B1783 fault code: what it means

B1783: Stop lamp control general electrical failure (Gladiator, JL Wrangler). FCA links it to aftermarket or Mopar trailer brake controllers feeding back 12V; ABS reflash.

Body · Minor

Usual causes, most likely first

1. trailer brake controller back-feed
2. stop lamp wiring
3. ABS/BCM software

B1783 by make

Not sure what B1783 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.