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DTC Advanced Diagnostics: P0988
DTC P0988 : Transmission Fluid Pressure Sensor E Out of Range
General Description
Transmission fluid pressure sensor E is installed on the passage of the hydraulic pressure supplied to brake B2. The transmission control module (TCM) measures the hydraulic pressure of brake B2 from the output voltage of transmission fluid pressure sensor E. Transmission fluid pressure sensor E is a strain gauge that changes output voltage depending on the hydraulic pressure change supplied to brake B2. When the brake B2 hydraulic pressure is low, the TCM detects a low signal voltage. Conversely, when the brake B2 hydraulic pressure is high, the TCM detects a high signal voltage. It normally outputs at range of more than 0.286 V to less than 4.94 V depending on the hydraulic pressure. If the transmission fluid pressure sensor E output voltage is a specified range for a specified duration, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 3.0 seconds or more |
| DTC Type | Two drive cycles, MIL on, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery Voltage] | 10 V | - |
| Other | No abnormality in sensor supply (VCC3) | |
[ ]: HDS Parameter
Malfunction Threshold
One of these conditions is met for at least 3.0 seconds:
- The transmission fluid pressure sensor E output voltage is 0.247 V or more, or 0.286 V or less.
- The transmission fluid pressure sensor E output voltage is 4.94 V or more, or 4.951 V or less.
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.
- Valve body assembly failure (transmission fluid pressure sensor E)
- TCM internal circuit failure
Confirmation Procedure
Operating Condition
- Start the engine.
- While pressing the brake pedal, wait for several seconds in each of P position/mode and other than P position/mode.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the TCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on, the shift position indicator blinks, and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. 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, and the freeze data can be cleared with the scan tool clear command.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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