What causes fault code P027E?

• Most likely: Short to voltage in the wiring harness between the ECM and the Fuel Pump Control Module • Likely: Faulty Fuel Pump Control Module (FPCM/FPPM) • Possible: Faulty fuel pump causing high current draw or voltage feedback • Rare: Internal Engine Control Module (ECM) failure

Powertrain (Engine & Gearbox)Standard EOBD

P027E - Fuel Pump Module B Control Circuit High

Q: What are the symptoms of fault code P027E?

• Check engine light (MIL) illuminated • Engine may be hard to start or stalls shortly after starting • Reduced engine performance (Limp mode) • Unusual noise from the fuel pump due to maximum duty cycle • Unburnt fuel smell from the exhaust

Q: How do you fix fault code P027E?

STEP 1: Check fuses for the fuel pump module and ECM, then inspect connectors for corrosion or loose pins. STEP 2: Measure voltage on the control line at the fuel pump module with ignition on. If 12V is constant when it should be PWM/low, trace the short to voltage in the harness. STEP 3: Verify ground points for both the ECM and fuel pump module. Resistance should be below 0.5 Ohms. STEP 4: Use an oscilloscope to verify the PWM signal from the ECM. If the signal is correct but the module output is high, replace the fuel pump module. STEP 5: Clear codes and perform a road test; note that some vehicles require module programming/adaptation after replacement.

Last updated:1 February 2026

Related:Fuel Pump Control Module (FPCM), Engine Control Module (ECM), Fuel Pump, Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

P027E is a generic diagnostic trouble code indicating that the Engine Control Module (ECM) has detected a high voltage condition in the fuel pump module 'B' control circuit. Many fuel systems utilize a Fuel Pump Power Module (FPPM) or Fuel Pump Control Module (FPCM) to regulate fuel delivery via PWM signals. If the control circuit feedback demonstrates a voltage level higher than the commanded threshold (often a short to power or an internal module failure), P027E is stored. This may cause the vehicle to enter limp-home mode to prevent mechanical damage or excessive fuel rail pressure.

Possible Causes

Short to voltage in the wiring harness between the ECM and the Fuel Pump Control Module

Faulty Fuel Pump Control Module (FPCM/FPPM)

Faulty fuel pump causing high current draw or voltage feedback

Internal Engine Control Module (ECM) failure

Symptoms

Check engine light (MIL) illuminated

Engine may be hard to start or stalls shortly after starting

Reduced engine performance (Limp mode)

Unusual noise from the fuel pump due to maximum duty cycle

Unburnt fuel smell from the exhaust

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P027E - Fuel Pump Module B Control Circuit High

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P027E - Fuel Pump Module B Control Circuit High

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