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OBD-II Code

P1107

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–$220

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

$0 (cleaning a corroded ground or reseating a connector) to $220 (MAP sensor + harness pigtail + ground-strap upgrade).

P1107 is the mirror twin of P1106 — GM's MAP Sensor Circuit Intermittent Low.

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 procedureP1107 is the mirror twin of P1106 — GM's MAP Sensor Circuit Intermittent Low.

P1107 is the mirror twin of P1106 — GM's MAP Sensor Circuit Intermittent Low. The signal voltage briefly dropped below the expected floor (usually under 0.5V) and then recovered. Same 5V-reference MAP sensor as above: 1.0-1.5V key-on, 1.0-1.8V warm idle, 2.5-4.5V WOT or scaled higher on boosted applications. An intermittent-low fault almost always points at signal-wire issues, a bad ground, or a sensor that's losing internal continuity.

Cheapest-first ladder

  1. Wiggle-test the MAP harness with the scan tool live-graphing voltage — broken signal wires drop the reading to near-zero when the harness flexes.
  2. Check signal ground integrity — voltage-drop test from the sensor ground pin to battery negative with the key on, engine running; anything over 0.1V means a corroded ground point or broken ground wire.
  3. Verify the 5V reference is present at the connector (should be 4.9-5.1V) — if the reference is missing, you're chasing back to the ECM connector or a shared reference circuit feeding multiple sensors.
  4. Inspect the MAP vacuum port for engine-oil contamination from PCV blowby — oil pooled in the port can short the sensor element to ground intermittently.
  5. Replace the sensor ($45-$90) only after wiring and ground are confirmed clean. Don't replace the MAP sensor before checking the shared 5V reference circuit — on LS trucks the MAP, TPS, and BARO can share a reference splice, and one chafed wire upstream will throw multiple intermittent-low codes that all clear after one repair.
Vehicle-specific patterns1999-2013 Silverado / Tahoe / Suburban / Sierra / Yukon with the LS Vortec V8s — the MAP harness routes across the back of the intake and chafes agai…
  • 1999-2013Silverado / Tahoe / Suburban / Sierra / Yukon with the LS Vortec V8s — the MAP harness routes across the back of the intake and chafes against the firewall or the EGR delete plate; vibration eventually breaks the signal-wire copper inside the insulation.
  • 2005-2010Cobalt / HHR / Ion with the 2.2/2.4 Ecotec frequently throws P1107 from a known ground-strap issue at the rear of the cylinder head — GM issued PI bulletins on the ground-strap routing.
  • 2010+Equinox / Terrain / Malibu with the 2.4L LAF/LEA Ecotec throws P1107 when the MAP connector wicks moisture from the cowl drain backing up — the pins corrode green inside a sealed-looking connector.
  • 2010+Camaro SS / CTS-V with the LSA/LS3 and 2014+ Corvette Stingray with the LT1 throw P1107 from supercharger-related MAP harness routing on the LSA and from intake-manifold flex on the LT1.

Estimated repair$0 (cleaning a corroded ground or reseating a connector) to $220 (MAP sensor + harness pigtail + ground-strap upgrade).

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