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What the 12592525 Fits

The 3 Bar MAP Sensor (GM PN: 12592525) is the OEM-grade manifold absolute pressure transducer for GM's high-output Gen IV small-block platform. It is factory fitment on the supercharged LS9 (Corvette ZR1 C6) and the LSA (Cadillac CTS-V, Camaro ZL1), and turbocharged LS3 builds adopt it widely in the aftermarket.

Bosch manufactures it under GM's QS-9000/ISO-TS 16949 supply chain. The element resolves absolute pressure from ~10 kPa to 300 kPa (0.15 psi to 43.5 psi absolute). At sea level that is a usable boost ceiling of about 29.4 psi gauge, enough headroom for 800+ WHP builds before you step up to a 3.5 or 4 Bar sensor.

For 2026 model-year applications it stays backward-compatible with the GM E67, E38, and E92 ECM families and works with CAN FD 5 Mbps diagnostic backbones per ISO 11898-1:2024. The analog 0-5V ratiometric output needs no digital reflash on LS9, LSA, or LS3 applications.

2026 Specification Matrix

What Changed in the 2026 Production Run

The current iteration of the 12592525 MAP Sensor carries three manufacturing changes that matter if you run an LS platform into this decade.

PPS GF40 Housing

The body is molded from polyphenylene sulfide with 40% glass-fiber fill, rated for 150°C continuous exposure and 220°C transient spikes. It replaces the earlier PA66-GF35, which was prone to micro-cracking on 2010-2015 LSA platforms after sustained track-use heat soak.

The seal changed too. A Viton® fluorocarbon o-ring at 75 Shore A replaces the legacy nitrile seal and delivers 3x the service life under the positive crankcase pressure common to high-boost LS builds. The PPS GF40 body also lowers the thermal-hysteresis risk from repeated heat soak above 140°C intake temperatures, though the MEMS diaphragm can still develop a permanent offset.

4th-Generation MEMS Die

Bosch moved the diaphragm to a buried-resistor topology, which removes surface charge migration, the root cause of the P0106 Range/Performance ghost codes that hit legacy 2 Bar sensors on 15+ psi builds. Non-linearity stays under 0.5% across the full 300 kPa span.

The signal-conditioning ASIC adds digital temperature compensation through an on-chip PTAT (Proportional To Absolute Temperature) reference.

EMC Hardening for CAN FD

2026 platforms run CAN FD at 5 Mbps, and select EV architectures add IEEE 802.3cg 10BASE-T1S automotive Ethernet. Conducted EMI immunity is now above 200 mA BCI per ISO 11452-4:2025.

The output stage carries an integrated 2nd-order Sallen-Key low-pass filter with a -3 dB corner at 250 Hz to reject noise coupled from adjacent high-speed CAN FD twisted-pair wiring. On swapped cars with degraded shielding in a legacy loom, suspect the wiring before the sensor.

Tuning: The Real Work of a 3 Bar Swap

The sensor bolts in and plugs in. The calibration is where builds go wrong. Stock 1 Bar and 2 Bar linear/scalar tables misread the 3 Bar output, and the ECM flags P0106 until you recalibrate in HP Tuners, EFILive, or MoTeC.

Minimum steps for an LS3 turbo conversion

1. Set MAP Sensor Linear to 312.50 kPa/V and MAP Sensor Offset to -11.25 kPa.
2. Update the MAP sensor fail frequencies.
3. Populate the Power Enrichment EQ Ratio vs. MAP table above 105 kPa.
4. Extend the spark IAT/MAP correction tables into positive pressure.
5. Raise the MAF fail frequency if you run a speed-density hybrid.

On 2026 ECM reflashes, set the MAP Sensor Type parameter to 3 Bar rather than the default 1 Bar, and update the P0106/P0107/P0108 min/max diagnostic thresholds to cover the 300 kPa range.

Standalone ECUs are verified as well: Holley EFI HP/Dominator (select GM 3 Bar from the dropdown), AEM Infinity (custom calibration wizard), Haltech Elite 2500 (3 Bar GM preset), MoTeC M1 Series, and FuelTech FT600.

Same Sensor Job on Other Platforms

Servicing bikes too? The same reference-short and ground-offset diagnosis applies to the Suzuki 18590-17G01 boost sensor fitted to V-Strom 650 DL650 and SV650 variants, so one DMM workflow covers both bikes and LS swaps.

Nissan applications are covered by the 22365-JF00D manifold pressure MAP sensor, which spans Juke, Sentra, and GT-R models from 2009 to 2023 on the same three-wire ratiometric signal.

• For the full catalog of starters, alternators, ECUs, and wiring, browse the Koeep electrical parts collection to match this sensor with the rest of the engine-management system.
• To see where sensing hardware goes next, read our 2026 autonomous vehicle sensor forecast.

Diagnostic FAQ: Failure Codes and Fixes