The P1219 diagnostic trouble code is a manufacturer-specific powertrain code. Its exact definition depends heavily on the vehicle make, pointing to a Cylinder Identification circuit fault or a Throttle Position Sensor reference voltage issue.
Because this code targets entirely different systems across manufacturers, the exact vehicle application must be verified before diagnosis. The code alone does not prove a specific component has failed without proper testing.
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Key Takeaways
- P1219 is a manufacturer-specific powertrain code with differing definitions depending on the vehicle make.
- On Ford and Lincoln diesel applications, it indicates a Cylinder Identification (CID) circuit stuck low or shorted to ground.
- On GM and Honda applications, it points to a Throttle Position Sensor (TPS) reference voltage fault.
- Diagnosis requires verifying the exact factory definition and testing the relevant injector driver, camshaft position, or throttle position circuit.
- Repairs depend on the confirmed root cause and may involve repairing wiring harnesses or replacing a confirmed failed module or sensor.
P1219 Code Description and Implications
The P1219 code indicates that a control module has detected a specific fault within the fuel injection or throttle control systems. Because it is a manufacturer-specific code, the exact monitored component varies significantly by brand.
Some Ford and Lincoln diesel applications: P1219 indicates a Cylinder Identification (CID) circuit stuck low. The PCM detects that the CID signal circuit between the PCM and the Injector Driver Module (IDM) is shorted to ground.
Certain GM and Honda applications: The code indicates a Throttle Position Sensor Reference Voltage fault. The ECM detects an inappropriate voltage level in the 5-volt reference signal supplied to the TPS.
Common Causes of the P1219 Code
Because P1219 applies to different systems across different brands, the root cause depends on the verified vehicle application.
Ford and Lincoln Diesel Causes: A short to ground in the CID wiring harness, a faulty Injector Driver Module (IDM), or a failing Camshaft Position Sensor (CMP/CID).
GM and Honda Causes: A faulty Throttle Position Sensor, damaged 5-volt reference wiring, or poor electrical connections at the TPS connector causing a voltage drop.
Symptoms Associated With P1219
When the control module detects a critical system fault, it illuminates a warning light and may alter vehicle operation.
Warning Lights: The Check Engine Light will illuminate. On diesel applications, a Wait to Start or glow plug light may also flash.
Drivability: On Ford diesel applications, a crank no-start condition, engine stalling, or severe misfires may occur. On GM and Honda applications, reduced engine power, limp mode activation, or poor acceleration are possible.
Diagnosing the P1219 Trouble Code
Accurate diagnosis begins by verifying the exact vehicle application and reviewing manufacturer-specific service information.
For Ford and Lincoln diesel applications: Inspect the wiring harness between the PCM and IDM for chafing or shorts to ground. Test the CID circuit continuity and verify the IDM and CMP operation.
For GM and Honda applications: Verify the 5-volt reference signal at the TPS connector using a multimeter. Inspect the sensor and wiring for shorts, opens, or excessive resistance.
Repairing the P1219 Issue
Repairs must follow the confirmed root cause identified during diagnosis.
Injection and Sensor Circuit Repairs: Repair any damaged wiring or corroded connectors found during diagnosis. If the circuit tests properly but the fault persists, replace the confirmed failed IDM, CMP, or TPS according to manufacturer procedures.
Cost Considerations for P1219 Repairs
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Replacing an external throttle position sensor involves minimal labor. However, diagnosing complex wiring shorts between the PCM and IDM on diesel engines requires significant diagnostic time and specialized electrical testing equipment.
Prevention Strategies for Future Occurrences
Inspecting exposed wiring harnesses, especially near the engine block and valve covers, can help identify developing chafing that leads to short-to-ground faults on diesel applications.
Keeping throttle body electrical connectors clean and secure helps prevent moisture intrusion and poor electrical connections in the TPS reference circuit.
Troubleshooting Tips and Best Practices
Follow these practices to avoid misdiagnosis and ensure accurate repairs.
Do not assume the IDM or PCM is dead on Ford applications: A bare wire shorting to ground is a frequent cause of this fault. Always verify circuit integrity before considering module replacement.
Check for related codes: Look for accompanying camshaft position or injector circuit codes, which might help pinpoint a broader wiring harness issue.
Verify your definition: When researching this fault code, always confirm whether your specific vehicle uses the CID or TPS definition before ordering parts.
More OBD-II Codes
| P1215 | P1216 | P1217 | P1218 |
| P1220 | P1221 | P1222 | P1223 |
| P1224 | P1225 | P1226 | P1227 |
| P1228 | P1231 | P1234 | P1237 |
| P1240 | P1243 | P1244 | P1245 |
| P1250 | P1286 | P1287 | P1288 |
Frequently Asked Questions
Is P1219 a generic or manufacturer-specific code?
No. P1219 is a manufacturer-specific powertrain code. Its definition varies significantly by brand, indicating a cylinder identification circuit fault or a throttle position sensor reference voltage issue.
Can I drive my vehicle with a P1219 code?
The vehicle may not start or may stall unexpectedly on diesel applications. On throttle position applications, severe power reduction and limp mode make driving unsafe until repaired.
Will disconnecting the battery clear the P1219 code?
Disconnecting the battery might temporarily clear the code. However, it does not repair the underlying shorted wire, failed module, or faulty sensor, and the code will return upon the next monitor cycle.
Can a bad camshaft position sensor cause a P1219 code?
Yes. On Ford diesel applications where P1219 indicates a cylinder identification circuit fault, a failing camshaft position sensor (often called the CID sensor) is a potential cause of the code.
Does P1219 affect the transmission?
No. The P1219 code relates strictly to the engine fuel injection control, injector driver module, or throttle position sensor circuit. It does not directly affect the automatic or manual transmission operation.
What Should You Do About the P1219 Code?
When a P1219 code appears, confirm the exact factory definition for your specific vehicle make and model. Because this code targets entirely different fuel injection and throttle systems depending on the manufacturer, applying the wrong diagnostic path will lead to misdiagnosis.
Follow the applicable manufacturer diagnostic procedure to test the relevant system and components. Once the root cause is confirmed, complete the necessary electrical repairs, component replacements, or module corrections before returning the vehicle to normal service.
