P0219-ENGINE OVERSPEED
For a complete wiring diagram, refer to the Wiring Information.
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.
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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.
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Set Condition:
Engine speed is greater than a calibrated limit (see table).
Possible Causes |
|---|
| MECHANICAL ENGINE PROBLEM |
| MECHANICAL TRANSMISSION PROBLEM |
| POWERTRAIN CONTROL MODULE (PCM) |
| TRANSMISSION CONTROL MODULE (TCM) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
Engine Overspeed Limit (If Equipped) |
|
|---|---|
| 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 |
1. CHECK FOR OTHER TRANSMISSION DTCS
| 1. | 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 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Diagnosis and Testing) and perform the appropriate symptom. If speed sensor DTCs are present, perform their respective test first.
No
- Go To 2
| 1. | With the scan tool, check for PCM DTCs. |
Are there any PCM DTCs present?
Yes
- (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.
No
- Go To 3
3. CHECK IF ENGINE MECHANICAL PROBLEMS ARE PRESENT
| 1. | Determine if any Engine mechanical problems are present. |
Are there any Engine mechanical problems present?
Yes
- Repair engine as necessary.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
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 excessuve debris or a plugged Transmission Oil Filter. (Refer to 21 - Transmission and Transfer Case/Automatic - NAG1/FLUID and FILTER - Standard Procedure) . |
Is there any debris, plugged Transmission Oil Filter, or signs of an internal transmission problem?
Yes
- Repair Transmission as necessary.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
- Go To 5
| NOTE: | The Engine and Transmission must not have mechanical problems and be operating normally before proceeding with this test. |
| 1. | Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE (PCM) for the appropriate service procedures. |
| 2. | Reassemble any previously disconnected connectors and/or components. |
| 3. | With the scan tool, erase Transmission DTCs. |
| 4. | Road test the vehicle. |
| 5. | 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 in accordance with the Service Information.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
- Test Complete
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).