B0651 Engine Trouble Code
What is B0651?
When B0651 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 Body (B) Trouble Code |
| System: | Body |
| Code: | B0651 |
B0651 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
B0651 Code Structure
Understanding what each digit means in the B0651 body trouble code:
| B | 0 | 6 | 5 | 1 |
|---|---|---|---|---|
| Body Code | Intake Valve Control Solenoid Circuit Low | Fuel Temperature Sensor B Circuit Range/Performance | Cylinder 1 Injector Circuit Low | Crankshaft Position Sensor A Circuit Low Input |
How to Fix B0651
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:
B0651 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.
B0651 Description
B0651 engine trouble code is related to Crankshaft Position Sensor A Circuit Low Input.
Main Cause
The primary reason for B0651 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.