Fiat 508 P273D Engine Trouble Code
What is Fiat 508 P273D?
The Fiat 508 P273D check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
P273D on the Fiat 508
Service bulletins for the Fiat 508 specifically mention P273D as a symptom of failed purge solenoid valves in the EVAP system. The solenoid body on this platform degrades in high-humidity environments and should be inspected whenever this code appears.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Fiat 508 |
| Brand: | Fiat |
| Model: | 508 |
| Code: | P273D |
P273D Fiat 508 Symptoms
Check Engine Light
Illuminated Fiat 508 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Fiat 508
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Fiat 508
Increased Emissions
Failed emissions test due to P273D
P273D Code Structure
Understanding what each digit means in the P273D powertrain trouble code:
| P | 2 | 7 | 3 | d |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Rail Pressure Sensor Circuit Malfunction | Injection Pump Fuel Metering Control 'A' High | System Malfunction |
How to Fix Fiat 508 P273D
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Excessive air inflow may result from vacuum leaks, dirty sensors, or EGR valves not closing properly. Insufficient fuel can stem from dirty injectors, clogged filters, weak fuel pump, or leaking pressure regulator.
Technical Notes:
P273D DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
Fiat 508 P273D Repair Cost
The EVAP purge valve is among the cheapest P273D fixes on the Fiat 508: the part itself retails for $25–$60 and installation takes under 30 minutes. A DIY-capable owner can complete this repair at home, keeping total expenditure below $80.
P273D Description
P273D engine trouble code is related to System Malfunction.
Main Cause
The primary reason for P273D OBD-II Engine Trouble Code is: Fuel Rail Pressure Sensor Circuit Malfunction.
Common P273D Misdiagnosis on the Fiat 508
Workshop technicians sometimes replace the entire ignition coil assembly on the Fiat 508 when P273D accompanies a cylinder-specific misfire. In many cases, only the spark plug in the misfiring cylinder has fouled; a $8 plug replaces a $140 coil pack.
DIY Repair Guide: P273D on Fiat 508
For Fiat 508 owners without a scan tool, a free diagnostic check is available at most franchised Fiat dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of P273D before committing to any repair.
Preventing P273D on the Fiat 508
Using only genuine or OEM-specification fuel injectors in the Fiat 508 ensures precise spray pattern and flow rate. Inferior aftermarket injectors are a documented trigger for P273D through off-target fuel delivery.
Frequently Asked Questions — Fiat 508 P273D
A: If your Fiat 508 is within the factory powertrain warranty period (typically 3–5 years or 60,000–100,000 miles depending on region and generation), P273D repairs caused by component defects should be covered. Bring your service history to the dealer appointment.