C0849 Engine Trouble Code
What is C0849?
When C0849 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: | C0849 |
C0849 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
C0849 Code Structure
Understanding what each digit means in the C0849 chassis trouble code:
| C | 0 | 8 | 4 | 9 |
|---|---|---|---|---|
| Chassis Code | Intake Valve Control Solenoid Circuit Low | Engine Oil Temperature Sensor Malfunction | Injection Pump Fuel Metering Control 'B' High | Reverse Input Circuit |
How to Fix C0849
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:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
C0849 DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
C0849 Description
C0849 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for C0849 OBD-II Engine Trouble Code is: Engine Oil Temperature Sensor Malfunction.