What does P1640 mean on a Ford?

P1640. Powertrain DTCs Available in Another Module. Applies to All OBD-II Ford vehicles with networked modules.

What causes P1640 on a Ford?

Fault codes stored in the TCM, ABS or instrument cluster Networked module reporting a powertrain fault Intermittent network dropout flagging the notice Recently cleared PCM with module codes remaining Failing module spamming the network

How do I fix P1640 on a Ford?

Scan every module, not just the PCM Diagnose the codes found in the other module Check network communication health Clear all modules after repair Verify the notice does not return

Code

P1640

Powertrain DTCs Available in Another Module

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: All OBD-II Ford vehicles with networked modules
Related: P0600 Serial Communication Link Malfunction on OBD Codes List

Findings, check these first

Fault codes stored in the TCM, ABS or instrument cluster
Networked module reporting a powertrain fault
Intermittent network dropout flagging the notice
Recently cleared PCM with module codes remaining
Failing module spamming the network

Standard procedure

Scan every module, not just the PCM
Diagnose the codes found in the other module
Check network communication health
Clear all modules after repair
Verify the notice does not return

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: qualified. Read the source limits below.

OBDII.pro: P1640 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1640: Powertrain DTCs Available in Another Module
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-06.

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