Transmission Control Module (TCM) - 8HP45

P0219-ENGINE OVERSPEED

For a complete wiring diagram Refer to the Wiring Information.

Theory of Operation

The purpose of the diagnostic is to detect an engine overspeed using two different methods. First, the actual engine speed received via CAN is compared to a maximum allowable engine speed threshold. Second, when a gear shift request occurs, the calculated input speed of the target gear is compared to the maximum allowable engine speed threshold.

- When Monitored:
In Fixed Gear

Gear position must be in Drive or Reverse.

Not in 7th or 8th gear while in the low range mode.

At a Gear Shift Request

Gear position must be in Drive or Reverse.

- Set Condition:
In Fixed Gear

The failure is detected if the engine speed is greater than a threshold for a calibrated amount of time.

At a Gear Shift Request

The failure is detected if the calculated input speed of the target gear, i.e. the actual output speed, target gear ratio, is greater than a calibrated threshold for a calibrated amount of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. 8HP45 Pre-Diagnostic Troubleshooting Procedure

1. CHECK FOR OTHER TRANSMISSION DTCS
1. With the scan tool, check for other transmission DTCs.

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

Yes

- Diagnose and repair the DTC(S). If gear ratio or speed sensor DTCs are present, perform their respective test first.

No

- Go To 2

2. CHECK FOR ENGINE DTCS
1. With the scan tool, check for engine DTCs.

Are any engine DTCs present?

Yes

- Testing and Inspection.

No

- Go To 3

3. CHECK IF ENGINE MECHANICAL PROBLEMS ARE PRESENT
1. Determine if any Engine mechanical problems are present.

Are any Engine mechanical problems present?

Yes

- Repair engine as necessary. Refer to 9 - ENGINE-SERVICE INFORMATION for the appropriate repair procedures.
- Perform TRANSMISSION VERIFICATION TEST. Verification Tests

No

- Go To 4

4. CHECK IF TRANSMISSION MECHANICAL PROBLEMS ARE PRESENT
1. Determine if any Transmission mechanical problems are present.
2. Turn the ignition OFF to the LOCK position.
3. 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 TRANSMISSION VERIFICATION TEST. Verification Tests

No

- Go To 5

5. TEST DRIVE THE VEHICLE

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

1. With the scan tool, erase Transmission DTCs.
2. Road test the vehicle.
3. 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 A (TCMA) terminals and connectors for corrosion, damage or terminal push out. Pay particular attention to the power and ground circuits. If no problems are found, replace and program the TCMA.
- Perform TRANSMISSION VERIFICATION TEST. Verification Tests

No

- Test Complete
- Perform TRANSMISSION VERIFICATION TEST. Verification Tests