Error code

OBD2 P0800

OBD2P0800
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transfer Case Control System (MIL Request).

Severity

moderateCan drive, but performance may be affected and fuel economy reduced.

Summary

P0800 indicates a malfunction in the transfer case control system, which manages four-wheel drive systems electronically. This code is set when the TCCM (Transfer Case Control Module) detects an issue and requests the MIL (Malfunction Indicator Light) to be illuminated.

Symptoms

  • Check engine light (CEL) is on
  • Reduced fuel economy

Common Causes

  • Stuck range actuator due to rust or lack of use
  • Vacuum leaks in the front axle disconnect system

Diagnosis

  1. Check for additional TCCM-specific codes using a compatible scan tool
  2. Inspect the range actuator for rust or damage
  3. Look for vacuum leaks in the front axle disconnect system

Fixes

  • Replace the stuck range actuator if necessary
  • Repair any vacuum leaks and replace damaged components

FAQ

What does P0800 mean?

P0800 indicates a malfunction in the transfer case control system, which manages four-wheel drive systems electronically.

How do I fix P0800?

Fixing P0800 involves diagnosing and addressing specific issues like stuck range actuators or vacuum leaks. Consult a mechanic for proper diagnosis and repair.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →