P0219-ENGINE OVERSPEED

For a complete wiring diagram Refer to Section 8W

Theory of Operation

The Transmission Control Module (TCM) monitors the engine speed over the CAN bus. If the engine speed is greater than a calibrated limit (see table), the TCM assumes that either the information from the Powertrain Control Module (PCM) is incorrect or that a major mechanical problem exist. Once the DTC is set, the TCM will position the transmission gear into neutral to protect the engine and transmission from damage. The transmission will remain in neutral and will not be revaluated by the TCM until the ignition is cycled.

When Monitored:
Continuously with the ignition on, engine running, with the transmission in gear with a valid Engine RPM message received at least once, and the CAN Bus Circuit and Engine CAN Message Missing are not active.
Set Condition:
Engine speed is greater than a calibrated limit (see table).

Engine Overspeed Limit
3.0 L (Diesel)	4350 + 800 rpm
3.5 L	6400 + 500 rpm
3.7 L	6000 + 500 rpm
4.0 L	6000 + 500 rpm
5.7 L	5600 + 500 rpm
6.1L	6200 + 500 rpm

Possible Causes

MECHANICAL ENGINE PROBLEM

MECHANICAL TRANSMISSION PROBLEM

POWERTRAIN CONTROL MODULE

TRANSMISSION CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)

Diagnostic Test

1. CHECK FOR OTHER TRANSMISSION DTCS

With the scan tool, check for other transmission DTCs.

Are there any gear ratio and/or speed sensor DTCs present in addition to P0219?

Yes

Refer to the Symptom Category and perform the appropriate symptom. If speed sensor DTCs are present, perform their respective test first.

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2. CHECK FOR ENGINE DTCS

With the scan tool, check for engine DTCs.

Are there any engine DTCs present?

Yes

Refer to the Symptom Category and perform the appropriate symptom.

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3. CHECK IF ENGINE MECHANICAL PROBLEMS ARE PRESENT

Determine if any Engine mechanical problems are present.

Are there any Engine mechanical problems present?

Yes

Repair engine as necessary. Refer to 9 - ENGINE-SERVICE INFORMATION for the appropriate repair procedures.

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4. CHECK IF TRANSMISSION MECHANICAL PROBLEMS ARE PRESENT

Determine if any Transmission mechanical problems are present.
Turn the ignition off to the lock position.
Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission Oil Filter. Refer to 21 - AUTOMATIC TRANSMISSION-AUTOMATIC TRANSMISSION NAG1/SERVICE INFORMATION for the appropriate service procedures.

Is there any debris, plugged Transmission Oil Filter, or signs of an internal transmission problem?

Yes

Repair Transmission as necessary. Refer to the Service Information and repair as necessary.

Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)

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5. TEST DRIVE VEHICLE

NOTE: The Engine and Transmission must not have mechanical problems and be operating normally before proceeding with this test.

Replace and program the Powertrain Control Module (PCM) per the Service Information. Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE for the appropriate service procedures.
Reassemble any previously disconnected connectors and/or components.
With the scan tool, erase Transmission DTCs.
Road test the vehicle.
With the scan tool, read Transmission DTCs.

Did DTC P0219-ENGINE OVERSPEED reset?

Yes

Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE for the appropriate service procedures.

Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)

Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)