P0219

P0219-ENGINE OVERSPEED

Theory of Operation
The Transmission Control Module (TCM) monitors the engine speed over the CAN bus. If the engine speed is greater than 4100+ 800 RPM, 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 5700 RPM + 500 RPM.

Possible Causes
- MECHANICAL ENGINE PROBLEM
- MECHANICAL TRANSMISSION PROBLEM
- POWERTRAIN CONTROL MODULE
- TRANSMISSION CONTROL MODULE

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Component Tests and General Diagnostics

Diagnostic Test
1. CHECK FOR OTHER TRANSMISSION DTC's
With the scan tool, check for other transmission DTC's.
Are there any gear ratio and/or speed sensor DTC's present in addition to P0219?
YES >>Refer to Computer and Control Systems and perform the appropriate diagnostic procedure. If speed sensor DTC's are present, perform their respective test first.
NO >> Go To 2

2. 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.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >> Go To 3

3. 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 excessive debris or a plugged Transmission Oil Filter.
Is there any debris, plugged Transmission Oil Filter, or signs of an internal transmission problem?
YES >>Repair Transmission as necessary .Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >>Go To 4

4. 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).
Reassemble any previously disconnected connectors and/or components. With the scan tool, erase Transmission DTC's. Road test the vehicle. With the scan tool, read Transmission DTC's.
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.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test
NO >>Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test