DTC P0604, P0605 & P0613: INTERNAL TRANS CONTROLLER
Circuit Description
DTCs will set if an internal TCM malfunction occurs.

Possible Cause

Internal TCM failure.

NOTE: Ensure pre-diagnostic check has been performed before proceeding with following procedure. See PRE-DIAGNOSTIC CHECK .
Diagnostic Procedure
1.Record all DTCs and one trip failures. Using scan tool, erase DTCs.
TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM.
Turn ignition from off to on, then start engine.
Apply brakes. Slowly move gearshift lever through each gear position.
Check if DTC P0604, P0605 and/or P0613 has reset. If DTC P0604, P0605 and/or P0613 is present, replace TCM
After replacement, perform SHIFT QUALITY QUICK-LEARN PROCEDURE and PINION FACTOR PROCEDURE under PROGRAMMING. If DTC P0604, P0605 and/or P0613 is not present, go to next step.
2.Inspect the following for pushed out terminals or faulty connections and repair as necessary:
? Engine Ground Connections
? TCM Grounds
? TCM Battery Feed
? TCM Fused Ignition Switch Output Circuit
? Power Feed To Transmission Control Relay 3.If procedure in previous step fails to diagnose problem, erase DTCs using scan tool. Perform VER-1A: VERIFICATION TEST . If transaxle is still not functioning correctly, replace TCM.
See TRANSMISSION CONTROL MODULE under REMOVAL & INSTALLATION. After replacement, perform SHIFT QUALITY QUICK-LEARN PROCEDURE and PINION FACTOR PROCEDURE under PROGRAMMING. If transaxle is functioning correctly, test is complete.

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Answered by BMRFIXIT (expert)
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