B3687 Engine Trouble Code
What is B3687?
With B3687, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B3687 |
B3687 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
B3687 Code Structure
Understanding what each digit means in the B3687 body trouble code:
| B | 3 | 6 | 8 | 7 |
|---|---|---|---|---|
| Body Code | Ignition System Or Misfire | Fuel Temperature Sensor B Circuit Range/Performance | Ignition/Distributor Engine Speed Input Circuit Malfunction | Shift/Timing Solenoid Malfunction |
How to Fix B3687
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on B3687 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
B3687 Description
B3687 engine trouble code is related to Shift/Timing Solenoid Malfunction.
Main Cause
The primary reason for B3687 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.