P1687

Symptoms

• Dashboard readings do not work or are displayed incorrectly
• The Check Engine light comes on
• Problems starting the engine
• Loss of communication with other systems via CAN bus

Causes

• Broken or damaged CAN bus wires
• Dashboard malfunction
• Problems with the engine control module
• Short circuit in communication circuit
• Bad contacts in connectors

How to Fix

1. Check the integrity of the CAN bus wiring
2. Scan all modules for other errors
3. Check connections and connectors on the dashboard
4. Test CAN bus signals with an oscilloscope
5. Replace instrument panel or ECM if necessary

Related codes

Error P1687 by Vehicle Brand