P1400 on Ford
EGR / DPFE Sensor Circuit Low Voltage (manufacturer-specific)
P1400 on Ford vehicles indicates egr / dpfe sensor circuit low voltage (manufacturer-specific). Au7o has documented this code across 1 Ford model — most commonly on F-150. P1xxx codes are manufacturer-defined, so confirm P1400 against your specific brand before buying parts. On Ford — the best-documented version — it is DPFE (Differential Pressure Feedback EGR) sensor circuit low voltage: the PCM saw an out-of-range low signal from the sensor that measures EGR flow. Volkswagen/Audi use P1400 for an EGR valve circuit electrical fault, GM uses it for the cold start emission reduction control system, and Subaru for a fuel tank pressure control solenoid valve circuit fault. In each case it is an emissions fault: the check engine light comes on, the vehicle will fail an emissions test, and you may notice rough idle, pinging, or slightly reduced fuel economy. Typical repair costs on Ford range from $50 to $250, depending on the specific model and root cause.
Common Causes of P1400
- •Failed DPFE / EGR pressure feedback sensor (Ford)
- •Cracked, collapsed, melted, or disconnected rubber hoses between the EGR tube and the DPFE sensor
- •Clogged EGR passages or a carbon-fouled EGR valve
- •Open, shorted, or corroded wiring/connector in the sensor or EGR solenoid circuit (VW/Audi: EGR valve circuit electrical fault)
- •Failed EGR vacuum regulator solenoid
- •Failed PCM/ECU driver circuit (rare — verify everything else first)
P1400 on Ford by Model
Ford F-150(1 issue)
- DPFE / EGR Pressure Sensor Failure — Rough Idle, Stalling, and P0401 (2-Valve Triton)1997-2004
The Delta Pressure Feedback EGR (DPFE) sensor and the EGR throttle-body spacer passages are a chronic Check-Engine source on 1997-2004 4.2L/4.6L/5.4L trucks. The ceramic DPFE sensor drifts or cracks, and the narrow 90-degree EGR elbow passages carbon up until flow is blocked, setting P0401 (insufficient EGR flow). The result is a rough idle, stumble or stall when coming to a stop, hesitation, and reduced fuel economy. It is frequently misdiagnosed as the EGR valve itself.
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View P1400 across all makes →Frequently Asked Questions
What does P1400 mean on Ford?▼
P1400 stands for "EGR / DPFE Sensor Circuit Low Voltage (manufacturer-specific)." P1xxx codes are manufacturer-defined, so confirm P1400 against your specific brand before buying parts. On Ford — the best-documented version — it is DPFE (Differential Pressure Feedback EGR) sensor circuit low voltage: the PCM saw an out-of-range low signal from the sensor that measures EGR flow. Volkswagen/Audi use P1400 for an EGR valve circuit electrical fault, GM uses it for the cold start emission reduction control system, and Subaru for a fuel tank pressure control solenoid valve circuit fault. In each case it is an emissions fault: the check engine light comes on, the vehicle will fail an emissions test, and you may notice rough idle, pinging, or slightly reduced fuel economy. On Ford specifically, this code is documented across 1 model.
What causes P1400 on Ford vehicles?▼
Common causes on Ford: Failed DPFE / EGR pressure feedback sensor (Ford), Cracked, collapsed, melted, or disconnected rubber hoses between the EGR tube and the DPFE sensor, Clogged EGR passages or a carbon-fouled EGR valve, Open, shorted, or corroded wiring/connector in the sensor or EGR solenoid circuit (VW/Audi: EGR valve circuit electrical fault), Failed EGR vacuum regulator solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1400 on a Ford?▼
Repair costs on Ford range from $50 to $250, depending on the specific model and root cause.
Which Ford models have P1400 documented?▼
Au7o has documented P1400 on 1 Ford model: F-150.