This indicates a problem with the electrical circuit that monitors and controls the turbocharger. The voltage is higher than what the PCM (Powertrain Control Module) expects. Possible causes include:
* Faulty Turbocharger Boost Pressure Sensor: This sensor measures the boost pressure produced by the turbo. A faulty sensor might be sending incorrect, overly high voltage signals.
* Wiring Problems: A short circuit, open circuit, or corroded connection in the wiring harness leading to or from the turbo boost pressure sensor.
* Boost Pressure Sensor Circuit: A problem with the circuit itself, not necessarily the sensor. This might involve a damaged connector or a short.
* Turbocharger Wastegate Actuator Problem: A malfunctioning wastegate actuator can cause excessive boost pressure, leading to this code. It might be sticking open or failing to regulate the boost appropriately.
* Faulty PCM: In rare cases, the PCM itself could be the source of the problem, though this is less common than the other possibilities.
Troubleshooting Steps:
A mechanic will usually perform the following steps:
1. Check and clean connections: Inspect all wiring and connectors related to the turbo boost pressure sensor and the wastegate actuator for damage, corrosion, or loose connections.
2. Inspect the turbocharger boost pressure sensor: Test the sensor for proper operation using a scan tool or multimeter.
3. Test the wastegate actuator: Verify that the wastegate actuator is functioning correctly and responding appropriately to commands from the PCM.
4. Check for leaks in the boost system: Check all the hoses and pipes in the boost pressure system for leaks, as these can also cause higher than expected pressure readings.
5. Inspect the turbocharger itself: In some cases, the turbocharger may be faulty and causing excessive boost.
It's crucial to have this diagnosed and repaired by a qualified mechanic. Ignoring this code could lead to serious engine damage due to excessive boost pressure. Improperly diagnosing or repairing it could also result in further problems.
