What causes fault code P012E?

• Most likely: Loose connection or corrosion in the sensor connector • Likely: Faulty Inlet Pressure Sensor (TCIP) • Possible: Damaged wiring harness (chaffing against engine or chassis) • Rare: Internal Engine Control Unit (ECU) failure or software glitch

Powertrain (Engine & Gearbox)Standard EOBD

P012E - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Intermittent/Erratic

Q: What are the symptoms of fault code P012E?

• Check engine light (MIL) illuminated • Reduced engine performance (Limp mode) • Uneven idle or hesitation during acceleration • Increased fuel consumption • Abnormal turbocharger noises during boost transitions

Q: How do you fix fault code P012E?

STEP 1: Inspect the TCIP sensor connector for moisture, corrosion, or pushed-out pins. Clean with contact cleaner. STEP 2: Perform a continuity test on the wiring. Check for a stable 5V reference voltage and ground using a multimeter. Monitor signal voltage; it should be steady at idle (approx. 1.0-2.0V depending on altitude). STEP 3: Use an oscilloscope to look for 'noise' or dropouts in the signal while wiggling the wire harness to locate intermittent breaks. STEP 4: If wiring is intact but the signal remains erratic, replace the inlet pressure sensor. Clear DTCs and perform a road test.

Last updated:1 February 2026

Related:Inloppstryckssensor (TCIP), MAP-sensor, Turbocharger, Engine Control Unit (ECU), Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

P012E is a generic diagnostic trouble code (DTC) indicating that the Engine Control Unit (ECU) has detected an intermittent or erratic signal from the Turbocharger/Supercharger Inlet Pressure sensor circuit. This sensor monitors the air pressure before the turbocharger inlet, enabling the ECU to calculate air density and compensate for altitude or atmospheric changes. When the voltage signal fluctuates rapidly or drops out momentarily in a way that doesn't correlate with engine load, the P012E code is set.

Possible Causes

Loose connection or corrosion in the sensor connector

Faulty Inlet Pressure Sensor (TCIP)

Damaged wiring harness (chaffing against engine or chassis)

Internal Engine Control Unit (ECU) failure or software glitch

Symptoms

Check engine light (MIL) illuminated

Reduced engine performance (Limp mode)

Uneven idle or hesitation during acceleration

Increased fuel consumption

Abnormal turbocharger noises during boost transitions

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P012E - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Intermittent/Erratic

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P012E - Turbocharger/Supercharger Inlet Pressure Sensor Circuit Intermittent/Erratic

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