P0618 — Alternative-fuel control module KAM error

Keep-alive memory is reported faulty in the alternative-fuel control module. The code does not identify a particular alternative-fuel installation or prove a fuel-delivery fault. Verify which module implements this function in the vehicle before interpreting stored data.

Affected system: Control module self-diagnostics

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Fuel supply or pressure issue, restricted injector, actuator fault, connector or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Check fuel supply and pressure readings, electrical supply and ground, and the relevant injector or regulator circuit before replacing parts.
• Repair the verified cause and confirm the code does not return

Also written as: P0618-00, P061800, PO618 (some scan tools add the fault-type byte, e.g. -00).