum hose to the sensor will mimic an intermittent-high signal because the sensor sees atmospheric pressure instead of manifold vacuum.
Vehicle-specific patterns1999-2013 Silverado / Tahoe / Suburban / Sierra / Yukon / Escalade with the LS-based 4.8/5.3/6.0/6.2 (LM7, LR4, LQ4, L59, LMG, L92, L9H) — the MAP se…
  • 1999-2013Silverado / Tahoe / Suburban / Sierra / Yukon / Escalade with the LS-based 4.8/5.3/6.0/6.2 (LM7, LR4, LQ4, L59, LMG, L92, L9H) — the MAP sensor sits at the rear of the intake manifold under the throttle body and gets baked by heat soak from the firewall; the connector pins corrode and the sensor's vacuum port carbon-clogs from PCV oil mist.
  • 2005-2010Cobalt / Cruze / Equinox with the Ecotec 2.0/2.2/2.4 (LSJ, LE5, LAF) throws P1106 from a cracked intake-manifold-mounted MAP vacuum reference passage on early models.
  • 2010+Camaro / CTS / Traverse with the LFX/LLT 3.6L V6 throws P1106 when carbon buildup around the MAP sensor port distorts the vacuum signal.
  • 2006-2010Silverado/Sierra HD with the LBZ/LMM Duramax has a boost-pressure sensor (functionally the MAP equivalent) that fails intermittently from soot fouling at the air-horn mount — clean it with throttle-body cleaner before condemning.

Estimated repair$0 (reseating a connector or vacuum hose) to $180 (OEM MAP sensor + pigtail repair).

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