What causes fault code P027D?

• Most likely: Faulty Fuel Pump Driver Module (FPDM) • Likely: Short to voltage (B+) in the control circuit wiring between the ECM and FPDM • Possible: Faulty Engine Control Module (ECM) • Rare: Poor ground connections leading to a floating voltage reference

How do you fix fault code P027D?

STEP 1: Visually inspect the wiring harness and connectors at the FPDM and ECM. Look for signs of corrosion, moisture, or chafed wires. STEP 2: Measure the voltage on the control circuit with the ignition ON. If a constant 12V is measured when the ECM expects a PWM signal or 0V, isolate the circuit to determine if the short is in the harness or the component. STEP 3: Use an oscilloscope to monitor the PWM duty cycle from the ECM. If the signal is stuck high despite known good wiring, the ECM may be internaly faulted. STEP 4: If the driver module is faulty, replace the FPDM. Note that some models require software configuration/coding using an OEM scan tool after replacement.

Powertrain (Engine & Gearbox)Standard EOBD

P027D - Fuel Pump Driver Control Circuit High

Q: What are the symptoms of fault code P027D?

• Check engine light (MIL) illumination • Engine will not start (No start condition) • Engine hesitates under load or stalls sporadically • Vehicle may enter Limp Home Mode • Poor fuel economy due to inaccurate pressure regulation

Last updated:1 February 2026

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

System

Powertrain (Engine & Gearbox)

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Technical Description

P027D is a generic diagnostic trouble code (DTC) defined by SAE/ISO standards. It signifies that the Engine Control Module (ECM) has detected an abnormally high voltage condition in the fuel pump driver control circuit. The fuel system typically uses a Pulse Width Modulated (PWM) signal from the ECM to the Fuel Pump Driver Module (FPDM) to regulate delivery pressure by varying pump speed. A 'High' condition usually indicates that the control wire is shorted to power or that the FPDM is unable to pull the signal low as commanded. This disrupts the closed-loop fuel pressure control and can lead to severe driveability issues or a complete no-start condition.

Possible Causes

Faulty Fuel Pump Driver Module (FPDM)

Short to voltage (B+) in the control circuit wiring between the ECM and FPDM

Faulty Engine Control Module (ECM)

Poor ground connections leading to a floating voltage reference

Symptoms

Check engine light (MIL) illumination

Engine will not start (No start condition)

Engine hesitates under load or stalls sporadically

Vehicle may enter Limp Home Mode

Poor fuel economy due to inaccurate pressure regulation

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P027D - Fuel Pump Driver Control Circuit High

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P027D - Fuel Pump Driver Control Circuit High

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