P1194 Fuel Pump Speed Signal Fault
The P1194 code indicates that the Powertrain Control Module (PCM) has detected an erratic, missing, or out-of-range speed signal from the Fuel Pump Driver Module (FPDM) or the fuel pump speed sensor. This fault prevents the PCM from properly regulating fuel pressure by modulating the pump, which can cause engine stalling or a no-start condition.
01. Most Common Causes
- Faulty Fuel Pump Driver Module (FPDM)
- Mechanical or electrical failure of the fuel pump
- Open, short-to-ground, or short-to-power in the wiring between PCM and FPDM
- Corroded, loose, or damaged connectors in the fuel pump circuit
- Internal PCM failure (rare)
02. Symptoms You Will Notice
- Engine stalling
- Engine cranks but does not start
03. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data.
Inspect wiring and connectors between PCM and FPDM for damage or corrosion.
Test FPDM power, ground, and signal circuits with a multimeter.
Verify fuel pump operation and speed sensor output.
If all else passes, test or replace the PCM.
1. Frequently Asked Questions
Is it safe to drive?▼
No, driving with this code is not recommended as it can cause sudden stalling or prevent the engine from starting, leading to a safety hazard.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the FPDM, fuel pump, or wiring needs replacement.