DTC Advanced Diagnostics: P0089 (2.0L Engine) (2024 2025)
DTC P0089 : Fuel Pressure Regulator Performance
General Description
The high pressure fuel system consists of a fuel rail, a fuel rail pressure sensor, a high pressure fuel pump with a built-in fuel control solenoid. In dependence of torque demand and engine speed, high pressure has to be adjusted. Therefore the fuel pressure in the rail is measured and controlled with help of the fuel control solenoid. If the difference between the desired and measured fuel rail pressure is too large, combustion and emissions can be influenced. The powertrain control module (PCM) monitors the high pressure fuel control system. The diagnosis checks the plausibility of the high pressure controller output if the activation of the fuel control solenoid extremely deviates from the pre-control. If the pressure deviation at controller output is a specified value, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 7.5 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time after starting the engine | 5 seconds | - |
| Relative fuel mass quantity* 1 | 5.02 % | 320.02 % |
| Relative fuel mass quantity* 2 | 5.02 % | 190.031 - 250.031%* |
| Other | High pressure regulation not reset | |
*: Depending on engine speed.
*1: USA/Canada models
*2: Mexico models
Malfunction Threshold
Either of the conditions occurs for at least 7.5 seconds:
- The positive pressure deviation at controller output is greater than 2, 300 kPa (23.5 kgf/cm 2, 334 psi).
- The negative pressure deviation at controller output is less than -2, 300 kPa (-23.5 kgf/cm 2, -334 psi).
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes
- High pressure fuel pump failure (pressure relief valve defection)
- Fuel pump low flow
- High pressure fuel pipe leakage
- Fuel injector contamination
- Fuel rail pressure sensor drifting
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.