Error code

OBD2 P0618

OBD2P0618
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Alternative Fuel Control Module KAM Error.

Severity

severeNot recommended to drive until resolved due to potential safety risks.

Summary

P0618 indicates a malfunction or failure of the Keep Alive Memory (KAM) within the Alternative Fuel Control Module, which is integrated into the Powertrain Control Module (PCM). This module manages fuel supply for vehicles using alternative fuels.

Symptoms

  • Illuminated warning light
  • Engine may not idle properly or have rough idling
  • Increased fuel consumption
  • Unexpected engine stalls at low speeds
  • Harsh or unpredictable gear shifts

Common Causes

  • Malfunctioning Alternative Fuel Control Module
  • Programming errors in the PCM
  • Damaged, shorted, disconnected, or corroded wiring and connectors
  • Abnormal system voltages or malfunctions in the charging system
  • Water ingress into the PCM or its connector
  • Failed or failing PCM

Diagnosis

  1. Record all codes and freeze frame data before clearing any codes.
  2. Check battery condition, terminals, and grounding points for corrosion or damage.
  3. Inspect visible wiring and connectors for issues.
  4. Restore original PCM programming if modified.
  5. Consult vehicle manual to address related voltage and charging system issues.

Fixes

  • Replace the PCM or other control modules as needed.
  • Repair or replace damaged wiring and connectors.

FAQ

How do I troubleshoot P0618?

Start by recording all codes, freeze frame data, and failure records. Check battery condition and visible wiring issues. Restore original PCM programming if modified.

What are common mistakes when fixing P0618?

Failing to address additional codes in the order they were stored can lead to ineffective repairs. Disconnecting the battery or clearing codes without recording data can erase important diagnostic information.

View source

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

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