DTC P0606: CONTROLLER INTERNAL PERFORMANCE (2001) Chevrolet Silverado 2500

Note. For circuit identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

Circuit Description

The Transmission Control Module (TCM) completes numerous scheduled tasks during normal operation. If one of the scheduled tasks fails to complete within a specific time limit, the TCM will re-attempt this task. The presence of DTC P0606 indicates a TCM software error has occurred, and your GM Dealer Network Service Department should be contacted.

This is a type "B" DTC.

Conditions For Running The DTC

DTC will run under the following condition

1. This test is run during the entire ignition cycle.

Conditions For Setting The DTC

DTC will set under the following condition

1. DTC sets if a task fails to complete after two consecutive attempts.

Action Taken When The DTC Sets

TCM performs the following actions if DTC is set

1. When the failure is active, the transmission locks in Neutral. The transmission will have limited operating ability.
2. Illuminates the MIL when active.
3. The TCM freezes shift adapts.
4. TCM inhibits TCC engagement.

Conditions For Clearing The DTC

DTC will clear under the following conditions

1. A scan tool can be used to clear the DTC from the TCM history.
2. The TCM automatically clears the DTC from the TCM history.

DTC is set by the engine PCM. DTC P0700 allows a technician to be alerted from the engine diagnostic side that the TCM is setting a DTC and is requesting the MIL. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.