C1739 Engine Trouble Code
What is C1739?
When C1739 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C1739 |
C1739 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
C1739 Code Structure
Understanding what each digit means in the C1739 chassis trouble code:
| C | 1 | 7 | 3 | 9 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Fuel Rail Pressure Sensor Circuit Malfunction | Injection Pump Fuel Metering Control 'A' High | Reverse Input Circuit |
How to Fix C1739
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
C1739 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
C1739 Description
C1739 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for C1739 OBD-II Engine Trouble Code is: Fuel Rail Pressure Sensor Circuit Malfunction.